Lake Arlington: 77.8% full as of 2026-11-13
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 | 2026-11-13 | 77.8 | 545.24 | 31,286 | 31,254 | 40,157 | 1,826 |
| Yesterday | 2026-11-12 | 77.9 | 545.26 | 31,322 | 31,290 | 40,157 | 1,826 |
| 2 days ago | 2026-11-11 | 78.1 | 545.29 | 31,377 | 31,345 | 40,157 | 1,827 |
| 1 week ago | 2026-11-06 | 78.6 | 545.40 | 31,578 | 31,546 | 40,157 | 1,828 |
| 1 month ago | 2026-10-13 | 83.7 | 546.53 | 33,655 | 33,623 | 40,157 | 1,848 |
| 3 months ago | 2026-08-13 | 76.6 | 544.96 | 30,775 | 30,743 | 40,157 | 1,821 |
| 6 months ago | 2026-05-13 | 94.1 | 548.76 | 37,824 | 37,792 | 40,157 | 1,892 |
| 1 year ago | 2025-11-13 | 91.1 | 548.12 | 36,617 | 36,585 | 40,157 | 1,878 |
*
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 | 2026-11-13 21:15 | 545.23 | 550.00 | -4.77 |
| 1 hour prior | 2026-11-13 20:15 | 545.23 | 550.00 | -4.77 |
| 2 hours prior | 2026-11-13 19:15 | 545.24 | 550.00 | -4.76 |
| 6 hours prior | 2026-11-13 15:15 | 545.24 | 550.00 | -4.76 |
| 12 hours prior | 2026-11-13 09:15 | 545.24 | 550.00 | -4.76 |
| 24 hours prior | 2026-11-12 21:15 | 545.26 | 550.00 | -4.74 |
| 48 hours prior | 2026-11-11 21:15 | 545.27 | 550.00 | -4.73 |
*
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
