Stillhouse Hollow Lake: 100.0% full as of 2026-08-13

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 2026-08-13 100.0 622.01 229,946 229,796 229,796 6,431
Yesterday 2026-08-12 100.0 622.04 230,139 229,796 229,796 6,435
2 days ago 2026-08-11 100.0 622.07 230,332 229,796 229,796 6,440
1 week ago 2026-08-06 100.0 622.19 231,106 229,796 229,796 6,457
1 month ago 2026-07-13 100.0 622.93 235,923 229,796 229,796 - n.a. -
3 months ago 2026-05-13 100.0 622.80 235,071 229,796 229,796 - n.a. -
6 months ago 2026-02-13 95.2 620.26 218,909 218,823 229,796 6,190
1 year ago 2025-08-13 100.0 623.11 237,107 229,796 229,796 - 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 2026-08-13 07:00 622.01 622.00 0.01 into flood pool
1 hour prior 2026-08-13 06:00 622.01 622.00 0.01 into flood pool
2 hours prior 2026-08-13 05:00 622.01 622.00 0.01 into flood pool
6 hours prior 2026-08-13 01:00 622.02 622.00 0.02 into flood pool
12 hours prior 2026-08-12 19:00 622.03 622.00 0.03 into flood pool
24 hours prior 2026-08-12 07:00 622.05 622.00 0.05 into flood pool
48 hours prior 2026-08-11 07:00 622.07 622.00 0.07 into flood pool
*

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