State · United States · USGS · BOR · USACE · CDEC
Ohio
96.6% average fill
Measured
8
Data pending
22
Volume stored
543 hm³
Measured capacity
562 hm³
Low level
1
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Reservoirs
Sorted by capacityCaesar Creek Lake
Updated 2026-06-11
William H. Harsha Lake
Updated 2026-06-11
Mosquito Creek Lake, OH
Updated 2026-06-12
Berlin Lake, OH
Updated 2026-06-12
Michael J Kirwan Reservoir, OH
Updated 2026-06-12
C. J. Brown Dam and Reservoir
Updated 2026-06-11
Lake Milton, OH
Updated 2026-06-12
West Fork of Mill Creek Lake
lowUpdated 2026-06-11
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
22 major reservoirs — 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: Alum Creek Lake (0.1 km³), Atwood Lake (0.0 km³), Beach City Lake (0.1 km³), Bolivar Lake (0.2 km³), Charles Mill Lake (0.1 km³), Clendening Lake (0.0 km³), Deer Creek Lake (0.0 km³), Delaware Lake (0.0 km³), Dillon Lake (0.1 km³), Dover Lake (0.3 km³), Leesville Lake (0.0 km³), Mohawk (0.4 km³), Mohicanville Dam (0.1 km³), North Br Kokosing River Lake (0.0 km³), Paint Creek Lake (0.1 km³), Piedmont Lake (0.0 km³), Pleasant Hill Lake (0.0 km³), Senecaville Lake (0.1 km³), Tappan Lake (0.0 km³), Tom Jenkins Lake (0.0 km³), Wills Creek Lake (0.0 km³), JE Roush Lake (0.2 km³).
Alum Creek Lake
SourcingAtwood Lake
SourcingBeach City Lake
SourcingBolivar Lake
SourcingCharles Mill Lake
SourcingClendening Lake
SourcingDeer Creek Lake
SourcingDelaware Lake
SourcingDillon Lake
SourcingDover Lake
SourcingLeesville Lake
SourcingMohawk
SourcingMohicanville Dam
SourcingNorth Br Kokosing River Lake
SourcingPaint Creek Lake
SourcingPiedmont Lake
SourcingPleasant Hill Lake
SourcingSenecaville Lake
SourcingTappan Lake
SourcingTom Jenkins Lake
SourcingWills Creek Lake
SourcingJE Roush Lake
SourcingAbout reservoirs in Ohio
As of June 12, 2026, the reservoirs we track across Ohio that report live levels hold roughly 543 hm³ of water — about 96.6% of their combined capacity. Taken together, Ohio's reservoirs are high.
Across the region, 1 is low. C. J. Brown Dam and Reservoir is the fullest at 101.1%, while West Fork of Mill Creek Lake is the lowest at 21.2%.
Storage figures for Ohio come from USGS · USACE · BOR · CDEC; the most recent reading is from June 12, 2026. Each reservoir below links to its own page with full history and seasonal context.
Ohio at a glance
- Reservoirs tracked
- 8
- Average fill
- 96.6%
- Water stored
- 543 hm³
- Combined capacity
- 562 hm³
- Fullest
- C. J. Brown Dam and Reservoir (101.1%)
- Lowest
- West Fork of Mill Creek Lake (21.2%)
- Last updated
- June 12, 2026
Frequently asked questions
How full are reservoirs in Ohio right now?
As of June 12, 2026, the reservoirs tracked in Ohio that report live levels are 96.6% full overall, holding about 543 hm³ of water.
How many reservoirs are there in Ohio?
reservoirs.earth tracks 8 reservoirs in Ohio, with a combined storage capacity of 562 hm³.
Which reservoir in Ohio is the fullest?
C. J. Brown Dam and Reservoir is currently the fullest reservoir in Ohio, at 101.1% of capacity.
Which reservoir in Ohio is the lowest?
West Fork of Mill Creek Lake is currently the lowest in Ohio, at 21.2% 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 June 12, 2026.