State · United States · USGS · BOR · USACE · CDEC
Iowa
75.8% average fill
Measured
4
Volume stored
644 hm³
Measured capacity
850 hm³
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Reservoirs
Sorted by capacityRathbun Dam & Reservoir
Updated 2026-09-14
Lake Red Rock Pool
Updated 2026-09-14
Saylorville Lake Reservoir
Updated 2026-09-14
Coralville Lake Reservoir MET Station
Updated 2026-09-14
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 September 14, 2026, the reservoirs we track across Iowa that report live levels hold roughly 644 hm³ of water — about 75.8% of their combined capacity. Taken together, Iowa's reservoirs are within their normal operating range.
None of the tracked reservoirs are currently at critically low levels. Coralville Lake Reservoir MET Station is the fullest at 104.1%, while Lake Red Rock Pool is the lowest at 65.8%.
Over the most recent week on record, 3 reservoirs rose across Iowa.
Storage figures for Iowa come from USGS · USACE · BOR · CDEC; the most recent reading is from September 14, 2026. Each reservoir below links to its own page with full history and seasonal context.
Iowa at a glance
- Reservoirs tracked
- 4
- Average fill
- 75.8%
- Water stored
- 644 hm³
- Combined capacity
- 850 hm³
- Fullest
- Coralville Lake Reservoir MET Station (104.1%)
- Lowest
- Lake Red Rock Pool (65.8%)
- Last updated
- September 14, 2026