Thief Valley Reservoir

As of September 30, 2026, Thief Valley Reservoir is filled to 0.0% of its total capacity, holding roughly 0 hm³ of water out of a maximum 16 hm³. At this level the reservoir is critically low.

Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it is 6.2 points below its level on the same date a year earlier.

Across the readings we hold for Thief Valley Reservoir — 2188 data points between October 2, 2021 and September 30, 2026 — the level has ranged from a low of 0.0% (October 2, 2021) to a high of 105.0% (June 6, 2022). On average the reservoir is fullest around April and at its lowest around September.

It is operated by BOR primarily for multiple purposes. It lies within the Oregon basin at 45.013°N, 117.781°W.