WI · ranked by public data

The 10 Deepest Lakes in Marathon County, Wisconsin

10 Marathon County lakes are at least 50 acres with a documented maximum depth, out of 69 documented lakes in the county. Updated July 2026.

146 ft
6,348 acres
Marathon County, WI
Big Eau Pleine Reservoir
enhancedDepth mapWater data
44.75, -89.876,348 acres | 46 ft max12 public access pointsWalleye, Northern Pike
46 ft maximum depth · 6,348 acres · 12 public landings
234 ft
204 acres
Marathon County, WI
Pike Lake
enhancedDepth mapWater data
44.81, -89.35204 acres | 34 ft max1 public access pointPanfish, Largemouth Bass
34 ft maximum depth · 204 acres · 1 public landing
330 ft
1,851 acres
Marathon County, WI
Lake Wausau
enhancedDepth mapWater dataDNR forecast
44.92, -89.631,851 acres | 30 ft max4 public access pointsPanfish, Northern Pike
30 ft maximum depth · 1,851 acres · 4 public landings
426 ft
104 acres
Marathon County, WI
Mission Lake
enhancedDepth mapWater data
44.78, -89.35104 acres | 26 ft max1 public access pointPanfish, Largemouth Bass
26 ft maximum depth · 104 acres · 1 public landing
522 ft
56 acres
Marathon County, WI
Stenson Lake
availableDepth map
44.71, -89.2756 acres | 22 ft max0 public access pointsSpecies pending
22 ft maximum depth · 56 acres · No verified public access
619 ft
96 acres
Marathon County, WI
Norrie Lake
enhancedDepth mapStockedWater data
44.88, -89.2696 acres | 19 ft max1 public access pointPanfish, Largemouth Bass
19 ft maximum depth · 96 acres · 1 public landing
717 ft
69 acres
Marathon County, WI
Mud Lake
enhancedDepth mapStocked
44.92, -89.2969 acres | 17 ft max1 public access pointLargemouth Bass, Panfish
17 ft maximum depth · 69 acres · 1 public landing
816 ft
99 acres
Marathon County, WI
Mayflower Lake
enhancedDepth mapStockedWater data
44.91, -89.2699 acres | 16 ft max1 public access pointLargemouth Bass, Northern Pike
16 ft maximum depth · 99 acres · 1 public landing
913 ft
177 acres
Marathon County, WI
Big Bass Lake
enhancedDepth mapWater data
44.72, -89.43177 acres | 13 ft max1 public access pointPanfish, Largemouth Bass
13 ft maximum depth · 177 acres · 1 public landing
1010 ft
184 acres
Marathon County, WI
Eau Claire Flowage
enhancedDepth mapWater data
44.92, -89.61184 acres | 10 ft max1 public access pointNorthern Pike, Panfish
10 ft maximum depth · 184 acres · 1 public landing

Methodology

How this list is built

Ranked strictly by documented maximum depth from DNR lake records. No estimates, no hearsay depths.
Lakes without a documented maximum depth are excluded rather than guessed at.
Lakes under 50 acres — or without documented acreage — are excluded from rankings.
Public access is shown for every lake but never affects the ranking — a deep lake ranks whether or not you can launch on it.

FAQ

Marathon County lake records

What is the deepest lake in Marathon County?

Big Eau Pleine Reservoir — Big Eau Pleine Reservoir in Marathon County is the deepest documented lake in Marathon County, at 46 feet maximum depth.

Deepest lakes statewide Biggest lakes in Marathon County Clearest lakes in Marathon County Lakes with the most public access in Marathon County All Marathon County lakes

Source data: Wisconsin DNR lake and monitoring records as aggregated by LakeList. Figures reflect the most recent documented values, not new surveys, and conditions change — verify access and rules before you go.Lake outlines are shoreline shapes from LakeList and the USGS National Hydrography Dataset; they illustrate a lake's form and are not depth or navigation charts.

WI · ranked by public data

The 10 Deepest Lakes in Marathon County, Wisconsin

10 Marathon County lakes are at least 50 acres with a documented maximum depth, out of 69 documented lakes in the county. Updated July 2026.

146 ft
6,348 acres
Marathon County, WI
Big Eau Pleine Reservoir
enhancedDepth mapWater data
44.75, -89.876,348 acres | 46 ft max12 public access pointsWalleye, Northern Pike
46 ft maximum depth · 6,348 acres · 12 public landings
234 ft
204 acres
Marathon County, WI
Pike Lake
enhancedDepth mapWater data
44.81, -89.35204 acres | 34 ft max1 public access pointPanfish, Largemouth Bass
34 ft maximum depth · 204 acres · 1 public landing
330 ft
1,851 acres
Marathon County, WI
Lake Wausau
enhancedDepth mapWater dataDNR forecast
44.92, -89.631,851 acres | 30 ft max4 public access pointsPanfish, Northern Pike
30 ft maximum depth · 1,851 acres · 4 public landings
426 ft
104 acres
Marathon County, WI
Mission Lake
enhancedDepth mapWater data
44.78, -89.35104 acres | 26 ft max1 public access pointPanfish, Largemouth Bass
26 ft maximum depth · 104 acres · 1 public landing
522 ft
56 acres
Marathon County, WI
Stenson Lake
availableDepth map
44.71, -89.2756 acres | 22 ft max0 public access pointsSpecies pending
22 ft maximum depth · 56 acres · No verified public access
619 ft
96 acres
Marathon County, WI
Norrie Lake
enhancedDepth mapStockedWater data
44.88, -89.2696 acres | 19 ft max1 public access pointPanfish, Largemouth Bass
19 ft maximum depth · 96 acres · 1 public landing
717 ft
69 acres
Marathon County, WI
Mud Lake
enhancedDepth mapStocked
44.92, -89.2969 acres | 17 ft max1 public access pointLargemouth Bass, Panfish
17 ft maximum depth · 69 acres · 1 public landing
816 ft
99 acres
Marathon County, WI
Mayflower Lake
enhancedDepth mapStockedWater data
44.91, -89.2699 acres | 16 ft max1 public access pointLargemouth Bass, Northern Pike
16 ft maximum depth · 99 acres · 1 public landing
913 ft
177 acres
Marathon County, WI
Big Bass Lake
enhancedDepth mapWater data
44.72, -89.43177 acres | 13 ft max1 public access pointPanfish, Largemouth Bass
13 ft maximum depth · 177 acres · 1 public landing
1010 ft
184 acres
Marathon County, WI
Eau Claire Flowage
enhancedDepth mapWater data
44.92, -89.61184 acres | 10 ft max1 public access pointNorthern Pike, Panfish
10 ft maximum depth · 184 acres · 1 public landing

Methodology

How this list is built

Ranked strictly by documented maximum depth from DNR lake records. No estimates, no hearsay depths.
Lakes without a documented maximum depth are excluded rather than guessed at.
Lakes under 50 acres — or without documented acreage — are excluded from rankings.
Public access is shown for every lake but never affects the ranking — a deep lake ranks whether or not you can launch on it.

FAQ

Marathon County lake records

What is the deepest lake in Marathon County?

Big Eau Pleine Reservoir — Big Eau Pleine Reservoir in Marathon County is the deepest documented lake in Marathon County, at 46 feet maximum depth.

Deepest lakes statewide Biggest lakes in Marathon County Clearest lakes in Marathon County Lakes with the most public access in Marathon County All Marathon County lakes

The 10 Deepest Lakes in Marathon County, Wisconsin

Big Eau Pleine Reservoir

Pike Lake

Lake Wausau

Mission Lake

Stenson Lake

Norrie Lake

Mud Lake

Mayflower Lake

Big Bass Lake

Eau Claire Flowage

How this list is built

Marathon County lake records

What is the deepest lake in Marathon County?

The 10 Deepest Lakes in Marathon County, Wisconsin

Big Eau Pleine Reservoir

Pike Lake

Lake Wausau

Mission Lake

Stenson Lake

Norrie Lake

Mud Lake

Mayflower Lake

Big Bass Lake

Eau Claire Flowage

How this list is built

Marathon County lake records

What is the deepest lake in Marathon County?