First Fork Sinnemahoning Creek Reservoir, PA

As of 2026-10-12, First Fork Sinnemahoning Creek Reservoir sits at 922.27 ft, which is high for this time of year. Over the past 30 days the level has risen 0.37 ft.

The most recent reading at First Fork Sinnemahoning Creek Reservoir is 922.27 ft (2026-10-12), sourced from the U.S. Geological Survey. Readings on this page refresh automatically as the agency publishes new data.

The highest level for First Fork Sinnemahoning Creek Reservoir in our records is 957.65 ft on 2018-09-12. The lowest is 909.33 ft on 2017-05-08. Our record covers about 10 years of readings.

Compared with every October in our records, the current level is higher than 83% of them, which we classify as 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. First Fork Sinnemahoning Creek Reservoir has risen 0.37 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.

First Fork Sinnemahoning Creek Reservoir is +0.04 ft compared with this date last year (922.27 ft today). The full-history chart above covers 10 years, with a record high of 957.65 ft and a record low of 909.33 ft.