Reservoir · Missouri · United States · USACE CWMS
Mark Twain Pool
87.8% full
Capacity
642.23 hm³
Volume stored
564 hm³
Vs month average
96% of normal
Coordinates
39.525°N, 91.644°W
Last updated
2026-10-28
Current fill
87.8%vs 7 days ago
-1.2 pplosing
vs 1 year ago
N/A7-day trend
↓falling
Drought context
Storage vs October average
96%of normal
87.8% full on 2026-10-28, against an average of 91.6% for October across 2 years of readings (-3.8 points).
Drought Monitor at this site · 20 October 2026
D0abnormally dry
The ground at Mark Twain Pool's coordinates falls inside the D0 area of the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Missouri drought figures →
Data source: USACE CWMS — US Army Corps of Engineers — daily reservoir storage volume. Capacity is the design (normal full-pool) capacity from the US National Inventory of Dams (NID); fill % = current volume ÷ design capacity. Last reading: 2026-10-28.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 39.525°N, 91.644°W · Open in Google Maps
About Mark Twain Pool
As of October 28, 2026, Mark Twain Pool is filled to 87.8% of its total capacity, holding 564.1 hm³ of water out of a maximum 642.23 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has fallen by 1.2 percentage points.
Across the readings we hold for Mark Twain Pool — 176 data points between October 29, 2021 and October 28, 2026 — the level has ranged from a low of 87.8% (October 28, 2026) to a high of 105.0% (November 24, 2021). On average the reservoir is fullest around November and at its lowest around September.
It is operated by USACE primarily for multiple purposes. It is at 39.525°N, 91.644°W.
Key facts
- Current fill level
- 87.8% of total capacity
- Water stored
- 564.1 hm³
- Total capacity
- 642.23 hm³
- 7-day change
- ▼ 1.2 pp
- Primary use
- Multipurpose
- Operator
- USACE
- Coordinates
- 39.525°N, 91.644°W
- Last updated
- October 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Oct 2026 | 87.8% | 564.1 |
| 27 Oct 2026 | 87.9% | 564.7 |
| 26 Oct 2026 | 88.1% | 565.69 |
| 25 Oct 2026 | 88.3% | 567.09 |
| 24 Oct 2026 | 88.4% | 567.49 |
| 23 Oct 2026 | 88.6% | 568.88 |
| 22 Oct 2026 | 88.8% | 570.08 |
| 21 Oct 2026 | 89.0% | 571.88 |
| 20 Oct 2026 | 89.4% | 574.27 |
| 19 Oct 2026 | 89.6% | 575.67 |
| 18 Oct 2026 | 89.6% | 575.67 |
| 17 Oct 2026 | 89.6% | 575.67 |