Twin Buttes Reservoir: 5.9% full as of 2026-09-06

Historical Data

Date Percent Full Mean Water Level
(ft) 		Reservoir Storage
(acre-ft) 		Conservation Storage
(acre-ft) 		Conservation Capacity
(acre-ft) 		Surface Area
(acres)
Today 2026-09-06 5.9 1,896.88 14,427 10,678 182,454 1,165
Yesterday 2026-09-05 5.9 1,896.92 14,472 10,723 182,454 1,167
2 days ago 2026-09-04 5.9 1,896.99 14,552 10,803 182,454 1,171
1 week ago 2026-08-30 6.2 1,897.45 15,100 11,351 182,454 1,199
1 month ago 2026-08-06 7.4 1,899.17 17,237 13,488 182,454 1,304
3 months ago 2026-06-06 9.7 1,902.14 21,386 17,637 182,454 1,509
6 months ago 2026-03-06 11.5 1,904.26 24,722 20,973 182,454 1,662
1 year ago 2025-09-06 14.5 1,907.34 30,270 26,521 182,454 1,975
*

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 2026-09-06 00:00 1,896.88 1,940.20 -43.32 below flood pool
1 hour prior 2026-09-05 23:00 1,896.89 1,940.20 -43.31 below flood pool
2 hours prior 2026-09-05 22:00 1,896.89 1,940.20 -43.31 below flood pool
6 hours prior 2026-09-05 18:00 1,896.90 1,940.20 -43.30 below flood pool
12 hours prior 2026-09-05 12:00 1,896.92 1,940.20 -43.28 below flood pool
24 hours prior 2026-09-05 00:00 1,896.95 1,940.20 -43.25 below flood pool
48 hours prior 2026-09-04 00:00 1,897.03 1,940.20 -43.17 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