Stillhouse Hollow Lake: 99.4% full as of 2026-08-22
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 | 2026-08-22 | 99.4 | 621.78 | 228,471 | 228,385 | 229,796 | 6,398 |
| Yesterday | 2026-08-21 | 99.4 | 621.79 | 228,534 | 228,448 | 229,796 | 6,399 |
| 2 days ago | 2026-08-20 | 99.5 | 621.82 | 228,727 | 228,641 | 229,796 | 6,403 |
| 1 week ago | 2026-08-15 | 99.8 | 621.94 | 229,496 | 229,410 | 229,796 | 6,421 |
| 1 month ago | 2026-07-22 | 100.0 | 623.20 | 237,701 | 229,796 | 229,796 | - n.a. - |
| 3 months ago | 2026-05-22 | 100.0 | 623.93 | 242,560 | 229,796 | 229,796 | - n.a. - |
| 6 months ago | 2026-02-22 | 95.0 | 620.19 | 218,476 | 218,390 | 229,796 | 6,181 |
| 1 year ago | 2025-08-22 | 100.0 | 622.78 | 234,940 | 229,796 | 229,796 | - n.a. - |
*
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 | 2026-08-22 16:00 | 621.76 | 622.00 | -0.24 |
| 1 hour prior | 2026-08-22 15:00 | 621.76 | 622.00 | -0.24 |
| 2 hours prior | 2026-08-22 14:00 | 621.76 | 622.00 | -0.24 |
| 6 hours prior | 2026-08-22 10:00 | 621.78 | 622.00 | -0.22 |
| 12 hours prior | 2026-08-22 04:00 | 621.78 | 622.00 | -0.22 |
| 24 hours prior | 2026-08-21 16:00 | 621.78 | 622.00 | -0.22 |
| 48 hours prior | 2026-08-20 16:00 | 621.81 | 622.00 | -0.19 |
*
Data is provisional and subject to revision.
Additional Information
| Impoundment date | 1968-01-01 |
| Vertical datum | NGVD29 |
| Dead pool elevation | 515.00 ft above NGVD29 |
| Emergency spillway crest elevation | 666.00 ft above NGVD29 |
| Flood pool elevation | 666.00 ft above NGVD29 |
| Maximum design elevation | 693.20 ft above NGVD29 |
| Top of dam elevation | 698.00 ft above NGVD29 |
| Conservation pool elevation | 622.00 ft above NGVD29 |
| Data download (CSV) | period of record, last one year, last 30 days |
Elevation-Area-Capacity Curves
1968-01-01 (source: USGS)
1995-05-01 (source: TWDB)
: GIS Data
2005-05-01 (source: TWDB)
: GIS Data
2015-12-01 (source: TWDB)
: GIS Data
|
|
| Data Source | USGS:08104050 |
| USGS Monitoring Location | USGS:08104050 |
Lake Location
