Upper Klamath Lake, OR

As of 2026-10-12, Upper Klamath Lake sits at 4140.72 ft, which is about average for this time of year. Over the past 30 days the level has fallen 0.41 ft.

The most recent reading at Upper Klamath Lake is 4140.72 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 Upper Klamath Lake in our records is 4145.28 ft on 2019-05-05. The lowest is 4140.08 ft on 2016-10-13. Our record covers about 10 years of readings.

Compared with every October in our records, the current level is higher than 45% 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. Upper Klamath Lake has fallen 0.41 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.

Upper Klamath Lake is -0.55 ft compared with this date last year (4140.72 ft today). The full-history chart above covers 10 years, with a record high of 4145.28 ft and a record low of 4140.08 ft.