Cooper (Chapman) Lake
Source: Texas Water Development Board (Water Data for Texas)
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Level history
Field notes
On Oct 25, 2026, Cooper (Chapman) Lake was at 434.36 ft, which is 64.4% of its conservation capacity.
That is 5.64 ft below the conservation (full) pool elevation of 440.00 ft.
Over the past 7 days the lake has been falling (−0.25 ft), and it is −0.86 ft over 30 days.
Compared with a year ago (436.90 ft), the lake is 2.54 ft lower.
For this time of year, the median in TWDB's records (1996–2025, 30 years with data) is 80.2% full, so Jim Chapman is currently below normal by 15.8 percentage points.
In TWDB's dataset (since 2000), the highest level recorded is 448.51 ft (Mar 2, 2018) and the lowest is 422.02 ft (Dec 28, 2006). Older records may be monthly rather than daily.
Lake facts
| Full pool (conservation) | 440.00 ft |
|---|---|
| Dead pool | 415.50 ft |
| Conservation storage | 166,606 ac-ft |
| Conservation capacity | 258,723 ac-ft |
| Total storage (latest) | 202,381 ac-ft |
| Surface area | 14,507 acres |
| Record high (TWDB data) | 448.51 ft · Mar 2, 2018 |
| Record low (TWDB data) | 422.02 ft · Dec 28, 2006 |
| Typical % full now | 80.2% (median 1996–2025) |
| Gauge location | 33.3334, -95.6252 |
| Groups | Sulphur River Basin North East Texas (Region D) Water Planning Area |
Nearby lakes
Common questions
Is Cooper (Chapman) Lake full right now?
No – as of Oct 25, 2026 it is 64.4% full according to TWDB.
What is full pool for Cooper (Chapman) Lake?
The conservation pool elevation used by TWDB is 440.00 ft. The lake is currently 5.64 ft below it.
Is Cooper (Chapman) Lake rising or falling?
Over the last 7 days it changed −0.25 ft and over 30 days −0.86 ft.
How often is this page updated?
The page is rebuilt automatically every day from TWDB's published data. Values can be revised later by the source agency.
Where does the data come from?
Water Data for Texas, run by the Texas Water Development Board, which compiles gauge readings from USGS, USACE, river authorities and others. Forecasts come from the National Weather Service.
Values are TWDB daily estimates; elevations in feet above the vertical datum stated by TWDB. TWDB disclaimer: reservoir data are best estimates generated by the Texas Water Development Board from data collected by various providers; TWDB makes no warranties as to their fitness for any purpose. See data sources.