Lake Arlington: 81.5% full as of 2026-10-04
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 | 2026-10-04 | 81.5 | 546.04 | 32,752 | 32,720 | 40,157 | 1,840 |
| Yesterday | 2026-10-03 | 80.9 | 545.91 | 32,513 | 32,481 | 40,157 | 1,837 |
| 2 days ago | 2026-10-02 | 80.0 | 545.71 | 32,146 | 32,114 | 40,157 | 1,834 |
| 1 week ago | 2026-09-27 | 68.9 | 543.25 | 27,694 | 27,662 | 40,157 | 1,778 |
| 1 month ago | 2026-09-04 | 74.2 | 544.43 | 29,813 | 29,781 | 40,157 | 1,810 |
| 3 months ago | 2026-07-04 | 89.8 | 547.83 | 36,074 | 36,042 | 40,157 | 1,872 |
| 6 months ago | 2026-04-04 | 96.1 | 549.18 | 38,620 | 38,588 | 40,157 | 1,902 |
| 1 year ago | 2025-10-04 | 87.0 | 547.24 | 34,972 | 34,940 | 40,157 | 1,861 |
*
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 | 2026-10-04 16:15 | 546.40 | 550.00 | -3.60 |
| 1 hour prior | 2026-10-04 15:15 | 546.33 | 550.00 | -3.67 |
| 2 hours prior | 2026-10-04 14:15 | 546.27 | 550.00 | -3.73 |
| 6 hours prior | 2026-10-04 10:15 | 546.11 | 550.00 | -3.89 |
| 12 hours prior | 2026-10-04 04:15 | 546.01 | 550.00 | -3.99 |
| 24 hours prior | 2026-10-03 16:15 | 545.94 | 550.00 | -4.06 |
| 48 hours prior | 2026-10-02 16:15 | 545.74 | 550.00 | -4.26 |
*
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
