Reservoir · Missouri · United States · USACE CWMS
Mark Twain Pool
29.2% full
Capacity
2,296.74 hm³
Volume stored
671 hm³
Coordinates
39.525°N, 91.644°W
Last updated
2026-05-27
Current fill
29.2%vs 7 days ago
0.0%stable
vs 1 year ago
-5.4%year-over-year
7-day trend
→stable
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: 2026-05-27.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 39.525, -91.644 · Open in Google Maps
About Mark Twain Pool
As of May 27, 2026, Mark Twain Pool is filled to 29.2% of its total capacity, holding roughly 671 hm³ of water out of a maximum 2,297 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it is 5.4 points below its level on the same date a year earlier.
Across the readings we hold for Mark Twain Pool — 210 data points between June 13, 2021 and May 27, 2026 — the level has ranged from a low of 22.6% (March 6, 2026) to a high of 56.0% (July 16, 2021). On average the reservoir is fullest around July and at its lowest around February.
It is operated by USACE primarily for multiple purposes. It lies within the Missouri basin at 39.525°N, 91.644°W.
Key facts
- Current fill level
- 29.2%
- Water stored
- 671 hm³
- Total capacity
- 2,297 hm³
- 7-day change
- No change
- Year-on-year
- ▼ 5.4 pts
- Primary use
- Multipurpose
- River basin
- Missouri
- Operator
- USACE
- Coordinates
- 39.525°N, 91.644°W
- Last updated
- May 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 May 2026 | 29.2% | 671 |
| 26 May 2026 | 29.2% | 671 |
| 25 May 2026 | 29.4% | 675 |
| 24 May 2026 | 29.7% | 683 |
| 23 May 2026 | 30.1% | 692 |
| 22 May 2026 | 30.4% | 698 |
| 21 May 2026 | 30.7% | 705 |
| 20 May 2026 | 30.9% | 709 |
| 19 May 2026 | 30.2% | 693 |
| 18 May 2026 | 29.7% | 681 |
| 17 May 2026 | 29.8% | 684 |
| 16 May 2026 | 29.9% | 688 |
Frequently asked questions
What is the current water level of Mark Twain Pool?
As of May 27, 2026, Mark Twain Pool is at 29.2% of its capacity, holding approximately 671 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Mark Twain Pool reservoir full?
No. As of May 27, 2026, Mark Twain Pool is low at 29.2% of its capacity, so it is not full.
Is the water level at Mark Twain Pool rising or falling?
The level at Mark Twain Pool has been broadly stable over the latest week on record (0.0 points).
How much water can Mark Twain Pool hold?
Mark Twain Pool has a total capacity of 2,297 hm³.
Where is Mark Twain Pool reservoir located?
Mark Twain Pool is located in Missouri, United States, within the Missouri basin (coordinates 39.525°N, 91.644°W).
What is Mark Twain Pool used for?
Mark Twain Pool is used primarily for multiple purposes, and is managed by USACE.