Ancient Lakes of Columbia Valley AVA

Ancient Lakes of Columbia Valley AVA takes its name from a distinctive landscape feature: a series of small alkaline lake basins gouged into the Columbia River Basalt Group bedrock by the Missoula Floods at the end of the last ice age. As the Missoula Floods (approximately 15,000 to 13,000 years ago) raced across eastern Washington at 60 to 80 miles per hour, the floodwater scoured the basalt bedrock and created a network of dry channels (coulees), potholes (kolks), and lake basins where flood eddies and vortices intensified the scouring action. The Ancient Lakes AVA sits along the path of one major flood channel; the resulting landscape includes Quincy Lakes, Lenore Lake, Soap Lake, and Park Lake among other small flood-scoured basins. The lakes are alkaline (Soap Lake particularly is famous for its high alkalinity and mineral content, marketed historically as a therapeutic destination); the alkalinity reflects the lakes' relatively closed-basin character with limited fresh water inflow and evaporative concentration of dissolved minerals. The lake basins themselves are not directly used for viticulture (vines do not tolerate alkaline lake-shore soils well); the AVA's vineyard plantings sit on the surrounding basalt benches, slopes, and Missoula Flood gravels above the lake basins.

• Named for Ice Age lake basins gouged by Missoula Floods (~15,000-13,000 ya) scouring Columbia River Basalt Group bedrock; floodwater velocity 60-80 mph carved coulees, potholes, lake basins
• Lake series: Quincy Lakes, Lenore Lake, Soap Lake, Park Lake; alkaline closed-basin character from limited fresh water inflow + evaporative mineral concentration
• Soap Lake: famous for high alkalinity and mineral content; historically marketed as therapeutic destination; epitomizes alkaline lake character
• Vineyard plantings on surrounding basalt benches, slopes, and Missoula Flood gravels above lake basins (not on alkaline lake-shore soils that vines do not tolerate well)

Ancient Lakes has emerged as Washington's Riesling specialization zone, with significant high-quality Riesling plantings concentrated in the AVA. The combination of high elevation (230 to 600 metres, cooler than broader Columbia Valley basin sites), cool nights (significant diurnal swings preserving acidity), well-drained gravelly soils, and very dry climate produces structured Riesling with the high natural acidity that defines premium Riesling globally. The Evergreen Vineyard is the most-cited single vineyard in the AVA: a major Ste. Michelle Wine Estates source for Riesling production, the vineyard supplies fruit to the Eroica joint venture with Mosel's Dr. Loosen (alongside the Wahluke Slope Cold Creek Vineyard, the other Eroica primary source). Pacific Rim Winemakers (the dedicated Riesling specialist founded 1992 by Randall Grahm, now part of the Banfi/Pacific Rim portfolio) sources extensively from Ancient Lakes. Long Shadows Vintners (the Allen Shoup multi-winemaker collaborative) produces its Poet's Leap Riesling (made in collaboration with Ernst Loosen's brother Thomas Loosen of Schloss Lieser) using significant Ancient Lakes fruit. Beyond Riesling, the AVA's cool-climate position supports quality Chardonnay, Pinot Gris, and Sauvignon Blanc plantings.

• Washington's Riesling specialization zone: high elevation (230-600 m) + cool nights + dry climate + diurnal swings preserve acidity
• Evergreen Vineyard: major Ste. Michelle Wine Estates source for Riesling; supplies fruit to Eroica JV with Dr. Loosen (alongside Wahluke Slope Cold Creek Vineyard)
• Pacific Rim Winemakers (Randall Grahm 1992 founding, now Banfi/Pacific Rim portfolio): dedicated Riesling specialist sourcing extensively from Ancient Lakes
• Long Shadows Poet's Leap Riesling (Thomas Loosen of Schloss Lieser collaboration): uses significant Ancient Lakes fruit; among premium WA Riesling references

Ancient Lakes' geological foundation is the Columbia River Basalt Group: Wanapum Basalt and Saddle Mountains Basalt formations form the bedrock across the AVA, with basalt outcrops common at upper slope and bench sites. Overlying the basalt are Missoula Flood deposits (gravel bars at flood-channel zones, sand at intermediate flow zones, slack-water silts at low-elevation backwater zones) plus windblown loess capping the upper benches and ridges. The combined soil profile is well-drained gravelly to silty-loam with good rooting depth; the gravel content provides drainage through the limited but concentrated rainfall, while the loess cap retains moisture through the dry summer growing season. The climate is continental high-desert with Cascade rain shadow: approximately 7 to 8 inches annual rainfall, hot dry summers (90+ degrees F afternoons common), cold winters with potential vine-damaging freeze events, 16-17 hours summer daylight driving phenolic ripening, and 30-35 F diurnal swings between summer afternoon highs and overnight lows. The AVA's elevation range (230 to 600 metres) creates microclimate diversity within the boundary: lower-elevation sites warm and ripen Cabernet Sauvignon and other warmer-climate varieties; higher-elevation sites support cool-climate aromatic whites and produce structured Riesling.

• Geological foundation: Wanapum Basalt + Saddle Mountains Basalt (CRBG formations) form bedrock; basalt outcrops at upper slope and bench sites
• Overlying deposits: Missoula Flood gravels + sands + slack-water silts + windblown loess on upper benches and ridges; well-drained gravelly to silty-loam profile
• Climate: continental high-desert with Cascade rain shadow; 7-8 inches annual rainfall, 90+ F summer afternoons, 16-17 hours summer daylight, 30-35 F diurnal swings
• Elevation 230-600 metres creates microclimate diversity: lower-elevation warmer sites for Cabernet/Syrah; higher-elevation cooler sites for cool-climate aromatic whites and structured Riesling

Ancient Lakes' producer landscape is anchored by Cave B Estate Winery, the AVA's largest estate winery with significant vineyard plantings, a hotel resort, and an event facility (the Gorge Amphitheater concert venue sits adjacent to the Cave B property). Cave B was founded 1986 as Champs de Brionne and rebranded Cave B in the early 2000s; the estate produces Riesling, Pinot Gris, Chardonnay, Cabernet Sauvignon, Syrah, and other varieties across its diversified vineyard. Beyond Cave B, the AVA's producer count is modest: Jones of Washington (family operation with extensive vineyards), Beaumont Cellars, Ryan Patrick Wines, Milbrandt Vineyards (major grower-producer with broad Columbia Valley reach), Stemilt Creek Winery, and a handful of other small estates. The AVA's principal commercial significance is as a grower region supplying premium fruit to broader Washington producers: the Evergreen Vineyard, Milbrandt vineyards, and other major sites supply Ste. Michelle Wine Estates, Pacific Rim, Long Shadows, and others. The AVA's emerging tourism profile (anchored by the Cave B resort plus the Gorge Amphitheater concert tourism) supports growing tasting-room production alongside the volume grower-supplier role.

• Cave B Estate Winery: AVA's largest estate winery; founded 1986 as Champs de Brionne, rebranded Cave B early 2000s; hotel resort + event facility (Gorge Amphitheater adjacent); diversified vineyard producing Riesling, Pinot Gris, Chardonnay, Cab, Syrah
• Modest direct-producer count: Jones of Washington, Beaumont Cellars, Ryan Patrick Wines, Milbrandt Vineyards (major grower-producer), Stemilt Creek Winery
• Principal commercial significance: grower region supplying premium fruit to broader WA producers (Ste. Michelle, Pacific Rim, Long Shadows, etc.)
• Tourism profile: Cave B resort + Gorge Amphitheater concert tourism supports growing tasting-room production alongside volume grower-supplier role