Jim Chapman Lake Water Level Today
Texas · near Cooper, TX · Below full pool
- Elevation
- 435.40 ft
- From full pool
- −4.60 ft
- Percent of pool
- 90.0%
- 24-hour change
- −0.05 ft
- 7-day change
- −0.34 ft
- Reading
- Sep 21, 2026 · USACE
Last year at Jim Chapman Lake
Jim Chapman Lake is 4.60 ft below full pool, at 435.40 ft, down 0.05 ft in the last 24 hours. That puts the lake at 90.0 percent of its conservation pool. The top of the flood pool is 10.8 ft higher, at 446.20 ft.
Over the last 7 days the level fell 0.34 ft, and over 30 days it fell 1.29 ft. In the 400 days of readings on this page the high was 439.07 ft on Aug 18, 2025 and the low was 435.07 ft on Feb 14, 2026, a range of 4.00 ft.
The reading is the U.S. Army Corps of Engineers gauge, near Cooper, TX, taken Sep 21, 2026 and referenced to the NGVD29 datum. This page is rebuilt once a day from the agency feed; it is not a live gauge, so during a fast rise or a scheduled release check the USACE page for hourly values.
Jim Chapman Lake pool elevations
| Current elevation | 435.40 ft |
|---|---|
| Full pool (top of conservation) | 440.00 ft |
| Top of flood pool | 446.20 ft |
| Bottom of conservation pool | 394.00 ft |
| Top of dam | 464.50 ft |
| Inflow | -181 cfs |
| Outflow | 5 cfs |
| 30-day change | −1.29 ft |
| 1-year high | 439.07 ft (Aug 18, 2025) |
| 1-year low | 435.07 ft (Feb 14, 2026) |
| Vertical datum | NGVD29 |
| Operating agency | U.S. Army Corps of Engineers, SWF district |
Source: U.S. Army Corps of Engineers. Read what full pool and flood pool mean.
More lakes in Texas
- Canyon Lake 908.33 ft, −0.67 ft from full
- Lake Travis 675.59 ft, −5.41 ft from full
- Lake Texoma 615.33 ft, −1.17 ft from full
- Medina Lake 1,020.96 ft, −43.24 ft from full
- Lake Buchanan 1,018.51 ft, −1.49 ft from full
- Elephant Butte Lake 4,275.92 ft, −129.67 ft from full
Jim Chapman Lake level questions
What is the water level of Jim Chapman Lake today?
Jim Chapman Lake is at 435.40 ft as of Sep 21, 2026, −4.60 ft relative to full pool (440.00 ft). The 24-hour change is −0.05 ft.
What is full pool at Jim Chapman Lake?
Full pool, the top of the conservation pool, is 440.00 ft (NGVD29). Above that, water is stored temporarily in the flood pool up to 446.20 ft. The bottom of the conservation pool is 394.00 ft.
Is Jim Chapman Lake rising or falling?
Over the last 24 hours the level is −0.05 ft; over 7 days it fell 0.34 ft, and over 30 days it fell 1.29 ft.
Where does this Jim Chapman Lake level come from?
From the U.S. Army Corps of Engineers (USACE) public data feed for Jim Chapman Lake. Lake Levels Today republishes the agency's daily value without adjustment and links to the source below.