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 Oregon

As of July 28, 2026, the reservoirs we track across Oregon that report live levels hold roughly 865 hm³ of water — about 28.6% of their combined capacity. Taken together, Oregon's reservoirs are low.

Across the region, 6 reservoirs are at critically low levels and 11 are low. Crane Prairie Reservoir and Dam (CRA) is the fullest at 82.1%, while Thief Valley Reservoir and Dam (THF) is the lowest at 0.0%.

Storage figures for Oregon come from USGS · USACE · BOR · CDEC; the most recent reading is from July 28, 2026. Each reservoir below links to its own page with full history and seasonal context.

Oregon at a glance

Reservoirs tracked: 24
Average fill: 28.6%
Water stored: 865 hm³
Combined capacity: 3,026 hm³
At critically low levels: 6
Fullest: Crane Prairie Reservoir and Dam (CRA) (82.1%)
Lowest: Thief Valley Reservoir and Dam (THF) (0.0%)
Last updated: July 28, 2026

Frequently asked questions

How full are reservoirs in Oregon right now?

As of July 28, 2026, the reservoirs tracked in Oregon that report live levels are 28.6% full overall, holding about 865 hm³ of water.

How many reservoirs are there in Oregon?

reservoirs.earth tracks 24 reservoirs in Oregon, with a combined storage capacity of 3,026 hm³.

Which reservoir in Oregon is the fullest?

Crane Prairie Reservoir and Dam (CRA) is currently the fullest reservoir in Oregon, at 82.1% of capacity.

Which reservoir in Oregon is the lowest?

Thief Valley Reservoir and Dam (THF) is currently the lowest in Oregon, at 0.0% of capacity.

Where does the reservoir data for Oregon come from?

All storage figures for Oregon come from USGS · USACE · BOR · CDEC, an official source, last updated July 28, 2026.

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