Lake Arlington: 76.3% full as of 2026-08-11
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 | 2026-08-11 | 76.3 | 544.91 | 30,684 | 30,652 | 40,157 | 1,820 |
| Yesterday | 2026-08-10 | 76.2 | 544.88 | 30,630 | 30,598 | 40,157 | 1,819 |
| 2 days ago | 2026-08-09 | 76.8 | 545.01 | 30,866 | 30,834 | 40,157 | 1,821 |
| 1 week ago | 2026-08-04 | 80.4 | 545.80 | 32,311 | 32,279 | 40,157 | 1,835 |
| 1 month ago | 2026-07-11 | 87.2 | 547.28 | 35,047 | 35,015 | 40,157 | 1,862 |
| 3 months ago | 2026-05-11 | 94.6 | 548.86 | 38,013 | 37,981 | 40,157 | 1,894 |
| 6 months ago | 2026-02-11 | 92.3 | 548.37 | 37,088 | 37,056 | 40,157 | 1,883 |
| 1 year ago | 2025-08-11 | 97.0 | 549.38 | 39,001 | 38,969 | 40,157 | 1,906 |
*
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 | 2026-08-11 17:15 | 544.91 | 550.00 | -5.09 |
| 1 hour prior | 2026-08-11 16:15 | 544.93 | 550.00 | -5.07 |
| 2 hours prior | 2026-08-11 15:15 | 544.92 | 550.00 | -5.08 |
| 6 hours prior | 2026-08-11 11:15 | 544.93 | 550.00 | -5.07 |
| 12 hours prior | 2026-08-11 05:15 | 544.90 | 550.00 | -5.10 |
| 24 hours prior | 2026-08-10 17:15 | 544.86 | 550.00 | -5.14 |
| 48 hours prior | 2026-08-09 17:15 | 544.99 | 550.00 | -5.01 |
*
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 |
| Data Source | USGS:08049200 |
| USGS Monitoring Location | USGS:08049200 |
Lake Location
