State · United States · USGS · BOR · USACE · CDEC
Iowa
108.5% average fill
Measured
4
Volume stored
665 hm³
Measured capacity
612 hm³
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Reservoirs
Sorted by capacityRathbun Dam & Reservoir
Updated 2026-06-11
Lake Red Rock Pool
Updated 2026-05-27
Saylorville Lake Reservoir
Updated 2026-05-27
Coralville Lake Reservoir MET Station
Updated 2026-05-27
Storage from official US gauges (USGS, USACE, Bureau of Reclamation, CDEC). Fill % uses design capacity from the National Inventory of Dams where available; a few sites without a match fall back to the 5-year maximum.
About reservoirs in Iowa
As of June 11, 2026, the reservoirs we track across Iowa that report live levels hold roughly 665 hm³ of water — about 108.5% of their combined capacity. Taken together, Iowa's reservoirs are effectively full.
None of the tracked reservoirs are currently at critically low levels. Rathbun Dam & Reservoir is the fullest at 105.0%, while Lake Red Rock Pool is the lowest at 93.2%.
Storage figures for Iowa come from USGS · USACE · BOR · CDEC; the most recent reading is from June 11, 2026. Each reservoir below links to its own page with full history and seasonal context.
Iowa at a glance
- Reservoirs tracked
- 4
- Average fill
- 108.5%
- Water stored
- 665 hm³
- Combined capacity
- 612 hm³
- Fullest
- Rathbun Dam & Reservoir (105.0%)
- Lowest
- Lake Red Rock Pool (93.2%)
- Last updated
- June 11, 2026
Frequently asked questions
How full are reservoirs in Iowa right now?
As of June 11, 2026, the reservoirs tracked in Iowa that report live levels are 108.5% full overall, holding about 665 hm³ of water.
How many reservoirs are there in Iowa?
reservoirs.earth tracks 4 reservoirs in Iowa, with a combined storage capacity of 612 hm³.
Which reservoir in Iowa is the fullest?
Rathbun Dam & Reservoir is currently the fullest reservoir in Iowa, at 105.0% of capacity.
Which reservoir in Iowa is the lowest?
Lake Red Rock Pool is currently the lowest in Iowa, at 93.2% of capacity.
Where does the reservoir data for Iowa come from?
All storage figures for Iowa come from USGS · USACE · BOR · CDEC, an official source, last updated June 11, 2026.