The Lewis-Clark Valley AVA — Idaho's River Canyon Wine Country at the Confluence of Two Great Rivers

Stand at the confluence of the Clearwater and Snake Rivers at Lewiston, Idaho, and you are standing at one of the most historically significant spots in the American West. This is where Meriwether Lewis and William Clark camped in October 1805, where the Corps of Discovery built dugout canoes from the ponderosa pines of the surrounding hills and launched themselves onto the river system that would carry them to the Pacific Ocean. It is where the Nez Perce people had fished and traded and lived for thousands of years before European contact, where the fur trade established its first inland foothold in the Pacific Northwest, and where the rivers carved through the ancient basalt of the Columbia Plateau to create one of the most dramatic canyon landscapes in the American West.

It is also, improbably, wine country.

The Lewis-Clark Valley AVA — established in 2016, making it one of the newer federally recognized appellations in the United States — encompasses approximately 965 square miles of river canyon country straddling the Idaho-Washington border, centered on the twin cities of Lewiston, Idaho, and Clarkston, Washington, at the confluence of the Clearwater and Snake Rivers. The appellation extends up the Clearwater River drainage into the heart of north-central Idaho and down the Snake River canyon toward the dramatic gorge of Hells Canyon, the deepest river gorge in North America.

It is a wine region that defies easy categorization. The Lewis-Clark Valley is not the high-desert viticulture of the Snake River Valley AVA to the south, with its volcanic bench sites and continental climate. It is not the maritime-influenced cool-climate wine country of the Willamette Valley to the west. It is something genuinely different — a river canyon wine region where the deep gorges of the Snake and Clearwater Rivers create a sheltered, surprisingly warm growing environment within the walls of the basalt canyon, and where the combination of ancient volcanic soils, intense sunshine, and the moderating influence of the rivers produces wines with a character that is unique to this specific geography.

The Lewis-Clark Valley AVA is defined by its river canyons — the deep, steep-walled gorges carved by the Snake and Clearwater Rivers through the Columbia River Basalt, the vast volcanic plateau that underlies much of the inland Pacific Northwest. The canyon walls rise 1,000 to 2,000 feet above the river floors, creating a sheltered growing environment that is dramatically warmer and drier than the surrounding plateau country above.

The Snake River canyon in the Lewis-Clark Valley section is a precursor to the even more dramatic Hells Canyon to the south — the deepest river gorge in North America, where the Snake River cuts more than 7,900 feet below the surrounding rim. The canyon walls in the Lewis-Clark Valley section are less extreme but no less dramatic, rising in stepped basalt terraces from the river to the plateau above, with the vineyard sites concentrated on the lower terraces and benches where the combination of south-facing orientation, basalt soils, and canyon-sheltered warmth creates the most favorable growing conditions.

The Clearwater River canyon — running east from the confluence at Lewiston into the heart of the Clearwater Mountains — is a different landscape from the Snake River canyon: narrower, more forested, and with a cooler, more humid microclimate in its upper reaches that transitions to the warmer, drier conditions of the lower canyon near the confluence. The vineyard sites along the Clearwater are concentrated in the lower canyon, where the river's moderating influence and the south-facing basalt terraces create growing conditions similar to those of the Snake River sites.

The Lewiston Orchards bench — a broad, flat terrace above the confluence of the two rivers, at elevations between 1,400 and 1,800 feet — is the most important agricultural area in the Lewis-Clark Valley and the location of several of the most significant vineyard sites in the AVA. The bench was formed by the same catastrophic Missoula Floods that shaped much of the Columbia River drainage system at the end of the last Ice Age, when the repeated release of glacial Lake Missoula sent walls of water roaring down the river system and deposited the deep, fertile soils of the Lewiston bench. The combination of the flood-deposited soils, the south-facing orientation of the bench, and the sheltered warmth of the canyon environment creates growing conditions that are among the most favorable in the entire Lewis-Clark Valley AVA.

The Asotin County area of Washington State — the western portion of the AVA, along the Snake River south of Clarkston — is the other major vineyard concentration in the appellation, with a slightly warmer and drier microclimate than the Idaho sites that favors the later-ripening red varieties. The basalt soils here are thinner and more mineral-rich than the deeper flood-deposited soils of the Lewiston bench, and the wines grown on them have a more austere, mineral character that distinguishes them from the rounder, more approachable examples from the bench sites.

The climate of the Lewis-Clark Valley AVA is the most surprising feature of the region — and the key to understanding why wine grapes grow here at all. The canyon environment creates a growing climate that is dramatically warmer than the surrounding plateau country, and that is more similar to the wine regions of eastern Washington than to the cool, maritime-influenced climate that most people associate with northern Idaho.

The canyon walls act as a natural heat trap, absorbing solar radiation during the day and radiating it back to the vines at night, moderating the temperature swings that characterize the more exposed plateau sites above. The Snake and Clearwater Rivers themselves act as thermal regulators, storing heat during the summer and releasing it slowly through the autumn, extending the growing season and allowing the grapes to achieve full phenolic maturity before the first killing frosts arrive.

Summer temperatures in the Lewis-Clark Valley regularly reach 95 to 100°F — comparable to the warmest sites in the Columbia Valley and significantly warmer than the Snake River Valley AVA to the south. The canyon orientation channels warm air from the south and west, creating a growing environment that is genuinely hot by Pacific Northwest standards. But the nights cool significantly — to 55 to 60°F in the warmest months — creating a diurnal temperature swing of 35 to 45 degrees that preserves the natural acidity and the aromatic complexity of the wines.

Annual precipitation in the Lewis-Clark Valley averages 12 to 14 inches — slightly more than the Snake River Valley but still well below the threshold that would support viticulture without irrigation. The low humidity and the abundant sunshine — the canyon orientation maximizes sun exposure for the south-facing vineyard sites — create conditions that are highly favorable for grape growing: disease pressure is minimal, the fruit ripens evenly and cleanly, and the dry harvest season allows the grapes to hang on the vine well into October without the risk of rot that plagues the wetter wine regions of the Pacific Northwest.

The growing season in the Lewis-Clark Valley runs from approximately late March or early April — significantly earlier than the Snake River Valley, thanks to the canyon's sheltered warmth — to late October or early November, a window of 180 to 200 days that is long enough to ripen even the later-ripening Cabernet Sauvignon and Syrah varieties in favorable years. This extended growing season is one of the most significant advantages of the Lewis-Clark Valley's canyon climate, and it allows the region to produce a wider range of varieties than the shorter-season Snake River Valley to the south.

The winter cold is less severe in the Lewis-Clark Valley than in the Snake River Valley, thanks to the moderating influence of the canyon environment and the rivers. Temperatures rarely drop below -5°F in the canyon bottom, compared to the -10 to -15°F lows that are common in the more exposed Treasure Valley sites. This relative winter mildness allows the classic European varieties — including Cabernet Sauvignon and Syrah — to be grown with less risk of winter injury than in the more continental climate of the southern AVA.

The geological story of the Lewis-Clark Valley AVA is one of the most dramatic in American wine country — a record of volcanic eruptions, catastrophic floods, and the slow work of the rivers that has produced a mosaic of soil types that is the foundation of the region's wine identity.

The dominant parent material throughout the Lewis-Clark Valley is Columbia River Basalt — the vast volcanic formation that underlies the entire Columbia Plateau and that was deposited by a series of massive lava flows between 6 and 17 million years ago. The basalt of the Lewis-Clark Valley is among the oldest and most deeply weathered in the Columbia Plateau system, and the soils derived from it are thin, mineral-rich, and exceptionally well-drained — the classic volcanic wine soils that produce wines of concentration and mineral complexity.

The basalt soils of the canyon walls and lower terraces are the most distinctive in the AVA: dark, iron-rich, and intensely mineral, with a low organic matter content and a drainage capacity that stresses the vines in ways that concentrate the fruit and deepen the character of the wines. The mineral quality of the basalt soils is reflected directly in the wines grown on them — a volcanic, almost smoky mineral note that is the signature of the best Lewis-Clark Valley wines and that distinguishes them from the wines of the Willamette Valley and the warmer Columbia Valley sites to the west and north.

The Missoula Flood deposits — the deep, fertile soils left by the repeated catastrophic releases of glacial Lake Missoula at the end of the last Ice Age — cover the Lewiston bench and the lower terraces of the canyon, creating a more fertile and deeper soil profile than the pure basalt sites of the canyon walls. The flood deposits include a mix of fine silt, sand, and gravel that creates a well-drained but more moisture-retentive soil than the thin basalt soils above, and the wines grown on these sites tend to be rounder and more approachable than the more austere examples from the pure volcanic sites.

The loess — wind-deposited silt from the surrounding plateau — covers much of the benchland above the canyon, creating the deep, fertile agricultural soils that have made the Palouse country of eastern Washington and northern Idaho one of the most productive wheat-farming regions in the world. The loess soils are less well-suited to viticulture than the basalt and flood-deposit sites of the canyon, but they are present in several of the vineyard sites on the upper benches and contribute a softness and a roundness to the wines grown on them.

The Lewis-Clark Valley has a human history that stretches back more than 10,000 years — a history that is inseparable from the rivers that define the landscape and that has shaped the cultural identity of the region in ways that are still visible in the wine country today.

The Nez Perce people — the Niimíipuu, "the real people" — have lived in the river canyon country of the Lewis-Clark Valley for thousands of years, fishing the Clearwater and Snake Rivers for the salmon that were the foundation of their culture and economy, and trading with the peoples of the Columbia Plateau and the Great Plains across a network of trails that crossed the mountains and canyons of the inland Pacific Northwest. The Nez Perce were the first people Lewis and Clark encountered after crossing the Bitterroot Mountains in September 1805, and the assistance the tribe provided to the starving, exhausted Corps of Discovery — food, horses, and guidance through the river system — was essential to the success of the expedition.

The Lewis and Clark Expedition camped at the confluence of the Clearwater and Snake Rivers in October 1805, building dugout canoes from the ponderosa pines of the surrounding hills and launching themselves onto the river system that would carry them to the Pacific Ocean. The expedition's journals describe the landscape of the Lewis-Clark Valley in terms that are still recognizable today — the dramatic canyon walls, the clear, cold rivers, the abundance of salmon, and the warm, dry climate of the canyon bottom that was such a contrast to the cold, wet mountains they had just crossed.

The modern wine industry in the Lewis-Clark Valley is a recent phenomenon — the first commercial vineyards were planted in the 1980s and 1990s, and the AVA was not established until 2016. But the region's agricultural heritage is much older: the Lewiston bench has been farmed continuously since the 1860s, when the first Euro-American settlers arrived in the canyon country and established the orchards and grain farms that still define much of the agricultural landscape. The combination of the warm canyon climate, the fertile flood-deposit soils, and the reliable irrigation water from the rivers made the Lewiston bench one of the most productive agricultural areas in northern Idaho, and the transition to viticulture in the late 20th century was a natural extension of that agricultural tradition.

The establishment of the Lewis-Clark Valley AVA in 2016 was a significant milestone for the region's wine industry — a recognition by the federal government that the Lewis-Clark Valley's distinctive terroir and growing conditions set it apart from the broader Columbia Valley and Snake River Valley appellations and that it deserved its own identity in the American wine landscape. The AVA is one of the few in the United States to straddle a state border, encompassing vineyard sites in both Idaho and Washington, and the cross-border character of the appellation reflects the geographical reality of the river canyon landscape, which pays no attention to the political boundary between the two states.

The grape varieties grown in the Lewis-Clark Valley AVA reflect the realities of the canyon climate — a long, warm growing season with intense sunshine, moderate diurnal temperature swings, and the relative winter mildness that allows a wider range of varieties than the more continental Snake River Valley to the south. The producers who have succeeded in the Lewis-Clark Valley have built their wine programs around the varieties that perform best in the canyon's specific growing conditions, and the results are wines of genuine character that reflect the specific terroir of the river canyon landscape.

Syrah has emerged as the signature red variety of the Lewis-Clark Valley AVA — a variety that finds in the canyon's warm days, cool nights, and ancient basalt soils a growing environment that is ideally suited to its character. The best Lewis-Clark Valley Syrabs have the dark fruit, black pepper, smoked meat, and floral lift that makes the variety so compelling in the northern Rhône and in the best Washington State examples, amplified by the mineral quality of the basalt soils and the freshness of the canyon nights. The combination of the canyon's warmth — which drives the phenolic ripeness that gives Syrah its depth and structure — and the cool nights that preserve the aromatic complexity and the natural acidity produces wines that are genuinely distinctive and that reward comparison with the finest Syrabs in the Pacific Northwest portfolio.

Cabernet Franc performs exceptionally well in the Lewis-Clark Valley, benefiting from the canyon's extended growing season and the mineral character of the basalt soils. The variety's aromatic precision — red currant, dried herb, graphite, and a distinctive floral lift — is amplified by the volcanic soils and the cool nights of the canyon, and the best Lewis-Clark Valley Cabernet Francs have a savory, mineral quality that distinguishes them from the richer, more fruit-forward examples from warmer growing environments. The extended growing season of the canyon climate allows the variety to achieve full phenolic maturity without losing the freshness and the aromatic complexity that make it so compelling.

Cabernet Sauvignon is grown successfully in the Lewis-Clark Valley thanks to the canyon's extended growing season and relative winter mildness — conditions that allow the late-ripening variety to achieve full maturity in most years without the winter injury risk that limits its cultivation in the more continental Snake River Valley. The best Lewis-Clark Valley Cabernet Sauvignons are dark, structured, and genuinely complex, with a depth and a mineral quality that reflects the volcanic basalt soils of the canyon sites.

Merlot is the most widely planted red variety in the Lewis-Clark Valley, producing wines that range from soft and approachable at the deeper flood-deposit soil sites to more structured and mineral at the thin basalt locations. The variety's adaptability and its relatively early ripening make it one of the most reliable red varieties in the canyon climate, and the best Lewis-Clark Valley Merlots have a dark fruit, chocolate, and mineral character that is genuinely food-friendly.

Chardonnay leads the white program in the Lewis-Clark Valley, producing wines that reflect the canyon's combination of warmth and cool nights in a style that is richer and more textured than the high-altitude Snake River Valley examples but fresher and more mineral than the warmer Columbia Valley sites. The best Lewis-Clark Valley Chardonnays are made in a style that balances the richness of the warm canyon days with the freshness of the cool nights — wines of genuine complexity and food-friendliness that reward the table as much as the tasting room.

Riesling performs well in the cooler, higher-elevation sites of the AVA, particularly along the upper Clearwater River drainage where the canyon narrows and the temperatures moderate. The variety's high natural acidity and aromatic complexity make it well-suited to the canyon climate, and the best Lewis-Clark Valley Rieslings have a lime, green apple, and floral character with a mineral quality that reflects the basalt soils of the upper canyon sites.

Viognier has found a natural home in the warm canyon climate of the Lewis-Clark Valley, producing wines with the apricot, peach, and floral character that makes the variety so distinctive in the northern Rhône. The canyon's warmth drives the richness and the aromatic intensity that Viognier needs to express itself fully, while the cool nights preserve the freshness and the food-friendliness that distinguish the best examples from the overripe, flabby Viogniers that the variety can produce in genuinely hot growing environments.

Tempranillo is one of the most interesting varieties in the Lewis-Clark Valley portfolio — a Spanish variety that has found an unexpectedly natural home in the canyon's warm, dry growing conditions. The variety's ability to retain acidity in warm growing conditions, its aromatic complexity, and its affinity for the volcanic basalt soils of the canyon sites have produced wines of genuine character that connect the Lewis-Clark Valley to the broader Pacific Northwest tradition of working with Spanish varieties in high-desert and canyon growing environments.

The Lewis-Clark Valley wine industry is small by national standards — fewer than twenty licensed producers operate within the AVA — but the commitment and the quality of the best producers are genuine, and the wines they are making from the canyon's distinctive terroir deserve far more attention than they currently receive.

Clearwater Canyon Cellars is the most celebrated producer in the Lewis-Clark Valley AVA and the winery that has done more than any other to establish the region's national reputation. Founded in 2004 by Karl and Coco Umiker, the winery sources fruit from estate vineyards and from carefully selected growers throughout the Lewis-Clark Valley, making wines that reflect the specific character of the canyon terroir with a clarity and a precision that is genuinely impressive.

The Syrah at Clearwater Canyon Cellars is the flagship wine — a dark, structured, genuinely complex expression of the variety that has attracted national attention and that rewards comparison with the finest Syrabs from Washington State and the northern Rhône. The wine's combination of black pepper, smoked meat, dark fruit, and a distinctive floral lift with the mineral quality of the Lewis-Clark Valley basalt soils makes it one of the most distinctive red wines produced in Idaho. The Cabernet Franc is equally impressive: aromatic and structured, with a red currant, dried herb, and graphite character and a mineral precision that is the hallmark of the best canyon-grown reds.

The Chardonnay at Clearwater Canyon Cellars is the most compelling white wine in the Lewis-Clark Valley portfolio — a rich, textured expression of the variety that balances the warmth of the canyon climate with the freshness of the cool nights and the mineral character of the basalt soils. It is a wine that rewards comparison with the finest Chardonnays from the Columbia Valley and that demonstrates the Lewis-Clark Valley's potential for producing serious white wines alongside its celebrated reds.

Karl Umiker's commitment to the Lewis-Clark Valley terroir — and to the idea that the canyon's distinctive growing conditions can produce wines of genuine national significance — has made Clearwater Canyon Cellars the standard-bearer for the region's wine industry. The winery's tasting room in Lewiston is one of the most welcoming wine destinations in northern Idaho, and a visit is an essential part of any Lewis-Clark Valley wine itinerary.

Colter's Creek Winery — named for John Colter, the member of the Lewis and Clark Expedition who became the first Euro-American to explore the Yellowstone country — is one of the most historically evocative wine destinations in the Lewis-Clark Valley AVA. Founded by Mike and Melissa Pearson, the winery produces a range of wines from estate-grown and purchased Lewis-Clark Valley fruit that reflects the diversity of the canyon's growing environments.

The Syrah at Colter's Creek is the flagship red — dark, peppery, and structured, with a smoked meat and dark fruit character and a mineral quality that reflects the volcanic basalt soils of the canyon sites. The Viognier is the flagship white: richly aromatic, with an apricot, peach, and floral character and a freshness and a food-friendliness that makes it one of the most distinctive white wines produced in the Lewis-Clark Valley. The Tempranillo, made from canyon-grown fruit, is equally impressive: dark, structured, and genuinely complex, with a depth and a savory mineral quality that distinguishes it from the warmer-climate Spanish examples.

Colter's Creek maintains a tasting room in the historic downtown of Moscow, Idaho — the university town at the edge of the Palouse country, 30 miles north of Lewiston — that has become one of the most popular wine destinations in the region. The combination of the historic downtown setting, the quality of the wines, and the winery's commitment to the Lewis-Clark Valley terroir has made Colter's Creek a genuine community institution in the Moscow-Lewiston corridor.

Camas Prairie Winery in Moscow is one of the oldest continuously operating wineries in the Lewis-Clark Valley region — a small family operation that has been producing wine from Idaho-grown fruit since 1987 and that has built its reputation on the quality of its estate-grown grapes and the consistency of its winemaking. The winery was founded by Stuart and Susan Scott, who recognized the potential of the Lewis-Clark Valley's canyon climate and volcanic soils for producing wines of genuine character at a time when the Idaho wine industry was still in its infancy.

The Helles Lager — wait, wrong beverage. The Cabernet Franc at Camas Prairie is the flagship red: aromatic and structured, with a red fruit and dried herb character and a mineral quality that reflects the volcanic basalt soils of the canyon sites. The Riesling, made from fruit grown in the cooler upper canyon sites, is the flagship white: lean, mineral, and laser-sharp, with a lime and green apple character and a food-friendliness that makes it one of the most versatile white wines produced in the Lewis-Clark Valley.

The winery's long history in the region — nearly four decades of continuous operation — has given it a depth of knowledge about the Lewis-Clark Valley's growing conditions and a collection of older vintages that provides a unique window into the evolution of the region's wine identity over time. A visit to Camas Prairie is as much a historical experience as a wine experience, and it is one of the most rewarding stops on any Lewis-Clark Valley wine itinerary.

Merry Cellars — based in Pullman, Washington, at the edge of the Palouse country just north of the Lewis-Clark Valley AVA — is one of the most respected producers in the region, sourcing fruit from carefully selected vineyard sites throughout the Lewis-Clark Valley and the broader Columbia Valley and making wines that reflect the specific character of each growing environment. The winery was founded by Patrick and Merry Merry, and it has built its reputation on the quality of its single-vineyard and single-AVA wines and the transparency of its sourcing and winemaking.

The Syrah at Merry Cellars is the flagship wine — a dark, structured, genuinely complex expression of the variety that has attracted national attention and that rewards comparison with the finest Syrabs from the Lewis-Clark Valley and the Columbia Valley. The Cabernet Franc is equally impressive: aromatic and structured, with a red currant, dried herb, and graphite character and a mineral precision that reflects the volcanic basalt soils of the canyon sites. The Chardonnay, made from Lewis-Clark Valley fruit, is one of the most food-friendly white wines produced in the region — lean, mineral, and genuinely versatile.

Aspen Ridge Cellars in Clarkston, Washington — on the Washington State side of the Lewis-Clark Valley AVA, at the confluence of the Snake and Clearwater Rivers — is one of the most scenically situated wineries in the region, with a tasting room that offers panoramic views of the river confluence and the surrounding canyon country. The winery produces a range of wines from Lewis-Clark Valley and Columbia Valley fruit, with a particular focus on the red varieties that perform best in the warm canyon growing conditions.

The Merlot at Aspen Ridge is the flagship wine — dark, velvety, and structured, with a depth and a complexity that reflects the quality of the canyon-grown fruit and a mineral quality that distinguishes it from the softer, more commercial Merlots of the warmer Columbia Valley sites. The Cabernet Sauvignon, made from canyon-grown fruit, is equally impressive: dark, structured, and genuinely complex, with a depth that rewards cellaring and that demonstrates the Lewis-Clark Valley's potential for producing serious Bordeaux-variety reds.

The Lewis-Clark Valley AVA occupies a unique position in the Idaho wine landscape — geographically and climatically distinct from the Snake River Valley AVA to the south, and more closely related to the wine regions of eastern Washington than to the high-desert viticulture of the Treasure Valley. Understanding the relationship between the two Idaho AVAs is the key to understanding the full range of what Idaho wine can be.

The Snake River Valley AVA is a high-desert wine region — volcanic bench sites at 2,000 to 4,000 feet, with a continental climate, extreme diurnal temperature swings, and the short growing season that demands early-ripening varieties and careful vineyard management. The Lewis-Clark Valley AVA is a river canyon wine region — lower in elevation, warmer in summer, milder in winter, and with a longer growing season that allows a wider range of varieties to achieve full maturity. The two regions are genuinely complementary rather than competitive, and the wine lover who explores both will find that they illuminate each other in ways that deepen the understanding of Idaho wine as a whole.

The comparison with eastern Washington is equally instructive. The Lewis-Clark Valley shares the Columbia River Basalt geology, the warm, dry growing conditions, and the continental climate character of the Columbia Valley and the Walla Walla Valley to the west and north. But the canyon topography of the Lewis-Clark Valley creates a growing environment that is more sheltered, more mineral, and more distinctive than the open plateau sites of the Columbia Valley, and the wines produced here have a character that is genuinely different from the richer, more extracted Columbia Valley examples.

What unites the Lewis-Clark Valley with the broader Pacific Northwest wine tradition is the basalt — the ancient volcanic rock that underlies the entire Columbia Plateau and that gives the wines of the region their distinctive mineral character. The Lewis-Clark Valley basalt is among the oldest and most deeply weathered in the Columbia Plateau system, and the mineral complexity of the soils derived from it is reflected in every glass of wine produced from the canyon's vineyard sites.

The Lewis-Clark Valley wine country is one of the most accessible and most rewarding wine tourism destinations in the Pacific Northwest — close to the university towns of Lewiston and Moscow in Idaho and Pullman and Clarkston in Washington, surrounded by some of the most spectacular river canyon scenery in the American West, and with a wine culture that is genuinely welcoming to visitors.

The Lewiston-Clarkston Valley is the natural base for any Lewis-Clark Valley wine visit — a pair of twin cities at the confluence of the Snake and Clearwater Rivers that together form the commercial and cultural center of the region. Lewiston is the larger of the two cities, with a historic downtown, a growing restaurant and food scene, and the Clearwater Canyon Cellars tasting room that is the essential first stop on any Lewis-Clark Valley wine itinerary. Clarkston, on the Washington side of the river, is smaller and more residential, but the Aspen Ridge Cellars tasting room and the panoramic views of the river confluence make it a worthwhile stop.

The Moscow-Pullman corridor — the university towns 30 miles north of Lewiston on the Palouse plateau — is the other major wine tourism hub in the region, with the Colter's Creek tasting room in Moscow and the Merry Cellars operation in Pullman providing a complement to the canyon-bottom winery experience. The combination of the university town atmosphere, the farm-to-table dining scene that has developed around Washington State University and the University of Idaho, and the proximity of the Palouse country's dramatic rolling wheat fields makes the Moscow-Pullman corridor one of the most enjoyable wine tourism bases in the Pacific Northwest.

When to visit: The harvest season — late August through October — is the most rewarding time to visit the Lewis-Clark Valley wine country. The canyon's warm, dry autumn weather creates ideal conditions for the harvest, and the combination of the harvest activity in the vineyards, the release of the new vintage wines, and the spectacular autumn light of the canyon landscape makes this the most atmospheric time to be in the Lewis-Clark Valley. The Clearwater Canyon Cellars harvest events in September and October are among the most atmospheric wine experiences in Idaho.

Jet boat tours of Hells Canyon: The Lewis-Clark Valley's proximity to Hells Canyon — the deepest river gorge in North America, just south of the AVA boundary — makes it one of the most dramatic wine tourism destinations in the American West. Jet boat tours of Hells Canyon depart from Lewiston and Clarkston throughout the summer and autumn, offering a perspective on the Snake River canyon country that is genuinely unlike anything else in the Pacific Northwest. A morning jet boat tour of Hells Canyon followed by an afternoon of wine tasting at Clearwater Canyon Cellars and Colter's Creek is one of the great outdoor-wine combinations in the American West.

The Nez Perce National Historical Park: The Lewis-Clark Valley is the heart of Nez Perce country, and the Nez Perce National Historical Park — with sites scattered across the canyon country of north-central Idaho and southeastern Washington — provides a cultural and historical context for the wine country that is genuinely enriching. The park's visitor center in Spalding, Idaho, just east of Lewiston, is an essential stop for anyone who wants to understand the deep human history of the Lewis-Clark Valley and the relationship between the Nez Perce people and the river canyon landscape that defines the region.

The Palouse Scenic Byway: The drive from Lewiston north to Moscow and Pullman on the Palouse Scenic Byway — climbing from the canyon bottom at 700 feet to the plateau at 2,500 feet through a series of dramatic switchbacks — is one of the most spectacular short drives in the Pacific Northwest, offering panoramic views of the Snake River canyon and the rolling wheat fields of the Palouse country. The contrast between the warm, dry canyon bottom and the cool, fertile plateau above is one of the great geographical transitions in the American West, and it provides a vivid illustration of the growing conditions that make the Lewis-Clark Valley wine country so distinctive.

The Lewis-Clark Valley AVA is a wine region in the early stages of its development — an appellation that was established only in 2016 and that is still in the process of discovering what it can be, still building the infrastructure and the audience that will allow it to take its place among the serious wine regions of the Pacific Northwest.

The challenges are real. The Lewis-Clark Valley is geographically remote from the major wine media centers of the Pacific Northwest — further from Portland and Seattle than the Willamette Valley and the Columbia Valley, and less well-connected to the wine tourism infrastructure that has developed around those more established regions. The number of producers is small, and the planted vineyard acreage is a fraction of what the appellation's size and potential might suggest. The national wine press has been slow to discover the region, and the wines of the Lewis-Clark Valley rarely appear on restaurant lists outside the immediate Pacific Northwest.

But the evidence of genuine quality is accumulating. The Syrabs from Clearwater Canyon Cellars and Colter's Creek are attracting the attention of wine critics who have made the journey to the canyon country to taste them in context. The Cabernet Francs and Chardonnays are building an audience among wine drinkers who have discovered that the Lewis-Clark Valley's canyon terroir produces wines of a character that is genuinely different from anything else in the Pacific Northwest. And the establishment of the AVA in 2016 has provided the regulatory framework and the identity that the region needs to build its national reputation.

What the Lewis-Clark Valley has that no other wine region in the Pacific Northwest can claim is the history — the deep, layered human history of the river canyon country, from the Nez Perce people who fished these rivers for thousands of years to Lewis and Clark who camped at the confluence in 1805, from the fur traders and the missionaries and the gold miners who followed them to the farmers and orchardists who have worked the canyon benches for more than a century. That history is present in the landscape in ways that are visible and tangible — in the canyon walls that Lewis and Clark described in their journals, in the basalt terraces where the Nez Perce gathered camas bulbs and fished for salmon, in the orchards and grain fields that still define much of the agricultural character of the Lewiston bench.

The wines of the Lewis-Clark Valley carry that history in their character — in the mineral quality of the ancient basalt soils, in the warmth of the canyon climate that has sheltered human habitation for millennia, in the freshness of the river air that moderates the summer heat and preserves the aromatic complexity of the grapes. They are wines that are rooted in a specific place and a specific history, and they offer the wine lover who seeks them out an experience that is genuinely unlike anything else in the American wine landscape.

The confluence of the Clearwater and Snake Rivers at Lewiston is one of the most historically significant spots in the American West. It is also, increasingly, one of the most interesting wine destinations in the Pacific Northwest. Lewis and Clark would be surprised. They would also, one suspects, approve.