Green River Soda Spring
Green River Soda Spring produces 86-degree carbonated water at 1,644 feet elevation, flowing 37.5 degrees above ambient temperature in Lewis County's forested terrain. This effervescent thermal spring sits just 41.7 meters from the nearest road near Morton, offering roadside access to naturally carbonated mineral water that derives its fizzy character from dissolved carbon dioxide.
The spring emerges in moderately elevated terrain in the western Cascade foothills, surrounded by mixed conifer forest dominated by Douglas fir, western hemlock, and western red cedar. The area receives 74.8 inches of annual precipitation with 74.5 inches of snowfall, supporting dense vegetation and numerous streams draining westward toward Puget Sound lowlands. The Green River flows nearby through timbered valleys, with clearcut patches and Forest Service roads indicating active forest management throughout this working landscape east of Morton.
The spring's name reflects both its location near the Green River drainage and its carbonated character, as soda springs have historically been sought for their mineral content and effervescence. Early settlers and loggers in the region likely knew of the spring, though specific documentation of commercial development or resort use is not readily available in published sources. The feature now exists as a minor roadside curiosity in an area dominated by timber production and recreation uses.
Visit year-round as the roadside location just 41.7 meters from the road provides easy access in most conditions, though winter snowfall of 74.5 inches may temporarily block access during heavy snow events. The carbonated water can be tasted but verify current water quality before consumption. The area experiences moderate temperatures averaging 48.5 degrees annually, making shoulder season visits particularly pleasant. Iron Creek Campground 22.1 kilometers away offers developed camping with reservations available.
Is Green River Soda Spring worth visiting?
Best for
- Warm-water soaking
- Easy day trips
- Overnight camping trips
Overview Iron Creek Campground sits near the confluence of Iron Creek and the Cispus River. This large campground winds through a forest of old-growth Douglas firs, cedars and hemlock. Lush vegetation and ample space between sites offers excellent privacy. Recreation Iron Creek provides great fishing for cutthroat trout, whitefish and rainbow trout. Visitors can stroll along the .3-mile Iron Creek Old Growth Trail and weave through the forest and along the Cispus River, or continue on a long...