Lake Mendota Water Level
Wisconsin · updated daily from the U.S. Geological Survey
9.95 ft
Lake Mendota is low for this time of year and steady (+0.08 ft in the last 7 days).
Change since yesterday: -0.01 ft
Reading as of 2026-08-14 · higher than 17% of August readings on record
Where Lake Mendota sits historically
Today's level compared with every reading in our 5.0-year record for this lake.
Since yesterday
-0.01 ft
7-day change
+0.08 ft
30-day change
+0.14 ft
1-year change
-0.32 ft
Last 30 days
Last 12 months
Full history (5.0 years)
Lake Mendota records and averages
| Current level | 9.95 ft |
|---|---|
| Record high | 11.93 ft (2024-07-05) |
| Record low | 7.95 ft (2026-02-09) |
| Average of all readings | 9.6 ft |
| Data span | 5.0 years (1,778 readings) |
Frequently asked questions
Is Lake Mendota full right now?
As of 2026-08-14, Lake Mendota sits at 9.95 ft, which is low for this time of year.Over the past 30 days the level has risen 0.14 ft.
What is the water level at Lake Mendota today?
The most recent reading is 9.95 ft (2026-08-14), sourced from the U.S. Geological Survey. Readings on this page refresh automatically as the agency publishes new data.
What is the highest Lake Mendota has ever been?
The highest level in our records is 11.93 ft on 2024-07-05. The lowest is 7.95 ft on 2026-02-09. Our record covers about 5.0 years of readings.
Is Lake Mendota low for this time of year?
Compared with every August in our records, the current level is higher than 17% of them — low 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.
Why is Lake Mendota changing right now?
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. Lake Mendota has risen 0.14 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.
How much has Lake Mendota changed over the past year?
The level is -0.32 ft compared with this date last year (9.95 ft today). The full-history chart above covers 5.0 years, with a record high of 11.93 ft and a record low of 7.95 ft.
Nearby lakes in Wisconsin
Source: the U.S. Geological Survey. Readings are provisional and subject to revision by the publishing agency. All Wisconsin lake levels.