Lake Arlington: 80.5% full as of 2026-10-24
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 | 2026-10-24 | 80.5 | 545.83 | 32,366 | 32,334 | 40,157 | 1,836 |
| Yesterday | 2026-10-23 | 80.8 | 545.89 | 32,476 | 32,444 | 40,157 | 1,837 |
| 2 days ago | 2026-10-22 | 81.1 | 545.95 | 32,586 | 32,554 | 40,157 | 1,838 |
| 1 week ago | 2026-10-17 | 82.5 | 546.27 | 33,175 | 33,143 | 40,157 | 1,844 |
| 1 month ago | 2026-09-24 | 69.2 | 543.33 | 27,836 | 27,804 | 40,157 | 1,781 |
| 3 months ago | 2026-07-24 | 88.6 | 547.59 | 35,625 | 35,593 | 40,157 | 1,868 |
| 6 months ago | 2026-04-24 | 95.7 | 549.09 | 38,449 | 38,417 | 40,157 | 1,899 |
| 1 year ago | 2025-10-24 | 85.1 | 546.83 | 34,211 | 34,179 | 40,157 | 1,854 |
*
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 | 2026-10-24 19:15 | 545.80 | 550.00 | -4.20 |
| 1 hour prior | 2026-10-24 18:15 | 545.80 | 550.00 | -4.20 |
| 2 hours prior | 2026-10-24 17:15 | 545.81 | 550.00 | -4.19 |
| 6 hours prior | 2026-10-24 13:15 | 545.82 | 550.00 | -4.18 |
| 12 hours prior | 2026-10-24 07:15 | 545.83 | 550.00 | -4.17 |
| 24 hours prior | 2026-10-23 19:15 | 545.87 | 550.00 | -4.13 |
| 48 hours prior | 2026-10-22 19:15 | 545.93 | 550.00 | -4.07 |
*
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
