Stillhouse Hollow Lake: 97.9% full as of 2026-09-11
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 | 2026-09-11 | 97.9 | 621.26 | 225,163 | 225,077 | 229,796 | 6,322 |
| Yesterday | 2026-09-10 | 98.0 | 621.28 | 225,290 | 225,204 | 229,796 | 6,325 |
| 2 days ago | 2026-09-09 | 98.1 | 621.31 | 225,480 | 225,394 | 229,796 | 6,330 |
| 1 week ago | 2026-09-04 | 98.4 | 621.42 | 226,177 | 226,091 | 229,796 | 6,346 |
| 1 month ago | 2026-08-11 | 100.0 | 622.07 | 230,332 | 229,796 | 229,796 | 6,440 |
| 3 months ago | 2026-06-11 | 100.0 | 625.02 | 249,957 | 229,796 | 229,796 | - n.a. - |
| 6 months ago | 2026-03-11 | 94.3 | 619.92 | 216,812 | 216,726 | 229,796 | 6,146 |
| 1 year ago | 2025-09-11 | 100.0 | 622.18 | 231,041 | 229,796 | 229,796 | 6,455 |
*
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 | 2026-09-11 22:00 | 621.34 | 622.00 | -0.66 |
| 1 hour prior | 2026-09-11 21:00 | 621.34 | 622.00 | -0.66 |
| 2 hours prior | 2026-09-11 20:00 | 621.32 | 622.00 | -0.68 |
| 6 hours prior | 2026-09-11 16:00 | 621.25 | 622.00 | -0.75 |
| 12 hours prior | 2026-09-11 10:00 | 621.26 | 622.00 | -0.74 |
| 24 hours prior | 2026-09-10 22:00 | 621.27 | 622.00 | -0.73 |
| 48 hours prior | 2026-09-09 22:00 | 621.30 | 622.00 | -0.70 |
*
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
