Stillhouse Hollow Lake: 97.5% full as of 2026-09-18
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 | 2026-09-18 | 97.5 | 621.09 | 224,091 | 224,005 | 229,796 | 6,298 |
| Yesterday | 2026-09-17 | 97.5 | 621.11 | 224,217 | 224,131 | 229,796 | 6,301 |
| 2 days ago | 2026-09-16 | 97.6 | 621.14 | 224,406 | 224,320 | 229,796 | 6,305 |
| 1 week ago | 2026-09-11 | 98.0 | 621.28 | 225,290 | 225,204 | 229,796 | 6,325 |
| 1 month ago | 2026-08-18 | 99.6 | 621.87 | 229,047 | 228,961 | 229,796 | 6,411 |
| 3 months ago | 2026-06-18 | 100.0 | 624.71 | 247,836 | 229,796 | 229,796 | - n.a. - |
| 6 months ago | 2026-03-18 | 93.7 | 619.69 | 215,401 | 215,315 | 229,796 | 6,116 |
| 1 year ago | 2025-09-18 | 100.0 | 622.10 | 230,525 | 229,796 | 229,796 | 6,444 |
*
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 | 2026-09-18 11:00 | 621.07 | 622.00 | -0.93 |
| 1 hour prior | 2026-09-18 10:00 | 621.07 | 622.00 | -0.93 |
| 2 hours prior | 2026-09-18 09:00 | 621.08 | 622.00 | -0.92 |
| 6 hours prior | 2026-09-18 05:00 | 621.08 | 622.00 | -0.92 |
| 12 hours prior | 2026-09-17 23:00 | 621.09 | 622.00 | -0.91 |
| 24 hours prior | 2026-09-17 11:00 | 621.11 | 622.00 | -0.89 |
| 48 hours prior | 2026-09-16 11:00 | 621.14 | 622.00 | -0.86 |
*
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
