Mark West Springs
Mark West Springs discharges at 88°F in Sonoma County wine country, emerging just 23 feet from a public road near Larkfield-Wikiup. This warm spring produces water 28 degrees above ambient in the Mark West Creek watershed, where thermal springs have been known since the region's earliest settlement north of Santa Rosa.
A short distance from the road through oak-dominated riparian vegetation reaches Mark West Springs at 440 feet elevation. Warm water emerges along Mark West Creek, supporting a lush riparian corridor of native vegetation contrasting with surrounding oak savanna and vineyard-covered hillsides. The thermal discharge creates a microclimate supporting species sensitive to cooler conditions.
Mark West Springs sits in the Mark West Creek drainage, a north-flowing system draining the lower Mayacamas Mountains. The 88°F temperature and 28-degree elevation above ambient (60°F) reflect moderate geothermal circulation in the region's tectonically active boundary between the San Andreas Fault system and the Cascade-Sierra volcanic arc. Early settlers valued these warm waters.
Access is simple from roads near Mark West Creek with minimal walking required. The spring sits in a developed wine-country landscape with nearby communities and amenities. Summer months offer warmest conditions, though the Mediterranean climate means mild temperatures year-round. Local access restrictions or private property boundaries may apply; confirm status before visiting. The 88°F water supports comfortable soaking in any season."
Is Mark West Springs worth visiting?
Best for
- Warm-water soaking
- Easy day trips
- Overnight camping trips
Overview Lake Sonoma's Boat-In Sites are scattered around beautiful Lake Sonoma, only a 45-minute drive north of Santa Rosa and a two-hour drive from San Francisco. BOAT-IN CAMPGROUNDS ARE ACCESSIBLE BY WATER OR HIKING ONLY, THERE IS NO VEHICLE ACCESS TO ANY BOAT-IN CAMPGROUNDWorld famous vineyards and a land rich in history surround the lake, where visitors enjoy boating, fishing and exploring the area's extensive trail network.Recreation The lake provides great boating and swimming opportun...