Mark Twain Lake
Source: U.S. Army Corps of Engineers (CWMS Data API)
S 3 mph · rain 0%
S 2 mph · rain 1%
Level history
Field notes
Mark Twain Lake's latest daily level (Oct 25, 2026) is 602.35 (NAVD88) ft.
That is 3.65 ft below the conservation (full) pool elevation of 606.00 ft.
Over the past 7 days the lake has been falling (−0.42 ft), and it is −0.43 ft over 30 days.
Compared with a year ago (601.17 ft), the lake is 1.18 ft higher.
Readings are the hourly pool elevation the U.S. Army Corps of Engineers publishes for Mark Twain Lake (Clarence Cannon Dam) on Salt River (MVS); changes compare readings at the same hour.
Lake facts
| Gauge / station | Mark Twain Lake (Clarence Cannon Dam) on Salt River (MVS) |
|---|---|
| Elevation datum | ft (NAVD88) |
| Gauge location | 39.5249, -91.6443 |
Reference levels
| Level · source | Elevation | Today vs level |
|---|---|---|
| Top of conservation pool USACE “Elevation - 0 Percent Flood Control” | 606.00 ft | −3.65 ft |
| Top of flood-control pool USACE “Elevation - 100 Percent Flood Control” | 638.00 ft | −35.65 ft |
| Top of inactive pool (minimum) USACE “Minimum Regulated” | 520.00 ft | +82.35 ft |
Only levels the agency publishes, or that we compute directly from its own records, are listed. “Today vs level” = latest reading minus the reference level. A level the source does not publish is left out rather than estimated.
Nearby lakes
Common questions
How full is Mark Twain Lake right now?
The Corps feed we use gives pool elevation, not percent full. On Oct 25, 2026 the lake was at 602.35 ft, 3.65 ft below the top of conservation pool of 606.00 ft.
How high can Mark Twain Lake go before flood storage is full?
The U.S. Army Corps of Engineers lists the top of the flood-control pool at 638.00 ft.
What is full pool at Mark Twain Lake?
The conservation (full) pool elevation published by the U.S. Army Corps of Engineers is 606.00 ft. The lake is currently 3.65 ft below it.
Is Mark Twain Lake rising or falling?
Over the last 7 days it changed −0.42 ft and over 30 days −0.43 ft.
How often is this page updated?
The page is rebuilt automatically every day from USACE's published data. Values can be revised later by the source agency.
Where does the data come from?
The U.S. Army Corps of Engineers' public CWMS Data API (cwms-data.usace.army.mil), which publishes pool elevations and the project's reference levels. Forecasts come from the National Weather Service.
Hourly pool elevation published by the U.S. Army Corps of Engineers; 7-day, 30-day and year-ago changes compare readings at the same hour. USACE data are provisional and subject to revision. This page is not affiliated with or endorsed by the U.S. Army Corps of Engineers. See data sources.