Rock Lake (Jefferson County)

Jefferson, Wisconsin

Rock Lake is a 1,365-acre lake near Lake Mills in Jefferson County with a maximum depth of 60 feet and moderately clear water. WDNR lists panfish, largemouth bass, smallmouth bass and walleye as common, with northern pike present.

Air temp in Lake Mills, WI Loading current temperature…

Map data © OpenStreetMap contributors.

Current air temperature at Rock Lake (Jefferson County) (National Weather Service) ↗

Surface area1,365 acres

Max depth60 ft

Shoreline—

Boat motorsCheck local ordinances

Species

Fishery rating out of 5.

Bluegill●●●○○

Panfish common per WDNR

Crappie●●●○○

Panfish common per WDNR

Largemouth Bass●●●○○

Common per WDNR

Smallmouth Bass●●●○○

Common per WDNR

Walleye●●●○○

Common per WDNR

Northern Pike●●○○○

Present per WDNR

Boat launches

2 launch sites. Fees and hours change, so confirm before you go.

Rock Lake public boat landingsPublic
WDNR lists 4 public boat landing(s)Directions ↗
More public accessPublic
See the WDNR lake page for all landingsDirections ↗

Size & creel limits

Special rules for this lake, confirmed from official state regulations. Minimum size and daily limit.

Species	Min size	Daily limit
Walleye Open May 2, 2026 to Mar 7, 2027	15 in	3 / day
Largemouth/Smallmouth Bass Open May 2, 2026 to Mar 7, 2027	14 in	5 / day
Northern Pike Open May 2, 2026 to Mar 7, 2027	26 in	2 / day
Muskellunge May 2 to Dec 31, 2026; open water only	40 in	1 / day
Panfish Open all year	See Wisconsin rules book ↗	25 / day
Catfish Open all year	See Wisconsin rules book ↗	10 / day
Trout See specific trout regulations	Varies	Varies

Other species in this lake: look up the limits at Wisconsin DNR ↗

Verified October 2026. Rules change, so confirm current limits with the Wisconsin DNR before you fish.

Bait & tackle nearby

Closest shops to the lake and its boat launches. Call ahead for live bait and hours.

The Happy Hooker Bait & TackleNearby
345 Sandy Beach Rd, Lake Mills, WI 53551(920) 648-8800 Directions ↗
Party Mart Bait & LiquorNearby
7124 Highway V, Lake Mills, WI 53551Directions ↗
JMP Bait & TackleNearby
N4094 Marina Ln, Cambridge, WI 53523(608) 423-3608 Directions ↗

Search more bait shops near Rock Lake (Jefferson County) ↗

Local tips

Deep, fairly clear lake: fish drop-offs and deeper structure
Smallmouth relate to rocky points
Check WDNR regulations before keeping fish

View on interactive map

Zoom and pan on a street, satellite or terrain map. Red pins are boat launches; blue pins are bait shops nearby.

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Always wear a life jacket and check your state's current regulations before you fish.