Notes

2021-07-09: The lake elevation gauge for Lake Nasworthy has been out of service since May 2021. When a new gauge has been installed by the City of San Angelo, we will resume updating storage data for Lake Nasworthy.

Lake Nasworthy: 86.6% full as of 2022-12-09

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 2022-12-09 86.6 1,871.30 8,824 8,331 9,615 1,240
1 day prior 2022-12-08 86.6 1,871.30 8,824 8,331 9,615 1,240
2 days prior 2022-12-07 86.6 1,871.30 8,824 8,331 9,615 1,240
1 week prior 2022-12-02 86.8 1,871.31 8,836 8,343 9,615 1,241
1 month prior 2022-11-09 - n.a. - - n.a. - - n.a. - - n.a. - - n.a. - - n.a. -
3 months prior 2022-09-09 86.0 1,871.25 8,762 8,269 9,615 1,236
6 months prior 2022-06-09 84.5 1,871.13 8,615 8,122 9,615 1,228
1 year prior 2021-12-09 84.0 1,871.09 8,566 8,073 9,615 1,225
*

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 2022-12-10 02:15 1,871.30 1,872.20 -0.90
1 hour prior 2022-12-10 01:15 1,871.30 1,872.20 -0.90
2 hours prior 2022-12-10 00:15 1,871.30 1,872.20 -0.90
6 hours prior 2022-12-09 20:15 1,871.30 1,872.20 -0.90
12 hours prior 2022-12-09 14:15 1,871.30 1,872.20 -0.90
24 hours prior 2022-12-09 02:15 1,871.30 1,872.20 -0.90
48 hours prior 2022-12-08 02:15 1,871.30 1,872.20 -0.90
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1930-01-01
Gauge USBR:NAST2
Vertical datum NGVD29
Dead pool elevation 1,860.00 ft above NGVD29
Service spillway crest elevation 1,855.30 ft above NGVD29
Top of flood gate elevation 1,873.20 ft above NGVD29
Emergency spillway crest elevation 1,879.10 ft above NGVD29
Top of dam elevation 1,883.50 ft above NGVD29
Conservation pool elevation 1,872.20 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1971-01-01 (source: USBR)
1993-09-01 (source: TWDB) : GIS Data

Lake Location