Lake Arlington: 93.7% full as of 2026-04-20

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 2026-04-20 93.7 548.67 37,654 37,622 40,157 1,890
1 day prior 2026-04-19 93.9 548.71 37,729 37,697 40,157 1,891
2 days prior 2026-04-18 93.8 548.70 37,710 37,678 40,157 1,890
1 week prior 2026-04-13 95.1 548.97 38,222 38,190 40,157 1,897
1 month prior 2026-03-20 97.3 549.43 39,097 39,065 40,157 1,908
3 months prior 2026-01-20 91.7 548.24 36,843 36,811 40,157 1,881
6 months prior 2025-10-20 84.7 546.75 34,063 34,031 40,157 1,852
1 year prior 2025-04-20 98.9 549.78 39,766 39,734 40,157 1,917
*

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 2026-04-20 15:15 548.64 550.00 -1.36
1 hour prior 2026-04-20 14:15 548.65 550.00 -1.35
2 hours prior 2026-04-20 13:15 548.65 550.00 -1.35
6 hours prior 2026-04-20 09:15 548.67 550.00 -1.33
12 hours prior 2026-04-20 03:15 548.68 550.00 -1.32
24 hours prior 2026-04-19 15:15 548.70 550.00 -1.30
48 hours prior 2026-04-18 15:15 548.72 550.00 -1.28
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1957-01-01
Vertical datum NGVD29
Dead pool elevation 505.00 ft above NGVD29
Service spillway crest elevation 550.00 ft above NGVD29
Emergency spillway crest elevation 559.70 ft above NGVD29
Top of dam elevation 577.50 ft above NGVD29
Conservation pool elevation 550.00 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1957-01-01 (source: USGS)
2007-12-01 (source: TWDB) : GIS Data
Data Source USGS:08049200
USGS Monitoring Location USGS:08049200

Lake Location