American Falls ReservoirWater Level & Temperature
American Falls Reservoir water level & water temperature
American Falls Reservoir water level is updated continuously from the operating agency. Full pool elevation is 4354.5 ft. Live reading, 7-day trend, and multi-year history appear below as the data loads.
American Falls Reservoir water temperature by month
American Falls Reservoir surface water temperature averages from about 35°F in January to 73°F in July over the year, based on a 40-year USGS model (1980–2020). Cold-water caution applies in roughly half the year, when the typical temperature is below 60°F.
Jan
35°
Feb
35°
Mar
41°
Apr
50°
May
59°
Jun
67°
Jul
73°
Aug
71°
Sep
65°
Oct
55°
Nov
44°
Dec
37°
Typical surface temperatures (°F), modeled historical averages (USGS 185k-lake dataset, 1980–2020). Colors flag cold-water risk: blue/amber/red = cool, caution, danger. Live and recent readings appear above where a sensor is available.