Reservoir · Iowa · United States · USACE CWMS
Rathbun Dam & Reservoir
105.0% full
Capacity
253.31 hm³
Volume stored
325 hm³
Coordinates
40.826°N, 92.887°W
Last updated
2026-06-11
Current fill
105.0%vs 7 days ago
0.0%stable
vs 1 year ago
0.0%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: 2026-06-11.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 40.826, -92.887 · Open in Google Maps
About Rathbun Dam & Reservoir
As of June 11, 2026, Rathbun Dam & Reservoir is filled to 105.0% of its total capacity, holding roughly 325 hm³ of water out of a maximum 253 hm³. At this level the reservoir is effectively full.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Rathbun Dam & Reservoir — 274 data points between June 15, 2023 and June 11, 2026 — the level has ranged from a low of 100.2% (December 21, 2023) to a high of 105.0% (June 15, 2023). On average the reservoir is fullest around April and at its lowest around December.
It is operated by USACE primarily for multiple purposes. It lies within the Iowa basin at 40.826°N, 92.887°W.
Key facts
- Current fill level
- 105.0%
- Water stored
- 325 hm³
- Total capacity
- 253 hm³
- 7-day change
- No change
- Year-on-year
- No change
- Primary use
- Multipurpose
- River basin
- Iowa
- Operator
- USACE
- Coordinates
- 40.826°N, 92.887°W
- Last updated
- June 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Jun 2026 | 105.0% | 325 |
| 10 Jun 2026 | 105.0% | 303 |
| 9 Jun 2026 | 105.0% | 304 |
| 8 Jun 2026 | 105.0% | 306 |
| 7 Jun 2026 | 105.0% | 306 |
| 6 Jun 2026 | 105.0% | 303 |
| 5 Jun 2026 | 105.0% | 295 |
| 4 Jun 2026 | 105.0% | 294 |
| 3 Jun 2026 | 105.0% | 296 |
| 2 Jun 2026 | 105.0% | 298 |
| 1 Jun 2026 | 105.0% | 302 |
| 31 May 2026 | 105.0% | 304 |
Frequently asked questions
What is the current water level of Rathbun Dam & Reservoir?
As of June 11, 2026, Rathbun Dam & Reservoir is at 105.0% of its capacity, holding approximately 325 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Rathbun Dam & Reservoir reservoir full?
Rathbun Dam & Reservoir is essentially full, sitting at 105.0% of capacity as of June 11, 2026.
Is the water level at Rathbun Dam & Reservoir rising or falling?
The level at Rathbun Dam & Reservoir has been broadly stable over the latest week on record (0.0 points).
How much water can Rathbun Dam & Reservoir hold?
Rathbun Dam & Reservoir has a total capacity of 253 hm³.
Where is Rathbun Dam & Reservoir reservoir located?
Rathbun Dam & Reservoir is located in Iowa, United States, within the Iowa basin (coordinates 40.826°N, 92.887°W).
What is Rathbun Dam & Reservoir used for?
Rathbun Dam & Reservoir is used primarily for multiple purposes, and is managed by USACE.