Union ReservoirWater Level & Temperature
Union Reservoir water level & water temperature
Union Reservoir water level is updated continuously from the operating agency. Full pool elevation is 4957 ft. Live reading, 7-day trend, and multi-year history appear below as the data loads.
Union Reservoir water temperature by month
Union Reservoir surface water temperature averages from about 36°F in January to 75°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
36°
Feb
37°
Mar
42°
Apr
50°
May
61°
Jun
70°
Jul
75°
Aug
74°
Sep
69°
Oct
57°
Nov
45°
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.