Fishing Castle Rock Lake, Wisconsin: What You Can Catch, When, and Where to Launch

by Castle Rock Realty Team

With Paul Merk and Bobbi Brandt, Castle Rock Realty

Quick take: Castle Rock Lake is best known for walleye, but it holds nearly every Wisconsin freshwater species except trout. Fish move with the seasons and the water temperature, so where you fish matters as much as what you throw. And there are public launches on both the Juneau County and Adams County sides.

"What is it like to fish on Castle Rock Lake?" is one of the questions our agents hear most. So Bobbi Brandt went out with Paul Merk, a Broker Associate with Castle Rock Realty and a lifelong angler who fishes Castle Rock Lake every chance he gets, to find out. Watch the full trip below, or read on for the highlights.

What you can catch

Castle Rock Lake is part of the Wisconsin River, and like the river it is known first as a walleye fishery. Beyond walleye, you will find:

Smallmouth and largemouth bass
Musky and northern pike
Catfish and sturgeon
Crappies, bluegills and perch

"Pretty much every freshwater fish," as Paul puts it. "There's no trout."

Before you go, check the Wisconsin DNR fishing regulations for current seasons, size limits and license requirements.

How the fish move through the year

Fish on Castle Rock Lake travel with the seasons, and water temperature drives most of it.

Spring: Walleye spawn, and it is a prime time to fish for them.
Late spring and summer: Musky fishing picks up from about May on. After the spawn, walleye spread out onto flats, and many anglers troll for them.
Late summer: When lake temperatures climb into the high 70s, musky look for cooler water. They gather near inlets, where tributaries bring in cooler, fresher water.
Fall: Often the best fishing of the year. Fish of every species follow the baitfish and feed heavily before winter. Panfish such as bluegill and crappie tend to hold in deeper water near channels, drop-offs and other structure.
Winter: Ice anglers fish for walleye and pike and jig for crappies, bluegills and perch. In a good ice year, small shanty villages form on the Juneau County side, straight out from between the Shipwreck and the Dirty Turtle.

Why the tributaries matter

Castle Rock Lake is fed by the Wisconsin River, the Yellow River, the Little Yellow River and several smaller creeks. Each inlet changes the water temperature around it. That gives the lake plenty of structure, and it gives fish somewhere to go when the main lake warms up. Paul's favorite late-summer musky spots are near inlets, like where the Little Yellow comes in by Half Moon Bay, and where water comes in by the Crazy Taco on the Adams County side along County Road Z.

Public boat launches on Castle Rock Lake

There are launches all around the lake, on both the Juneau County and Adams County sides:

Buckhorn State Park: several launches, including one on County Road G. A Wisconsin state park pass covers them.
Castle Rock County Park: Juneau County and Adams County each run a Castle Rock County Park with a launch, one on each side of the lake.
Highway 21: an Adams County park launch on the river.
Near May's Point: a launch on 29th Street on the Juneau County side.
County Road G on the river: another launch on the Juneau County side.
Odell's Bay Marina and Pine Cove: private launches that are open to the public for a fee.

About passes: Buckhorn's launches are part of the state park system and use a Wisconsin state park pass. County park launches use a county park pass, and each county's pass is good only at that county's parks, so Juneau County and Adams County each need their own. Private launches charge a launch fee or sell a season pass.

Know the water before you run it

Sand bottom and stumps. Castle Rock Lake has a sandy bottom, with stump fields in some areas. Watch your depth.
Sandbars upriver. Follow the channel buoys when heading up the river.
Water levels. Dams on the Wisconsin River manage the lake level. Water can run high in spring, and when it drops, sandbars that were covered can catch you off guard.

A lake with room to breathe

Much of Castle Rock Lake's shoreline is natural, including the large peninsula protected as Buckhorn State Park. For a lake this size, that natural shoreline is one of the things people notice most.

Frequently asked questions

What is Castle Rock Lake known for?
Walleye. The lake is part of the Wisconsin River, which is known for its walleye fishery. It also holds bass, musky, pike, catfish, sturgeon and panfish.

What is the best time to fish Castle Rock Lake?
Spring is prime for walleye during the spawn, and fall is often the best overall, since fish of every species feed heavily before winter.

Where can I launch a boat on Castle Rock Lake?
Public options include Buckhorn State Park, the Juneau County and Adams County Castle Rock County Parks, an Adams County launch on Highway 21, and launches on the Juneau County side near May's Point and on County Road G. Odell's Bay Marina and Pine Cove offer private launches open to the public for a fee.

Do I need a pass to launch?
Yes, in most places. Buckhorn State Park uses a Wisconsin state park pass. County park passes are good only at that county's parks, so Juneau County and Adams County launches each need their own. Private launches charge a fee or sell a season pass.

Can you ice fish on Castle Rock Lake?
Yes. Walleye, pike, crappies, bluegills and perch are common targets through the ice.

Live where you fish

Our agents live, work and fish around Castle Rock Lake. If you are thinking about a home on the water or a place close to it, we would love to help. Call our office at 608.847.6020.

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