Twin Buttes Reservoir: 6.3% full as of 2026-08-29

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 2026-08-29 6.3 1,897.50 15,160 11,411 182,454 1,202
1 day prior 2026-08-28 6.3 1,897.54 15,207 11,458 182,454 1,205
2 days prior 2026-08-27 6.3 1,897.60 15,279 11,530 182,454 1,209
1 week prior 2026-08-22 6.5 1,897.94 15,684 11,935 182,454 1,229
1 month prior 2026-07-29 7.8 1,899.67 17,898 14,149 182,454 1,335
3 months prior 2026-05-29 9.8 1,902.35 21,705 17,956 182,454 1,524
6 months prior 2026-02-28 11.5 1,904.31 24,806 21,057 182,454 1,665
1 year prior 2025-08-29 14.7 1,907.52 30,626 26,877 182,454 1,995
*

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 2026-08-29 23:00 1,897.48 1,940.20 -42.72 below flood pool
1 hour prior 2026-08-29 22:00 1,897.48 1,940.20 -42.72 below flood pool
2 hours prior 2026-08-29 21:00 1,897.48 1,940.20 -42.72 below flood pool
6 hours prior 2026-08-29 17:00 1,897.48 1,940.20 -42.72 below flood pool
12 hours prior 2026-08-29 11:00 1,897.50 1,940.20 -42.70 below flood pool
24 hours prior 2026-08-28 23:00 1,897.51 1,940.20 -42.69 below flood pool
48 hours prior 2026-08-27 23:00 1,897.57 1,940.20 -42.63 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1963-01-01
Vertical datum NGVD29
Dead pool elevation 1,885.00 ft above NGVD29
Emergency spillway crest elevation 1,969.10 ft above NGVD29
Flood pool elevation 1,969.10 ft above NGVD29
Maximum design elevation 1,985.00 ft above NGVD29
Top of dam elevation 1,991.00 ft above NGVD29
Conservation pool elevation 1,940.20 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1964-01-01 (source: USBR)
Data Source USGS:08131200
USGS Monitoring Location USGS:08131200

Lake Location