Pinches Spring
Pinches Spring flows at 70 degrees Fahrenheit in Mendocino County's heavily forested mountains, creating moderately warm waters just 15 degrees above ambient in one of California's wettest thermal regions.
The spring emerges at 2,020 feet elevation through dense forest dominated by Douglas fir and mixed conifers. The 670-foot hike from the nearest road winds through lush understory vegetation nourished by 47 inches of annual precipitation and 17 inches of snow. Cool mountain air and abundant moisture create a verdant landscape where the modest thermal discharge supports unique riparian vegetation.
The spring's relatively low temperature (70°F) reflects circulation through shallower groundwater systems in this cool mountain environment. The heavy precipitation and snowfall interact with geothermal systems to produce warm rather than hot springs. Geological formation relates to regional heat flow beneath the Coast Ranges, moderated by the cool, wet climate.
The 670-foot walk is short and straightforward, though muddy conditions should be expected year-round given heavy precipitation. Best visited in late summer or early fall when trails are most passable. Bring waterproof gear; this region receives moisture almost constantly. The modest flow and cool setting make this a specialized spring for visitors seeking geothermally-heated water in old-growth forest.