Isabella Lake, CA

As of 2026-10-13, Isabella Lake sits at 2555.74 ft, which is about average for this time of year. Over the past 30 days the level has fallen 3.36 ft.

The most recent reading at Isabella Lake is 2555.74 ft (2026-10-13), sourced from the U.S. Army Corps of Engineers. Readings on this page refresh automatically as the agency publishes new data.

The highest level for Isabella Lake in our records is 2605.01 ft on 1998-07-25. The lowest is 2522.36 ft on 2015-10-03. Our record covers about 35 years of readings.

Compared with every October in our records, the current level is higher than 53% 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. Isabella Lake has fallen 3.36 ft over the past 30 days. For the operational reason on any given week, check the U.S. Army Corps of Engineers directly.

Isabella Lake is -11.12 ft compared with this date last year (2555.74 ft today). The full-history chart above covers 35 years, with a record high of 2605.01 ft and a record low of 2522.36 ft.