Lewis and Clark Lake Water Level Today
South Dakota · near Yankton · In the flood pool
- Elevation
- 1,207.51 ft
- From full pool
- +3.01 ft
- Percent of pool
- n/a
- 24-hour change
- +0.03 ft
- 7-day change
- +0.44 ft
- Reading
- Sep 21, 2026 · USACE
Last year at Lewis and Clark Lake
Lewis and Clark Lake is 3.01 ft above full pool, at 1,207.51 ft, in its flood pool, up 0.03 ft in the last 24 hours. The top of the flood pool is 2.5 ft higher, at 1,210.00 ft.
Over the last 7 days the level rose 0.44 ft, and over 30 days it rose 0.90 ft. In the 400 days of readings on this page the high was 1,208.26 ft on Dec 18, 2025 and the low was 1,205.73 ft on May 11, 2026, a range of 2.53 ft.
The reading is the U.S. Army Corps of Engineers gauge at Gavins Point Dam & Reservoir, near Yankton, 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.
Lewis and Clark Lake pool elevations
| Current elevation | 1,207.51 ft |
|---|---|
| Full pool (top of conservation) | 1,204.50 ft |
| Top of flood pool | 1,210.00 ft |
| Top of dam | 1,234.00 ft |
| Inflow | 27,000 cfs |
| Outflow | 27,010 cfs |
| 30-day change | +0.90 ft |
| 1-year high | 1,208.26 ft (Dec 18, 2025) |
| 1-year low | 1,205.73 ft (May 11, 2026) |
| Vertical datum | NGVD29 |
| Operating agency | U.S. Army Corps of Engineers, NWDM district |
Source: U.S. Army Corps of Engineers. Read what full pool and flood pool mean.
More lakes in South Dakota
- Lake Oahe 1,592.17 ft, −15.33 ft from full
- Lake Francis Case 1,353.60 ft, +3.60 ft from full
- Lake Sharpe 1,420.87 ft, +0.87 ft from full
- Cold Brook Reservoir 3,585.27 ft, +0.27 ft from full
- Cottonwood Springs Reservoir 3,848.73 ft, −26.27 ft from full
- Pactola Reservoir 4,558.11 ft, −22.09 ft from full
Lewis and Clark Lake level questions
What is the water level of Lewis and Clark Lake today?
Lewis and Clark Lake is at 1,207.51 ft as of Sep 21, 2026, +3.01 ft relative to full pool (1,204.50 ft). The 24-hour change is +0.03 ft.
What is full pool at Lewis and Clark Lake?
Full pool, the top of the conservation pool, is 1,204.50 ft (NGVD29). Above that, water is stored temporarily in the flood pool up to 1,210.00 ft.
Is Lewis and Clark Lake rising or falling?
Over the last 24 hours the level is +0.03 ft; over 7 days it rose 0.44 ft, and over 30 days it rose 0.90 ft.
Where does this Lewis and Clark Lake level come from?
From the U.S. Army Corps of Engineers (USACE) public data feed for Gavins Point Dam & Reservoir. Lake Levels Today republishes the agency's daily value without adjustment and links to the source below.