Mariposa Reservoir, CA

As of 2026-10-13, Mariposa Reservoir sits at 365.47 ft, which is about average for this time of year. Over the past 30 days the level has fallen 1.53 ft.

The most recent reading at Mariposa Reservoir is 365.47 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 Mariposa Reservoir in our records is 440.92 ft on 2017-02-11. The lowest is 361.64 ft on 2015-10-28. Our record covers about 35 years of readings.

Compared with every October in our records, the current level is higher than 54% 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. Mariposa Reservoir has fallen 1.53 ft over the past 30 days. For the operational reason on any given week, check the U.S. Army Corps of Engineers directly.

Mariposa Reservoir is +0.09 ft compared with this date last year (365.47 ft today). The full-history chart above covers 35 years, with a record high of 440.92 ft and a record low of 361.64 ft.