Cle Elum Lake

As of September 30, 2026, Cle Elum Lake is filled to 6.4% of its total capacity, holding roughly 34 hm³ of water out of a maximum 539 hm³. At this level the reservoir is critically low.

Over the most recent week on record the fill level has held broadly steady (-0.2 pts), and it is 2.6 points above its level on the same date a year earlier.

Across the readings we hold for Cle Elum Lake — 2187 data points between October 2, 2021 and September 30, 2026 — the level has ranged from a low of 2.9% (October 18, 2024) to a high of 100.1% (June 29, 2022). On average the reservoir is fullest around June and at its lowest around September.

It is operated by BOR primarily for multiple purposes. It lies within the Washington basin at 47.246°N, 121.073°W.