Lake Nasworthy: 86.0% full as of 2026-08-21

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 2026-08-21 86.0 1,871.76 8,762 8,269 9,615 1,236
Yesterday 2026-08-20 85.9 1,871.75 8,750 8,257 9,615 1,236
2 days ago 2026-08-19 85.9 1,871.75 8,750 8,257 9,615 1,236
1 week ago 2026-08-14 85.1 1,871.69 8,676 8,183 9,615 1,232
1 month ago 2026-07-21 86.5 1,871.80 8,812 8,319 9,615 1,239
3 months ago 2026-05-21 85.4 1,871.71 8,701 8,208 9,615 1,233
6 months ago 2026-02-21 86.1 1,871.77 8,775 8,282 9,615 1,237
1 year ago 2025-08-21 85.0 1,871.68 8,664 8,171 9,615 1,231
*

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 2026-08-21 10:30 1,871.76 1,872.71 -0.95
1 hour prior 2026-08-21 09:30 1,871.76 1,872.71 -0.95
2 hours prior 2026-08-21 08:30 1,871.76 1,872.71 -0.95
6 hours prior 2026-08-21 04:30 1,871.76 1,872.71 -0.95
12 hours prior 2026-08-20 22:30 1,871.75 1,872.71 -0.96
24 hours prior 2026-08-20 10:30 1,871.75 1,872.71 -0.96
48 hours prior 2026-08-19 10:30 1,871.76 1,872.71 -0.95
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1930-01-01
Vertical datum
Start date: 2023-08-23 		NAVD88
Vertical datum
End date: 2023-08-22 		NGVD29
Dead pool elevation
Start date: 2023-08-23 		1,860.51 ft above NAVD88
Dead pool elevation
End date: 2023-08-22 		1,860.00 ft above NGVD29
Service spillway crest elevation
Start date: 2023-08-23 		1,855.81 ft above NAVD88
Service spillway crest elevation
End date: 2023-08-22 		1,855.30 ft above NGVD29
Emergency spillway crest elevation
Start date: 2023-08-23 		1,879.61 ft above NAVD88
Emergency spillway crest elevation
End date: 2023-08-22 		1,879.10 ft above NGVD29
Top of dam elevation
Start date: 2023-08-23 		1,884.01 ft above NAVD88
Top of dam elevation
End date: 2023-08-22 		1,883.50 ft above NGVD29
Conservation pool elevation
Start date: 2023-08-23 		1,872.71 ft above NAVD88
Conservation pool elevation
End date: 2023-08-22 		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
Data Source USGS:08132000
USGS Monitoring Location USGS:08132000

Lake Location