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Union Valley Reservoir Water Level Today

Daily level, distance to full pool and history for Union Valley Reservoir, on the Silver Creek (South Fork American River basin) in California.

Updated · Source: CDEC station UNV Provisional

Water level Provisional

4,817.96ft

msl · 7:00 AM PST, Nov 9, 2026

  • 52.04 ftbelow full pool (4,870.0 ft)
  • −0.12 ftin 24 h−0.92 ft in 7 days−8.85 ft in 30 days
4,8104,8204,8304,8404,8504,8604,8704,8804,8904,8104,8204,8304,8404,8504,8604,8704,8804,8904,8104,8204,8304,8404,8504,8604,8704,8804,890
  • Full pool
  • 1 yr ago

Is Union Valley Reservoir full?

No. Union Valley Reservoir is 52.04 ft below full pool (4,870.0 ft). It is 18.76 ft lower than a year ago (4,836.72 ft on Nov 9, 2025).

Union Valley Reservoir level history

View data table
DateLevel (ft)
Nov 9, 20264,817.96
Nov 8, 20264,818.06
Nov 7, 20264,818.18
Nov 6, 20264,818.31
Nov 5, 20264,818.44
Nov 4, 20264,818.57
Nov 3, 20264,818.69
Nov 2, 20264,818.84
Nov 1, 20264,819.07
Oct 31, 20264,819.19
Oct 30, 20264,819.34
Oct 29, 20264,819.52
Oct 28, 20264,819.72
Oct 27, 20264,819.85
Oct 26, 20264,820.47
Oct 25, 20264,821.22
Oct 24, 20264,821.90
Oct 23, 20264,822.27
Oct 22, 20264,822.57
Oct 21, 20264,822.83
Oct 20, 20264,823.12
Oct 19, 20264,823.47
Oct 18, 20264,823.92
Oct 17, 20264,824.35
Oct 16, 20264,824.66
Oct 15, 20264,825.01
Oct 14, 20264,825.30
Oct 13, 20264,825.67
Oct 12, 20264,825.86
Oct 11, 20264,826.43
Oct 10, 20264,826.81
  • Union Valley Reservoir level
  • Full pool 4,870.0 ft
  • Above full pool
Source: CDEC · Daily averages since 1996

Union Valley Reservoir on Nov 9 in past years

Union Valley Reservoir water level on Nov 9 in past years
YearLevel (ft)vs todayvs full pool
2026today4,817.96—−52.04 ft
20254,836.72+18.76−33.28 ft
20244,828.39+10.43−41.61 ft
20234,828.36+10.40−41.64 ft
20224,832.24+14.28−37.76 ft
20214,806.12−11.84−63.88 ft
20204,820.59+2.63−49.41 ft
20194,816.39−1.57−53.61 ft
20184,826.07+8.11−43.93 ft
20174,841.11+23.15−28.89 ft
20164,829.43+11.47−40.57 ft

Today’s level is the lowest for this date since 2021.

Lake facts

Full pool (conservation pool)
4,870.0 ft msl
Highest since 1996
4,869.89 ftJun 15, 1997
Lowest since 1996
4,724.35 ftFeb 1, 2001
Data since
Aug 30, 1996
Dam
Union Valley Damcompleted 1962
River
Silver Creek (South Fork American River basin)
Owned by
Sacramento Municipal Utility District
Dam location
El Dorado County
Gauge location
38.8640, −120.4380

Dam, river and owner from the National Inventory of Dams (USACE). Records cover Aug 30, 1996 to today (daily averages).

Union Valley Reservoir map and depth

  • Dam and level gauge
Shoreline © OpenStreetMap contributors · Open the full map
Average depth when full
about 103 ftcapacity ÷ surface area
Surface area
about 2,600 acresmeasured on the OpenStreetMap outline
Height of Union Valley Dam
455 ftNational Inventory of Dams

The outline shows the mapped shoreline, not today’s water line: when the lake is low, the water stands back from it.

Weather on the lake

  1. Today63°FHighLow 38°FSW 0–5 mphMostly Sunny
  2. Tonight38°FLowENE 2–6 mphMostly Clear
  3. Tuesday68°FHighLow 40°FN 3 mphSunny
  4. Wednesday68°FHighLow 41°FS 0–5 mphSunny
  5. Thursday63°FHighLow 38°FSSW 2–6 mphSunny
  6. Friday56°FHighLow 37°FS 2–7 mphSlight Chance Light Rain
  7. Saturday54°FHighLow 35°FSSE 2–8 mphSlight Chance Light Rain

Forecast: National Weather Service for the dam area (38.86, −120.44). Wind speeds are forecasts, not measurements.

Nearby lakes

Quick answers

What is the full pool level of Union Valley Reservoir?
4,870.0 ft above mean sea level, the top of its conservation pool. Above it, water is released or flows over the spillway of Union Valley Dam.
How much does Union Valley Reservoir need to be full?
Union Valley Reservoir needs 52.04 ft more water to reach full pool (4,870.0 ft), as of Nov 9, 2026.
How deep is Union Valley Reservoir?
Union Valley Reservoir is about 103 ft deep on average when full: 266,369 acre-ft of storage spread over about 2,600 acres of surface. As in most reservoirs, the deepest water is in the old river channel near Union Valley Dam.
Is Union Valley Reservoir rising or falling?
It is falling: −0.92 ft in the last 7 days and −0.12 ft in 24 hours, to 4,817.96 ft on 7:00 AM PST, Nov 9, 2026 (California Data Exchange Center).
What is the highest level in our data?
Union Valley Reservoir reached 4,869.89 ft on Jun 15, 1997. The lowest was 4,724.35 ft on Feb 1, 2001 (CDEC data since 1996; older records are not in this data set).
How much has Union Valley Reservoir changed in the last year?
In the last 12 months it ranged from 4,817.98 ft (Nov 9, 2026) to 4,869.19 ft (Jun 21, 2026), a swing of 51.21 ft.
How often is this page updated?
This page is updated several times a day with the latest reading from California Data Exchange Center. The last reading is from 7:00 AM PST, Nov 9, 2026.

Where this data comes from

Hourly reservoir elevation from the California Data Exchange Center of the California Department of Water Resources (station UNV, cdec.water.ca.gov). Recent readings are provisional and may be revised. Weather from the National Weather Service. Dam details from the National Inventory of Dams.

Lake Levels Daily is an independent site, not affiliated with TWDB, LCRA, USACE, USGS, NOAA, TVA or any lake operator. Check official sources before making safety decisions.