Stillhouse Hollow Lake: 100.0% full as of 2026-07-30
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 | 2026-07-30 | 100.0 | 622.70 | 234,417 | 229,796 | 229,796 | - n.a. - |
| Yesterday | 2026-07-29 | 100.0 | 622.75 | 234,744 | 229,796 | 229,796 | - n.a. - |
| 2 days ago | 2026-07-28 | 100.0 | 622.82 | 235,202 | 229,796 | 229,796 | - n.a. - |
| 1 week ago | 2026-07-23 | 100.0 | 623.14 | 237,305 | 229,796 | 229,796 | - n.a. - |
| 1 month ago | 2026-06-30 | 100.0 | 623.65 | 240,687 | 229,796 | 229,796 | - n.a. - |
| 3 months ago | 2026-04-30 | 99.0 | 621.65 | 227,640 | 227,554 | 229,796 | 6,379 |
| 6 months ago | 2026-01-30 | 95.7 | 620.45 | 220,087 | 220,001 | 229,796 | 6,214 |
| 1 year ago | 2025-07-30 | 100.0 | 625.03 | 250,026 | 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 | 2026-07-30 15:00 | 622.67 | 622.00 | 0.67 |
| 1 hour prior | 2026-07-30 14:00 | 622.67 | 622.00 | 0.67 |
| 2 hours prior | 2026-07-30 13:00 | 622.68 | 622.00 | 0.68 |
| 6 hours prior | 2026-07-30 09:00 | 622.69 | 622.00 | 0.69 |
| 12 hours prior | 2026-07-30 03:00 | 622.70 | 622.00 | 0.70 |
| 24 hours prior | 2026-07-29 15:00 | 622.73 | 622.00 | 0.73 |
| 48 hours prior | 2026-07-28 15:00 | 622.81 | 622.00 | 0.81 |
*
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
