Lake Arlington: 76.7% full as of 2026-08-15
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 | 2026-08-15 | 76.7 | 545.00 | 30,848 | 30,816 | 40,157 | 1,821 |
| Yesterday | 2026-08-14 | 76.6 | 544.98 | 30,812 | 30,780 | 40,157 | 1,821 |
| 2 days ago | 2026-08-13 | 76.6 | 544.96 | 30,775 | 30,743 | 40,157 | 1,821 |
| 1 week ago | 2026-08-08 | 77.4 | 545.15 | 31,121 | 31,089 | 40,157 | 1,824 |
| 1 month ago | 2026-07-15 | 91.5 | 548.20 | 36,768 | 36,736 | 40,157 | 1,880 |
| 3 months ago | 2026-05-15 | 93.4 | 548.61 | 37,540 | 37,508 | 40,157 | 1,888 |
| 6 months ago | 2026-02-15 | 96.4 | 549.24 | 38,734 | 38,702 | 40,157 | 1,903 |
| 1 year ago | 2025-08-15 | 95.6 | 549.07 | 38,411 | 38,379 | 40,157 | 1,899 |
*
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 | 2026-08-15 17:15 | 545.05 | 550.00 | -4.95 |
| 1 hour prior | 2026-08-15 16:15 | 545.00 | 550.00 | -5.00 |
| 2 hours prior | 2026-08-15 15:15 | 545.00 | 550.00 | -5.00 |
| 6 hours prior | 2026-08-15 11:15 | 545.00 | 550.00 | -5.00 |
| 12 hours prior | 2026-08-15 05:15 | 544.99 | 550.00 | -5.01 |
| 24 hours prior | 2026-08-14 17:15 | 544.97 | 550.00 | -5.03 |
| 48 hours prior | 2026-08-13 17:15 | 544.92 | 550.00 | -5.08 |
*
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
