Heron Lake Water Level
Indiana · updated daily from the U.S. Geological Survey
4.77 ft
Heron Lake is current reading available and rising (+0.22 ft in the last 7 days).
Change since yesterday: +0.02 ft
Reading as of 2026-08-15
Where Heron Lake sits historically
Today's level compared with every reading in our 0.3-year record for this lake.
Since yesterday
+0.02 ft
7-day change
+0.22 ft
30-day change
+0.29 ft
1-year change
— ft
Last 30 days
Last 12 months
Heron Lake records and averages
| Current level | 4.77 ft |
|---|---|
| Record high | 4.77 ft (2026-08-15) |
| Record low | 3.17 ft (2026-04-21) |
| Average of all readings | 4.1 ft |
| Data span | 0.3 years (121 readings) |
Frequently asked questions
Is Heron Lake full right now?
As of 2026-08-15, Heron Lake sits at 4.77 ft, which is current reading available.Over the past 30 days the level has risen 0.29 ft.
What is the water level at Heron Lake today?
The most recent reading is 4.77 ft (2026-08-15), sourced from the U.S. Geological Survey. Readings on this page refresh automatically as the agency publishes new data.
What is the highest Heron Lake has ever been?
The highest level in our records is 4.77 ft on 2026-08-15. The lowest is 3.17 ft on 2026-04-21. Our record covers about 0.3 years of readings.
Why is Heron Lake 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. Heron Lake has risen 0.29 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.
How much has Heron Lake changed over the past year?
Year-over-year comparison is not available for this lake yet. The full-history chart above covers 0.3 years, with a record high of 4.77 ft and a record low of 3.17 ft.
Nearby lakes in Indiana
Source: the U.S. Geological Survey. Readings are provisional and subject to revision by the publishing agency. All Indiana lake levels.