Stillhouse Hollow Lake: 95.8% full as of 2026-01-11

The elevation-storage rating curve used to produce the storage hydrograph is made of two segments: (1) the segment up to the conservation pool top (below the red line) is based on measured data, and (2) the segment in the flood pool (above the red line) is an extrapolation from the first segment and shouldn't be relied upon for flood storage information.

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 2026-01-11 95.8 620.47 220,212 220,126 229,796 6,217
Yesterday 2026-01-10 95.8 620.49 220,336 220,250 229,796 6,219
2 days ago 2026-01-09 95.9 620.51 220,460 220,374 229,796 6,222
1 week ago 2026-01-04 96.1 620.58 220,896 220,810 229,796 6,231
1 month ago 2025-12-11 97.3 621.02 223,650 223,564 229,796 6,288
3 months ago 2025-10-11 99.4 621.79 228,534 228,448 229,796 6,399
6 months ago 2025-07-11 100.0 625.90 256,055 229,796 229,796 - n.a. -
1 year ago 2025-01-11 93.3 619.53 214,425 214,339 229,796 6,095
*

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 2026-01-11 00:00 620.47 622.00 -1.53 below flood pool
1 hour prior 2026-01-10 23:00 620.47 622.00 -1.53 below flood pool
2 hours prior 2026-01-10 22:00 620.47 622.00 -1.53 below flood pool
6 hours prior 2026-01-10 18:00 620.47 622.00 -1.53 below flood pool
12 hours prior 2026-01-10 12:00 620.49 622.00 -1.51 below flood pool
24 hours prior 2026-01-10 00:00 620.51 622.00 -1.49 below flood pool
48 hours prior 2026-01-09 00:00 620.52 622.00 -1.48 below 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

Lake Location