Rimrock Lake, WA

As of 2026-09-30, Rimrock Lake sits at 2870.18 ft, which is about average for this time of year. Over the past 30 days the level has fallen 33.87 ft.

The most recent reading at Rimrock Lake is 2870.18 ft (2026-09-30), sourced from the U.S. Bureau of Reclamation. Readings on this page refresh automatically as the agency publishes new data.

The highest level for Rimrock Lake in our records is 2926.04 ft on 2022-06-30. The lowest is 2803.05 ft on 2024-10-13. Our record covers about 4 years of readings.

Compared with every September in our records, the current level is higher than 45% of them, which we classify as about average for this time of year. Seasonal comparison matters more than the raw number, because most reservoirs draw down predictably through late summer and refill over winter and spring.

Reservoir levels move for four main reasons: rainfall and runoff into the basin, releases through the dam for downstream water supply, power generation or flood control, evaporation during hot months, and seasonal drawdown schedules set by the operating agency. Rimrock Lake has fallen 33.87 ft over the past 30 days. For the operational reason on any given week, check the U.S. Bureau of Reclamation directly.

Rimrock Lake is +44.59 ft compared with this date last year (2870.18 ft today). The full-history chart above covers 4 years, with a record high of 2926.04 ft and a record low of 2803.05 ft.