Lake Arlington: 77.3% full as of 2026-08-23
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 | 2026-08-23 | 77.3 | 545.12 | 31,067 | 31,035 | 40,157 | 1,823 |
| Yesterday | 2026-08-22 | 77.2 | 545.10 | 31,030 | 30,998 | 40,157 | 1,823 |
| 2 days ago | 2026-08-21 | 77.1 | 545.08 | 30,994 | 30,962 | 40,157 | 1,823 |
| 1 week ago | 2026-08-16 | 76.8 | 545.02 | 30,885 | 30,853 | 40,157 | 1,822 |
| 1 month ago | 2026-07-23 | 89.3 | 547.74 | 35,905 | 35,873 | 40,157 | 1,871 |
| 3 months ago | 2026-05-23 | 94.7 | 548.88 | 38,051 | 38,019 | 40,157 | 1,895 |
| 6 months ago | 2026-02-23 | 93.7 | 548.68 | 37,672 | 37,640 | 40,157 | 1,890 |
| 1 year ago | 2025-08-23 | 92.1 | 548.34 | 37,031 | 36,999 | 40,157 | 1,883 |
*
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 | 2026-08-23 16:15 | 545.12 | 550.00 | -4.88 |
| 1 hour prior | 2026-08-23 15:15 | 545.13 | 550.00 | -4.87 |
| 2 hours prior | 2026-08-23 14:15 | 545.14 | 550.00 | -4.86 |
| 6 hours prior | 2026-08-23 10:15 | 545.13 | 550.00 | -4.87 |
| 12 hours prior | 2026-08-23 04:15 | 545.11 | 550.00 | -4.89 |
| 24 hours prior | 2026-08-22 16:15 | 545.10 | 550.00 | -4.90 |
| 48 hours prior | 2026-08-21 16:15 | 545.06 | 550.00 | -4.94 |
*
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
