Blue Marsh Lake Water Level

As of 2026-08-14, Blue Marsh Lake sits at 290.04 ft, which is below average for this time of year.Over the past 30 days the level has fallen 0.10 ft.

The most recent reading is 290.04 ft (2026-08-14), sourced from the U.S. Geological Survey. Readings on this page refresh automatically as the agency publishes new data.

The highest level in our records is 308.91 ft on 2011-09-09. The lowest is 281.85 ft on 2010-09-27. Our record covers about 21.9 years of readings.

Compared with every August in our records, the current level is higher than 34% 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. Blue Marsh Lake has fallen 0.10 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.

The level is -0.13 ft compared with this date last year (290.04 ft today). The full-history chart above covers 21.9 years, with a record high of 308.91 ft and a record low of 281.85 ft.