State · United States · USGS · BOR · USACE · CDEC
Iowa
67% average fill
Measured
4
Volume stored
751 hm³
Measured capacity
1,122 hm³
Below month average
2 of 4
Loading map…
Drought Monitor · 27 October 2026
Weekly map · area in each categoryDrought status
0.0%
of the area in drought (D1 or worse)
Worst category: D0 abnormally dry
unchanged on the week
Severe or worse (D2+)
0.0%
Extreme or worse (D3+)
0.0%
DSCI
10–500
Reservoirs (reservoirs.earth)
67.0% full4 tracked
Reservoirs on drought ground
0 of 4
As of the 27 October 2026 U.S. Drought Monitor map, 0.0% of Iowa was in drought (D1 or worse). The 4 reservoirs we track in Iowa were 67.0% full on their latest readings. 0 of 4 tracked reservoir sites sit inside the drought area.
The Drought Monitor maps where conditions are dry this week — rainfall, soil moisture, streamflow — not how much water is stored. Reservoir storage lags it by months, so a region can be in drought with full reservoirs, or out of drought with empty ones. Source: droughtmonitor.unl.edu. The U.S. Drought Monitor is jointly produced by the National Drought Mitigation Center at the University of Nebraska-Lincoln, the United States Department of Agriculture, the National Oceanic and Atmospheric Administration and the National Aeronautics and Space Administration. Map courtesy of NDMC.
Reservoirs
Sorted by capacityLake Red Rock Pool
Updated 2026-10-29· 72% of month avg
Rathbun Dam & Reservoir
Updated 2026-10-29· 96% of month avg
Saylorville Lake Reservoir
Updated 2026-10-29· 101% of month avg
Coralville Lake Reservoir MET Station
Updated 2026-10-29· 106% of month avg
Storage from official US gauges (USGS, USACE, Bureau of Reclamation, CDEC) and, in Texas, the Texas Water Development Board. Fill % uses design capacity from the National Inventory of Dams where available; Water Data for Texas lakes use that board's conservation capacity; a few sites without a match fall back to the 5-year maximum. "% of month avg" compares the current fill with the reservoir’s own average for this calendar month over its readings on record. D0–D4 is the U.S. Drought Monitor category of the ground at the reservoir’s coordinates on the latest weekly map — local conditions, not storage.
About reservoirs in Iowa
As of October 29, 2026, the reservoirs we track across Iowa that report live levels hold roughly 751 hm³ of water — about 67.0% 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. Saylorville Lake Reservoir is the fullest at 97.6%, while Lake Red Rock Pool is the lowest at 49.0%.
Over the most recent week on record, 2 reservoirs rose and 1 reservoir fell across Iowa.
Storage figures for Iowa come from USGS · USACE · BOR · CDEC; the most recent reading is from October 29, 2026. Each reservoir below links to its own page with full history and seasonal context.
Iowa at a glance
- Reservoirs tracked
- 4
- Average fill
- 67.0%
- Water stored
- 751 hm³
- Combined capacity
- 1,122 hm³
- Fullest
- Saylorville Lake Reservoir (97.6%)
- Lowest
- Lake Red Rock Pool (49.0%)
- Last updated
- October 29, 2026