State · United States · USGS · BOR · USACE · CDEC
Iowa
100.6% average fill
Measured
3
Volume stored
361 hm³
Measured capacity
359 hm³
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Reservoirs
Sorted by capacityLake Red Rock Pool
Updated 2026-07-30
Saylorville Lake Reservoir
Updated 2026-07-30
Coralville Lake Reservoir MET Station
Updated 2026-07-30
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 July 30, 2026, the reservoirs we track across Iowa that report live levels hold roughly 361 hm³ of water — about 100.6% of their combined capacity. Taken together, Iowa's reservoirs are effectively full.
None of the tracked reservoirs are currently at critically low levels. Lake Red Rock Pool is the fullest at 104.0%, while Saylorville Lake Reservoir is the lowest at 93.8%.
Storage figures for Iowa come from USGS · USACE · BOR · CDEC; the most recent reading is from July 30, 2026. Each reservoir below links to its own page with full history and seasonal context.
Iowa at a glance
- Reservoirs tracked
- 3
- Average fill
- 100.6%
- Water stored
- 361 hm³
- Combined capacity
- 359 hm³
- Fullest
- Lake Red Rock Pool (104.0%)
- Lowest
- Saylorville Lake Reservoir (93.8%)
- Last updated
- July 30, 2026
Frequently asked questions
How full are reservoirs in Iowa right now?
As of July 30, 2026, the reservoirs tracked in Iowa that report live levels are 100.6% full overall, holding about 361 hm³ of water.
How many reservoirs are there in Iowa?
reservoirs.earth tracks 3 reservoirs in Iowa, with a combined storage capacity of 359 hm³.
Which reservoir in Iowa is the fullest?
Lake Red Rock Pool is currently the fullest reservoir in Iowa, at 104.0% of capacity.
Which reservoir in Iowa is the lowest?
Saylorville Lake Reservoir is currently the lowest in Iowa, at 93.8% 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 July 30, 2026.