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.

Major reservoirs — data pending

⏳

JE Roush Lake — data sourcing in progress

Storage is monitored by the US Army Corps of Engineers (USACE CWMS), but the live feed is currently stale — we are working to restore it. Known capacities: JE Roush Lake (0.2 km³).

JE Roush Lake

Sourcing

Capacity: 189 hm³⏳ Pending

About reservoirs in Ohio

As of July 30, 2026, the reservoirs we track across Ohio that report live levels hold roughly 981 hm³ of water — about 66.2% of their combined capacity. Taken together, Ohio's reservoirs are within their normal operating range.

Across the region, 2 reservoirs are at critically low levels and 1 is low. Deer Creek Lake is the fullest at 104.2%, while Mohawk is the lowest at 0.4%.

Storage figures for Ohio 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.

Ohio at a glance

Reservoirs tracked: 26
Average fill: 66.2%
Water stored: 981 hm³
Combined capacity: 1,482 hm³
At critically low levels: 2
Fullest: Deer Creek Lake (104.2%)
Lowest: Mohawk (0.4%)
Last updated: July 30, 2026

Frequently asked questions

How full are reservoirs in Ohio right now?

As of July 30, 2026, the reservoirs tracked in Ohio that report live levels are 66.2% full overall, holding about 981 hm³ of water.

How many reservoirs are there in Ohio?

reservoirs.earth tracks 26 reservoirs in Ohio, with a combined storage capacity of 1,482 hm³.

Which reservoir in Ohio is the fullest?

Deer Creek Lake is currently the fullest reservoir in Ohio, at 104.2% of capacity.

Which reservoir in Ohio is the lowest?

Mohawk is currently the lowest in Ohio, at 0.4% of capacity.

Where does the reservoir data for Ohio come from?

All storage figures for Ohio come from USGS · USACE · BOR · CDEC, an official source, last updated July 30, 2026.

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