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Lake Wisconsin

Sauk & Columbia counties · river-fed, with current

7,197Acres
24ftMax depth
15Public launches
LowWater clarity

Today on Wisconsin

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Best fishing times

All fish
GoodFairSlow
Best today…

Times by species available in Premium

Wind & weather

National Weather Service
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What Wisconsin is best for

DNR data
WalleyeCommon7.5
LargemouthCommon6.9
SmallmouthCommon6.9
Northern pikeCommon6.9
BluegillPanfish, present4.4
PerchPanfish, present4.4
CrappiePanfish, present4.4
TroutPresent4.4
CatfishPresent4.4
How we rate

Start from how common the DNR says the fish is (abundant 7.5, common 6, present 3.5). Add 1 if the DNR stocked it in the last 5 years, 0.6 for walleye in two-story or complex lakes, and up to 0.9 for lake size. The DNR counts bluegill, perch and crappie together as panfish, so they share a score.

Depth map

Wisconsin DNR
Sheets 3 to 4

The DNR drew Wisconsin on 4 sheets.

Tap a map to zoom. Pinch or scroll to zoom in, drag to move.

✕ Deepest spot, 24 ftDNR survey map (PDF)

Not for navigation. Old survey; depths and weed lines change.

Rules on this lake

DNR · checked 2026-10-07
Walleye15" min · keep none 20–28" · 1 over 28" · 3 a dayOpen All YearOpen
Northern pike26" min · 2 a dayOpen All YearOpen
Bass14" min · 5 a dayOpen All YearOpen
PanfishNo size limit · 25 a dayOpen All YearOpen
SturgeonAll sturgeon taken with hook and line must be tagged and registered. The minimum length is 60" and season limit is 1 fishSeptember 5, 2026 to September 30, 2026Open
CatfishNo size limit · 10 a dayOpen All YearOpen
LicenseWisconsin fishing license. No trout or Great Lakes stamp needed here. How to buy one →
Full rules from the DNR

Launches & access

15 public
WaterEutrophic, low clarity
Lake groupHarmony Grove Lake District Lake Wisconsin Alliance Village Of Merrimac

Stocking

DNR records
2025
462 starhead topminnow yearling, 2"
2024
135 starhead topminnow yearling, 2"
2022
2,486 muskellunge large fingerling, 12"
2021
1,687 starhead topminnow adult, 1.5"
2020
558 starhead topminnow yearling, 1.5"

The DNR has 41 fish surveys on file for this lake.

Before you go

DNR
How often it's safe to eat

This is health advice about eating fish, from the DNR. It is not how many you can catch or keep. Catch limits are in Rules.

Eat any amount Bullheads, Inland Trout

Up to 1 meal a week All Other Species And Sizes, Catfish, Pike, Yellow Perch

Up to 1 meal a month Carp, Crappies, Lake Sturgeon (Less Than 70"), Muskies, Smallmouth Bass, Walleye, White Bass

Up to 6 meals a year Lake Sturgeon (Larger Than 70")

Advice for this water. Stricter for women who may get pregnant and children under 15. DNR details
Invasive species here

Curly-Leaf Pondweed · Eurasian Water-Milfoil · Purple Loosestrife · Zebra Mussel

Drain all water, remove plants and animals, and never move live fish or bait to another lake.

Wisconsin board

Catches & reports

Lakes near Wisconsin

Within 25 miles
LakeMilesAcresMax depth
Crystal LakeColumbia5.75009 ft
Fish LakeDane6.321662 ft
Mud LakeDane6.4545 ft
Devils LakeSauk7.236947 ft
Lake ColumbiaColumbia11.45008 ft
Long LakeColumbia12.36920 ft
Indian LakeDane12.6666 ft
Silver LakeColumbia147442 ft

Wisconsin questions

How deep is Lake Wisconsin?

Lake Wisconsin is 24 feet at its deepest. It covers 7,197 acres.

What fish are in Lake Wisconsin?

The Wisconsin DNR lists largemouth bass (common), smallmouth bass (common), northern pike (common), walleye (common), panfish (present), trout (present) and catfish (present).

Where is the boat launch on Lake Wisconsin?

There are 15 public launches: Access - Corning Street-Town of Dekorra, Access - Summer Oaks Resort off Highway 78, Access -- Whalen Grade, Access - S channel Park Street-Harmony Grove, Access - Palisade Street-Village of Merrimac, Access - Red Cedar Road-Town Of Lodi, Access - Willow Road-Town of Dekorra, Access - Lake Drive off Highway 188, Access - Pine Bluff on Bay Drive, Access - Middle Channel-Harmony Grove, Linda Circle Access, Access - Okee Landing, Access - Pleasantview Road off Highway 188, Access - Moon Valley Landing and Access - Sunset Bay off Highway 188.

Do I need a trout stamp to fish Lake Wisconsin?

A Wisconsin fishing license covers this lake. No trout or Great Lakes stamp needed here.

What is the walleye limit on Lake Wisconsin?

15" min · keep none 20–28" · 1 over 28" · 3 a day. Season: Open All Year.

Is Lake Wisconsin stocked?

Yes. In 2025 the DNR and partners stocked 462 starhead topminnow (yearling).

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Sources: Wisconsin DNR (lake facts, species, rules, stocking, consumption advice, survey map), National Weather Service (forecast). Sun and moon computed for the lake's location. Best times are a model of light and moon, not a promise. Checked 2026-10-07.