About Hot Creek Geological Site
As Mammoth Creek leaves the Sierra and flows east into the Long Valley Caldera it is joined by warmer water from geothermal springs at the Hot Creek State Fish Hatchery. From this confluence the stream is named Hot Creek, though its water temperature seldom exceeds 68 °F (20 °C) until it reaches Hot Creek Gorge, 8 miles (13 km) east of Mammoth Lakes. In the Hot Creek Gorge, numerous hot springs near and in the stream bed add hot water into the stream. Its mouth is at the confluence with the Owens River upstream from Crowley Lake.