Tule Lake Wetland Unit 1B Water Level

As of 2026-08-14, Tule Lake Wetland Unit 1B sits at 4034.53 ft, which is high for this time of year.Over the past 30 days the level has risen 0.35 ft.

The most recent reading is 4034.53 ft (2026-08-14), sourced from the U.S. Bureau of Reclamation. Readings on this page refresh automatically as the agency publishes new data.

The highest level in our records is 998877.0 ft on 2022-02-09. The lowest is 4030.46 ft on 2022-08-09. Our record covers about 5.0 years of readings.

Compared with every August in our records, the current level is higher than 99% of them — high 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. Tule Lake Wetland Unit 1B has risen 0.35 ft over the past 30 days. For the operational reason on any given week, check the U.S. Bureau of Reclamation directly.

The level is +0.29 ft compared with this date last year (4034.53 ft today). The full-history chart above covers 5.0 years, with a record high of 998877.0 ft and a record low of 4030.46 ft.