Lake Koshkonong
Rock County, Wisconsin · WBIC 808700
This lake has fishing rules that differ from the standard ones for its area. Check the official rules before you fish. Official regulations
Size
10,460 acres
Max depth
7 ft
DNR lake type
Complex, Riverine
Water clarity
19 ft
Clear, measured Jul 2021
A river-like water type, with flow instead of a still basin. This describes the lake type in general, not this lake in particular.
Outline
Numbered dots are boat landings; tap one for directions. The list below has the same numbers. Drawn from the DNR's 24K hydrography (surveyed 1971), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
19 ft Secchi depthClearOlder reading
Last measured Jul 6, 2021. 1 reading on record, 2021.
Only one reading is on record.
Nothing has been measured in the last 5 years, so this may not match the lake today.
Secchi depth is how far down a white disk stays visible. A bigger number means clearer water. Clear means a Secchi depth of 10 feet or more, moderate 5 to 10 feet, low under 5 feet.
Wisconsin DNR water monitoring (volunteer and staff), via the Water Quality Portal; station Lake Koshkonong - Lakeview Campground Beach (1901 E. State Rd. 59 Milton). Checked Oct 23, 2026.
Water temperature
A typical year Modeled estimate
- Ice goes outabout Apr 1 (Mar 25 to Apr 10)
- Surface reaches 48°Fabout Apr 10 (Apr 1 to Apr 18)
- Surface reaches 64°Fabout May 10 (May 2 to May 18)
- June surface75°F, usually 73 to 76°F
- July surface80°F, usually 78 to 81°F
- August surface76°F, usually 73 to 79°F
Mixes regularly through the summer instead of forming a warm top layer.
A computer model of this lake's typical weather and water, built from 15 years, 2005 to 2019. Ranges show the middle half of years. The model was calibrated against measured temperatures for this lake. It is an estimate, not a measurement.
Modeled: U.S. Geological Survey lake temperature data release (doi:10.5066/P9CA6XP8).
Today at the lake
Forecast: National Weather Service (no endorsement implied). Sunrise, sunset and moon phase are calculated. The moon phase can be a day off.
Stocking history
- Northern Pikelast stocked 2023 (large fingerling and small fingerling); stocked in 8 years since 2010
- Walleyelast stocked 2023 (small fingerling); stocked in 11 years since 2010
- Yellow Perchlast stocked 2023 (large fingerling and yearling); stocked in 3 years since 2010
- Muskellungelast stocked 2017 (large fingerling and small fingerling); stocked in 7 years since 2010
Stocking shows what was added to the lake, not what is in it now.
Wisconsin DNR annual fish stocking summary. Checked Oct 23, 2026.
Fish recorded near this lake
- Black Bullhead Ameiurus melas1964; 1 record
- Bluegill Lepomis macrochirus1975; 1 record
- Common Carp Cyprinus carpio1964; 1 record
- Largemouth Bass Micropterus salmoides1863; 1 record
- Northern Pike Esox lucius1975; 1 record
- Pumpkinseed Lepomis gibbosus1863 to 1975; 3 records
- Walleye Sander vitreus1975; 1 record
- White Bass Morone chrysops1964; 1 record
- White Crappie Pomoxis annularis1964; 1 record
- Yellow Perch Perca flavescens1863 to 1975; 2 records
Recorded in open fish survey and museum records (GBIF). A record shows a fish was found near this lake in that year, not that it is there now, and says nothing about how many. Most coordinates are rounded to about 1 km, so a record is attached only when one lake is the clear match.
Open fish survey and museum records from GBIF; datasets are listed on the sources page. Checked Oct 23, 2026.
Boat landings
- 1Royce-Dallman County Park Boat RampBoat ramp · Concrete surface · County
Directions - 2Bingham Road Boat Ramp (listed under Jefferson County)Boat ramp · Paved surface · Township
Directions - 3Vinne HaHa Landing (listed under Jefferson County)Boat ramp · Concrete surface · State(dnr)
Directions - 4Lake Koshkonong Access (listed under Jefferson County)Boat ramp · Paved surface · Township
Directions
Wisconsin DNR public boat access sites. Checked Oct 23, 2026.
Water level and flow
- LAKE KOSHKONONG NEAR NEWVILLE, WIGage height, Lake or reservoir elevation (NAVD 1988)
U.S. Geological Survey gauges at or beside this lake. Readings are provisional and fetched when you open the page.
More lakes in Rock County
- Clear Lake5.0 miles away
- Bowers Lake6.4 miles away
- Storrs Lake7.0 miles away
- Willies Pond8.5 miles away
- Spauldings Pond9.7 miles away
- Gibbs Lake13 miles away
Where this comes from
- Size, depth and lake typeWisconsin DNR lake classifications, checked Oct 23, 2026
- OutlineWisconsin DNR 24K hydrography, checked Oct 23, 2026
- Stocking historyWisconsin DNR annual fish stocking summary, checked Oct 23, 2026
- Regulations linkWisconsin DNR fishing regulations (linked, not restated), checked Oct 23, 2026
- Boat landingsWisconsin DNR public boat access sites, checked Oct 23, 2026
- Water clarityWisconsin DNR water monitoring, via the Water Quality Portal, checked Oct 23, 2026
- Typical-year temperatureU.S. Geological Survey lake temperature model (modeled estimate), checked Oct 23, 2026
- Fish recordedOpen fish survey and museum records, via GBIF, checked Oct 23, 2026
- Water level and flowU.S. Geological Survey gauges (readings are live), checked Oct 23, 2026
- VHS statusWisconsin DNR VHS status by watershed, checked Oct 24, 2026
- Depth map linkWisconsin DNR lake maps list, checked Oct 24, 2026
See data sources for what each source covers, and about for how the numbers are matched to lakes.
Something wrong on this page? Report a problem.