Red Bluff Reservoir: 55.0% full as of 2026-04-20

The elevation-storage rating curve used to produce the storage hydrograph is made of two segments: (1) the segment up to the conservation pool top (below the red line) is based on measured data, and (2) the segment in the flood pool (above the red line) is an extrapolation from the first segment and shouldn't be relied upon for flood storage information.

Historical Data

Date Percent Full Mean Water Level
(ft) 		Reservoir Storage
(acre-ft) 		Conservation Storage
(acre-ft) 		Conservation Capacity
(acre-ft) 		Surface Area
(acres)
Most recent 2026-04-20 55.0 2,817.54 79,784 79,784 145,165 5,085
1 day prior 2026-04-19 55.1 2,817.58 79,992 79,992 145,165 5,093
2 days prior 2026-04-18 55.4 2,817.67 80,462 80,462 145,165 5,110
1 week prior 2026-04-13 56.3 2,817.91 81,713 81,713 145,165 5,157
1 month prior 2026-03-20 57.2 2,818.15 82,964 82,964 145,165 5,203
3 months prior 2026-01-20 54.0 2,817.27 78,376 78,376 145,165 5,033
6 months prior 2025-10-20 50.7 2,816.29 73,629 73,629 145,165 4,838
1 year prior 2025-04-20 40.3 2,812.95 58,535 58,535 145,165 4,171
*

Percent Full is based on Conservation Storage and Conservation Capacity and doesn't account for storage in flood pool.

**

   Values above, including today's are averaged conditions. For near real-time instantaneous water level, see table below or the interactive map viewer.

Most Recent Instantaneous Water Level

Date/time Water Level
(ft) 		Conservation Pool Elevation
(ft) 		Height Above Conservation Pool
(ft)
Most recent 2026-04-20 15:15 2,817.53 2,828.10 -10.57
1 hour prior 2026-04-20 14:15 2,817.54 2,828.10 -10.56
2 hours prior 2026-04-20 13:15 2,817.53 2,828.10 -10.57
6 hours prior 2026-04-20 09:15 2,817.52 2,828.10 -10.58
12 hours prior 2026-04-20 03:15 2,817.55 2,828.10 -10.55
24 hours prior 2026-04-19 15:15 2,817.58 2,828.10 -10.52
48 hours prior 2026-04-18 15:15 2,817.65 2,828.10 -10.45
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1936-01-01
Vertical datum
Start date: 2022-09-13 		NAVD88
Vertical datum
Start date to end date: 1999-04-17 to 2022-09-12 		NGVD29
Service spillway crest elevation
Start date: 2022-09-13 		2,828.10 ft above NAVD88
Service spillway crest elevation
End date: 2022-09-12 		2,827.40 ft above NGVD29
Top of gate elevation
Start date: 2022-09-13 		2,843.10 ft above NAVD88
Top of gate elevation
End date: 2022-09-12 		2,842.40 ft above NGVD29
Emergency spillway crest elevation
Start date: 2022-09-13 		2,846.10 ft above NAVD88
Emergency spillway crest elevation
End date: 2022-09-12 		2,845.40 ft above NGVD29
Top of dam elevation
Start date: 2022-09-13 		2,857.10 ft above NAVD88
Top of dam elevation
End date: 2022-09-12 		2,856.40 ft above NGVD29
Conservation pool elevation
Start date: 2022-09-13 		2,828.10 ft above NAVD88
Conservation pool elevation
End date: 2022-09-12 		2,827.40 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

2011-11-01 (source: TWDB) : GIS Data
Data Source USGS:08410000
USGS Monitoring Location USGS:08410000

Lake Location