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Lake Koshkonong Water Level Today

Daily level, changes and history for Lake Koshkonong, on the Rock River in Wisconsin.

Updated · Source: USGS 05427235 Provisional

Water level Provisional

776.23ft

msl · 6:00 PM CST, Nov 8, 2026

  • +0.01 ftin 24 h+0.03 ft in 7 days−0.74 ft in 30 days
774776778780774776778780
  • 1 yr ago

Is Lake Koshkonong full?

Lake Koshkonong is a natural lake on the Rock River. Indianford Dam, downstream, holds it a little higher under a Wisconsin DNR water level order, but there is no single full level to compare with, so this page compares the level with past years and with the National Weather Service flood stage (780 ft). It is 0.29 ft higher than a year ago (775.94 ft on Nov 8, 2025).

Lake Koshkonong level history

View data table
DateLevel (ft)% full
Nov 8, 2026776.23—
Nov 7, 2026776.22—
Nov 6, 2026776.25—
Nov 5, 2026776.26—
Nov 4, 2026776.23—
Nov 3, 2026776.18—
Nov 2, 2026776.17—
Nov 1, 2026776.20—
Oct 31, 2026776.20—
Oct 30, 2026776.20—
Oct 29, 2026776.20—
Oct 28, 2026776.16—
Oct 27, 2026776.21—
Oct 26, 2026776.29—
Oct 25, 2026776.35—
Oct 24, 2026776.40—
Oct 23, 2026776.44—
Oct 22, 2026776.44—
Oct 21, 2026776.42—
Oct 20, 2026776.40—
Oct 19, 2026776.39—
Oct 18, 2026776.45—
Oct 17, 2026776.53—
Oct 16, 2026776.67—
Oct 15, 2026776.67—
Oct 14, 2026776.73—
Oct 13, 2026776.78—
Oct 12, 2026776.78—
Oct 11, 2026776.86—
Oct 10, 2026776.92—
Oct 9, 2026776.97—
  • Lake Koshkonong level
Source: USGS · Daily averages since 1987

Lake Koshkonong on Nov 8 in past years

Lake Koshkonong water level on Nov 8 in past years
YearLevel (ft)vs today
2026today776.23—
2025775.94−0.29
2024776.08−0.15
2023776.07−0.16
2022776.93+0.70
2021776.00−0.23
2020777.64+1.41
2019779.52+3.29
2018779.34+3.11
2017775.98−0.25
2016778.65+2.42

Today’s level is the highest for this date since 2022.

Lake facts

Highest since 1987
785.09 ftJun 21, 2008
Lowest since 1987
775.02 ftDec 6, 2012
Data since
Jul 1, 1987
Dam
Indianford Dam
River
Rock River
Gauge location
42.8575, −88.9409

Records cover Jul 1, 1987 to today (daily averages).

Weather on the lake

  1. Tonight36°FLowNW 0–5 mphMostly Clear
  2. Monday58°FHighLow 40°FW 0–10 mphMostly Sunny
  3. Tuesday59°FHighLow 37°FNW 5 mphSunny
  4. Wednesday52°FHighLow 34°FNE 0–10 mphChance Light Rain
  5. Thursday41°FHighLow 27°FN 15 mphPartly Sunny
  6. Friday41°FHighLow 26°FN 5–15 mphSunny
  7. Saturday43°FHighLow 32°FNW 5 mphSunny

Forecast: National Weather Service for the dam area (42.86, −88.94). Wind speeds are forecasts, not measurements.

Quick answers

Is Lake Koshkonong rising or falling?
It is steady: +0.03 ft in the last 7 days and +0.01 ft in 24 hours, to 776.23 ft on 6:00 PM CST, Nov 8, 2026 (US Geological Survey).
What is the highest level in our data?
Lake Koshkonong reached 785.09 ft on Jun 21, 2008. The lowest was 775.02 ft on Dec 6, 2012 (USGS data since 1987; older records are not in this data set).
How much has Lake Koshkonong changed in the last year?
In the last 12 months it ranged from 775.86 ft (Nov 11, 2025) to 781.38 ft (Apr 24, 2026), a swing of 5.52 ft.
How often is this page updated?
This page is updated several times a day with the latest reading from US Geological Survey. The last reading is from 6:00 PM CST, Nov 8, 2026.

Where this data comes from

Reservoir gauge 05427235 of the US Geological Survey (waterdata.usgs.gov). Recent readings are provisional and may be revised. Weather from the National Weather Service.

Lake Levels Daily is an independent site, not affiliated with TWDB, LCRA, USACE, USGS, NOAA, TVA or any lake operator. Check official sources before making safety decisions.