Lake Koshkonong near Newville water level

Name: Lake Koshkonong near Newville water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

Lake, Lake Koshkonong, Wisconsin, United States

Directions

High for mid-October

Surface elevation

776.26ft Steady over the last 24 hours

Measured Oct 20, 2026, 09:00 PM CDT (26 min ago)

Water level: 6.41 ft

History

What this means

There is plenty of water in Lake Koshkonong near Newville: 776.26 ft, above normal for mid-October.

That puts it 0.18 ft above the median of 776.08 ft for mid-October, based on 7 years of readings. A year ago it stood at 776.30 ft (−0.04 ft).

The level has held steady over the past 24 hours. Over the past 30 days it has moved between 776.17 ft and 776.82 ft.

Lakes and reservoirs often sit lower in fall after a summer of evaporation and use, and recover with winter rain and spring snowmelt.

Compared with 7 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date: 776.08 ft0.18 ft above the median for this date
Normal for this date: 775.80 ft – 776.36 ft8 years in 10 fall in this range (7 years of records)
Same day last year: 776.30 ft−0.04 ft
Lowest and highest in 30 days: 776.17 ft – 776.82 ft
Lowest and highest in 12 months: 775.63 ft – 781.15 ft

Swimming and boating at Lake Koshkonong near Newville

A little more water than usual mostly means narrower beaches. Ramps and docks generally work as normal, but watch for floating debris after storms.

If you swim, pick a spot with an easy way out, and remember that drop-offs move as the level changes.

What happens at each level

776.26 ft: Right now
14.00 ft: There is widespread flooding of lakeside homes and roads in the Lake Koshkonong area including Vets Lane, Blackhawk Island Road and Oxbow Bend Road.
13.00 ft: There is widespread flooding of lakeside homes and roads in the Lake Koshkonong area including Vets Lane, Blackhawk Island Road and Oxbow Bend Road.
12.00 ft: There is widespread flooding of lakeside homes and roads in the Lake Koshkonong area including Vets Lane, Blackhawk Island Road and Oxbow Bend Road.
11.30 ft: There is knee-deep water over Blackhawk Island Road. Lamp Road on west side of river also becomes flooded. Lake Koshkonong merges with Mud Lake to the east of Lake Koshkonong.
11.00 ft: In the Town of Lake Koshkonong, floodwaters affect Vets Lane, Blackhawk Island Road, and Oxbow Bend Road. There is widespread flooding of roads and docks in the Town of Koshkonong and Town of Sumner including Vets Lane, Blackhawk Island Road and Oxbow Bend Road.
10.50 ft: Floodwaters reach Oxbow Bend Road in the area of the gage on the east side of the lake. Flooded roads: The end of Road 9, end of E Road 8 St, end of E Road 7, Lakeview Dr, Charley Bluff Rd north of Royce Dallman Park, parts of Lamp Rd, Willow Rd, parts of Blackhawk Island Rd. Water surrounds some structures on Lamp Rd and towards end of Blackhawk Island Rd. Low lying areas of Lakeland Campground flood. Altpeter County Park floods. Water into yards along High Ridge Rd.
10.00 ft: Floodwaters affect homes and boat docks in the Blackhawk Island area of Lake Koshkonong on the north side of the lake. Floodwaters spread over low spots on Blackhawk Island Road in the area where the Rock River enters the lake.
9.50 ft: Water is into low lying areas along Lake Koshkonong. Water approaches homes along Blackhawk Island.
9.00 ft: Water spreads into low lying areas along Lake Koshkonong. Water into yards along Blackhawk Island.

Impact statements from the U.S. National Weather Service.

Weather at the gauge

No rain in the last 3 days.

20 Tue 67° 38° – Wind 8 mph

21 Wed 70° 45° – Wind 8 mph

22 Thu 70° 45° – Wind 7 mph

23 Fri 69° 51° – Wind 10 mph

24 Sat 69° 52° – Wind 15 mph

25 Sun 68° 53° – Wind 10 mph

26 Mon 53° 36° 0.32 in Wind 16 mph

Forecast: Open-Meteo

Sunrise 07:17 AM Sunset 06:05 PM Daylight 10 hr, 48 min Waxing gibbous 73%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Rock River at NewvilleRiver gauge, Rock River	2.71 ft	Below flood stage	+0.01 ft	4.5 mi
Rock River at Fort AtkinsonRiver gauge, Rock River	11.52 ft	Below flood stage	+0.01 ft	7 mi
Rock River at JeffersonRiver gauge, Rock River	4.80 ft	Below flood stage	+0.02 ft	12 mi
Yahara River near FultonRiver gauge, Yahara River	4.47 ft	Below flood stage	−0.03 ft	12 mi
Badfish Creek near CooksvilleRiver gauge, Badfish Creek	91.2 cfs	Normal	−1.5 cfs	13 mi
Yahara River @ Forton Street Bridge @ StoughtonRiver gauge	261 cfs	Normal	−2.0 cfs	15 mi
Bark River near RomeRiver gauge, Bark River	2.03 ft	Below flood stage	−0.03 ft	15 mi
Crawfish River at MilfordRiver gauge, Crawfish River	3.06 ft	Below flood stage	−0.02 ft	17 mi

Questions and answers

How does Lake Koshkonong near Newville compare with last year?

It is 0.04 ft lower than on the same day last year, when the reading was 776.30 ft.

What is a normal level for Lake Koshkonong near Newville in mid-October?

The median for mid-October is 776.08 ft. In 8 years out of 10 the reading falls between 775.80 ft and 776.36 ft, based on 7 years of records.

Is Lake Koshkonong near Newville really 776.26 ft deep?

No. 776.26 ft is the height of the water surface above sea level (or the agency's vertical datum), not the depth of the water.

What is the water level of Lake Koshkonong near Newville today?

On Oct 20, 2026, 09:00 PM CDT, the surface elevation was 776.26 ft. Steady over the last 24 hours.

Is Lake Koshkonong near Newville rising or falling?

Steady over the last 24 hours. Down 0.25 ft over the last 7 days.

Is the level of Lake Koshkonong near Newville normal?

High for mid-October. Compared with 7 years of daily readings for this time of year.

How often is this data updated?

The U.S. Geological Survey publishes a new reading every 15 minutes. This page refreshes within minutes of each update.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:05427235 (Agency page)
Coordinates: 42.85751, -88.94090 (WGS84)
Vertical datum: NAVD88
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Surface elevation	776.26 ft	2026-10-21 02:00	Provisional
Water level	6.41 ft	2026-10-21 02:00	Provisional

Download

Embed this gauge

Add a live card for this gauge to your website. It updates on its own and links back here.

<iframe src="https://nivelmap.com/embed/5137?lang=en" width="360" height="230" style="border:0;max-width:100%" loading="lazy" title="Lake Koshkonong near Newville water level"></iframe>

How to cite

U.S. Geological Survey: Lake Koshkonong near Newville (usgs:05427235). Accessed October 21, 2026 via Nivelmap, https://nivelmap.com/en/united-states/wisconsin/lake-koshkonong-near-newville

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer