Edward Arthur Patterson Lake Water Level

As of 2026-08-14, Edward Arthur Patterson Lake sits at 2417.86 ft, which is below average for this time of year.Over the past 30 days the level has fallen 0.33 ft.

The most recent reading is 2417.86 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 2420.83 ft on 2023-04-10. The lowest is 2415.26 ft on 2021-10-08. Our record covers about 5.5 years of readings.

Compared with every August in our records, the current level is higher than 26% of them — below 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. Edward Arthur Patterson Lake has fallen 0.33 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 -1.68 ft compared with this date last year (2417.86 ft today). The full-history chart above covers 5.5 years, with a record high of 2420.83 ft and a record low of 2415.26 ft.