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 Lake Nasworthy with the dam, level gauge and 14 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 | 1871.7570.49 | 1871.8570.53 | 1872.0570.57 |
| Nov 9 | 1871.7570.49 | 1871.8570.53 | 1872.1570.60 |
| Nov 25 | 1871.6570.47 | 1871.8570.54 | 1872.1570.62 |
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
- 0.10 ft0.03 m Assuming the level stays the same was off by 0.09 ft0.03 m
- Actual level inside our range
- 90% of 398 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.
Nearby lakes
Closest lakes in a straight line, with today's level.
- O. C. Fisher Lake7 mi11 km away · 1871.8 ft570.53 m · 10%
- E. V. Spence Reservoir34 mi55 km away · 1842.0 ft561.45 m · 9%
- Oak Creek Reservoir47 mi75 km away · 1973.2 ft601.44 m · 13%
- Hords Creek Lake62 mi100 km away · 1888.1 ft575.48 m · 45%
- Champion Creek Reservoir66 mi106 km away · 2063.8 ft629.03 m · 45%
- Brady Creek Reservoir67 mi108 km away · 1740.5 ft530.50 m · 84%
About Lake Nasworthy
Lake Nasworthy is a small city lake in San Angelo on the South Concho River, built in 1930 to supply water to San Angelo. It is named for John R. Nasworthy, who sold the land to the city. Twin Buttes Reservoir sits directly upstream.
- Full pool (conservation)
- 1872.7 ft570.80 m
- Highest level since 1996
- 1872.5 ft570.74 m, Nov 2024
- Lowest level since 1996
- 1867.7 ft569.28 m, May 2014
- Surface area at normal pool
- 1,380 acres558 ha
- Conservation storage
- 9,615 acre-feet12 million m³
- Dam
- Nasworthy Dam, 1930
- River or creek
- South Concho River
- County
- Tom Green
- Owner
- City of San Angelo
Elevations are feetmeters above sea level (NAVD88).
Common questions
Is Lake Nasworthy full right now?
On Oct 26 it was 1871.7 ft, 1.0 ft below full pool (1872.7 ft), holding 86% of its conservation storage.On Oct 26 it was 570.51 m, 0.30 m below full pool (570.80 m), holding 86% of its conservation storage.
Is Lake Nasworthy going up or down?
The middle estimate for Nov 9 is about steady, with an 8 in 10 chance it ends between 1871.7 ft and 1872.1 ft. The chance it ends 1 ft or more higher than today is under 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 570.49 m and 570.60 m. The chance it ends 0.3 m or more higher than today is under 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.