Outlook
Middle estimate, with the range the level has an 8 in 10 chance of landing in. The bars share one scale: change from today.
Rises are harder to call. Heavy rain in the watershed can push the lake above these ranges within days.
- Rain, past 7 days
- 0.3 in7 mm watershed average
- Rain forecast, next 7 days
- 1.4 in36 mm normal 0.4 in10 mm
Statistical estimate, not safety, boating, or water-quality advice. For ramps, closures and advisories, check the lake operator.
Map
Map of Twin Buttes Reservoir with the dam, level gauge and 12 public boat ramps.
- Dam
- Level gauge
- Public boat ramp
Ramp locations from Texas Parks and Wildlife. Whether a ramp is open depends on the lake level; check the operator.
Level and outlook
FeetMeters above sea level
- Measured
- Middle estimate
- 8 in 10 range
- Full pool
Show outlook as a table
| Date | Low end | Middle | High end |
|---|---|---|---|
| Nov 2 | 1893.9577.26 | 1894.2577.34 | 1894.5577.43 |
| Nov 9 | 1893.6577.18 | 1894.1577.32 | 1895.0577.60 |
| Nov 25 | 1893.3577.07 | 1893.7577.19 | 1896.6578.09 |
How well this outlook has done here
We tested the 2-week outlook on past years at this lake, as if made once a week with only what was known that day.
- On average it was off by
- 0.40 ft0.12 m Assuming the level stays the same was off by 0.61 ft0.19 m
- Actual level inside our range
- 82% of 429 tests; the range is built to catch 8 in 10
The rise chance uses the same threshold for every lake: 1 ft (0.3048 m).
Connected lakes
Water from upstream lakes flows into this one; water released here flows on downstream.
Downstream
Nearby lakes
Closest lakes in a straight line, with today's level.
- O. C. Fisher Lake8 mi13 km away · 1871.8 ft570.53 m · 10%
- E. V. Spence Reservoir34 mi55 km away · 1842.0 ft561.45 m · 9%
- Oak Creek Reservoir48 mi78 km away · 1973.2 ft601.44 m · 13%
- O. H. Ivie Reservoir52 mi84 km away · 1529.0 ft466.05 m · 41%
- Champion Creek Reservoir65 mi104 km away · 2063.8 ft629.03 m · 45%
- Hords Creek Lake65 mi105 km away · 1888.1 ft575.48 m · 45%
About Twin Buttes Reservoir
Twin Buttes Reservoir is a U.S. Bureau of Reclamation lake about 6 miles southwest of San Angelo, completed in 1963. Its dam is unusual: it holds back the Middle and South Concho rivers separately, with a channel linking the two pools. Lake Nasworthy is directly downstream.
- Full pool (conservation)
- 1940.2 ft591.37 m
- Highest level since 2000
- 1934.7 ft589.70 m, Jun 2019
- Lowest level since 2000
- 1881.1 ft573.35 m, Nov 2013
- Surface area at normal pool
- 23,508 acres9,513 ha
- Conservation storage
- 182,454 acre-feet225 million m³
- Dam
- Twin Buttes Dam, 1963
- River or creek
- Mid & So Concho Riv, Spring Cr
- County
- Tom Green
- Owner
- Bureau of Reclamation
Elevations are feetmeters above sea level (NGVD29).
Common questions
Is Twin Buttes Reservoir full right now?
On Oct 26 it was 1894.2 ft, 46.0 ft below full pool (1940.2 ft), holding 4% of its conservation storage.On Oct 26 it was 577.36 m, 14.01 m below full pool (591.37 m), holding 4% of its conservation storage.
Is Twin Buttes Reservoir going up or down?
The middle estimate for Nov 9 is about steady, with an 8 in 10 chance it ends between 1893.6 ft and 1895.0 ft. The chance it ends 1 ft or more higher than today is 5%. Heavy rain can change that quickly.The middle estimate for Nov 9 is about steady, with an 8 in 10 chance it ends between 577.18 m and 577.60 m. The chance it ends 0.3 m or more higher than today is 5%. Heavy rain can change that quickly.
Where does this data come from?
Daily levels come from the Texas Water Development Board and lake operators. The outlook is our own statistical model, using recent levels and forecast rain over the watershed.