WI · ranked by public data

The 25 Biggest Lakes in Waukesha County, Wisconsin

30 Waukesha County lakes cover at least 50 acres, out of 89 documented lakes in the county. Updated July 2026.

12,437 ac
2,437 acres
Waukesha County, WI
Pewaukee Lake
enhancedDepth mapWater data
43.07, -88.322,437 acres | 45 ft max3 public access pointsLargemouth Bass, Musky
2,437 acres · 45 ft max depth · 3 public landings
21,210 ac
1,210 acres
Waukesha County, WI
Okauchee Lake
enhancedDepth mapWater dataDNR forecast
43.12, -88.421,210 acres | 90 ft max2 public access pointsLargemouth Bass, Musky
1,210 acres · 90 ft max depth · 2 public landings
31,154 ac
1,154 acres
Waukesha County, WI
Lac La Belle
enhancedDepth mapDNR impairmentWater data
43.13, -88.521,154 acres | 45 ft max1 public access pointLargemouth Bass, Panfish
1,154 acres · 45 ft max depth · 1 public landing · DNR impairment listed
4981 ac
981 acres
Waukesha County, WI
Nagawicka Lake
enhancedDepth mapWater data
43.08, -88.39981 acres | 90 ft max1 public access pointLargemouth Bass, Northern Pike
981 acres · 90 ft max depth · 1 public landing
5818 ac
818 acres
Waukesha County, WI
Oconomowoc Lake
enhancedDepth mapWater data
43.10, -88.46818 acres | 60 ft max0 public access pointsLargemouth Bass, Northern Pike
818 acres · 60 ft max depth · No verified public access
6711 ac
711 acres
Waukesha County, WI
Pine Lake
enhancedDepth mapWater data
43.12, -88.38711 acres | 85 ft max1 public access pointLargemouth Bass, Smallmouth Bass
711 acres · 85 ft max depth · 1 public landing
7470 ac
470 acres
Waukesha County, WI
Little Muskego Lake
enhancedDepth mapWater data
42.91, -88.14470 acres | 65 ft max4 public access pointsLargemouth Bass, Panfish
470 acres · 65 ft max depth · 4 public landings
8440 ac
440 acres
Waukesha County, WI
North Lake
enhancedDepth mapDNR impairmentWater data
43.15, -88.38440 acres | 78 ft max0 public access pointsLargemouth Bass, Northern Pike
440 acres · 78 ft max depth · No verified public access · DNR impairment listed
9373 ac
373 acres
Waukesha County, WI
Lower Phantom Lake
enhancedDepth mapWater data
42.86, -88.36373 acres | 12 ft max1 public access pointLargemouth Bass, Northern Pike
373 acres · 12 ft max depth · 1 public landing
10313 ac
313 acres
Waukesha County, WI
Beaver Lake
enhancedDepth mapWater dataDNR forecast
43.13, -88.36313 acres | 46 ft max1 public access pointPanfish, Largemouth Bass
313 acres · 46 ft max depth · 1 public landing

Rank	Lake	County	Acres	Max depth	Public access
11	Golden Lake	Waukesha	288 ac	44 ft	2 landings
12	Eagle Spring Lake	Waukesha	279 ac	8 ft	1 landing
13	Upper Nemahbin Lake	Waukesha	277 ac	60 ft	—
14	Lower Nemahbin Lake	Waukesha	239 ac	36 ft	2 landings
15	Lake Keesus	Waukesha	235 ac	42 ft	1 landing
16	Silver Lake	Waukesha	217 ac	40 ft	2 landings
17	Lake Denoon	Waukesha	167 ac	55 ft	1 landing
18	Upper Nashotah Lake	Waukesha	131 ac	53 ft	—
19	School Section Lake	Waukesha	122 ac	8 ft	1 landing
20	Phantom Lakeimpaired	Waukesha	110 ac	29 ft	—
21	Spring Lake	Waukesha	105 ac	22 ft	1 landing
22	Middle Genesee Lake	Waukesha	98 ac	40 ft	1 landing
23	Fowler Lake	Waukesha	97 ac	50 ft	1 landing
24	Ashippun Lake	Waukesha	94 ac	35 ft	1 landing
25	Lower Nashotah Lake	Waukesha	93 ac	43 ft	—

Methodology

How this list is built

Ranked strictly by documented surface acres from DNR lake records.
Flowages and reservoirs count — they are lakes in the DNR's books, and some of the state's biggest water is impounded.
Lakes without documented acreage are excluded rather than estimated.
Lakes under 50 acres — or without documented acreage — are excluded from rankings.
Public access is shown for every lake but never affects the ranking.

FAQ

Waukesha County lake records

What is the biggest lake in Waukesha County?

Pewaukee Lake — Pewaukee Lake in Waukesha County is the biggest lake in Waukesha County, at 2,437 acres.

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

Source data: Wisconsin DNR lake and monitoring records as aggregated by LakeList. Figures reflect the most recent documented values, not new surveys — 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 25 Biggest Lakes in Waukesha County, Wisconsin

30 Waukesha County lakes cover at least 50 acres, out of 89 documented lakes in the county. Updated July 2026.

12,437 ac
2,437 acres
Waukesha County, WI
Pewaukee Lake
enhancedDepth mapWater data
43.07, -88.322,437 acres | 45 ft max3 public access pointsLargemouth Bass, Musky
2,437 acres · 45 ft max depth · 3 public landings
21,210 ac
1,210 acres
Waukesha County, WI
Okauchee Lake
enhancedDepth mapWater dataDNR forecast
43.12, -88.421,210 acres | 90 ft max2 public access pointsLargemouth Bass, Musky
1,210 acres · 90 ft max depth · 2 public landings
31,154 ac
1,154 acres
Waukesha County, WI
Lac La Belle
enhancedDepth mapDNR impairmentWater data
43.13, -88.521,154 acres | 45 ft max1 public access pointLargemouth Bass, Panfish
1,154 acres · 45 ft max depth · 1 public landing · DNR impairment listed
4981 ac
981 acres
Waukesha County, WI
Nagawicka Lake
enhancedDepth mapWater data
43.08, -88.39981 acres | 90 ft max1 public access pointLargemouth Bass, Northern Pike
981 acres · 90 ft max depth · 1 public landing
5818 ac
818 acres
Waukesha County, WI
Oconomowoc Lake
enhancedDepth mapWater data
43.10, -88.46818 acres | 60 ft max0 public access pointsLargemouth Bass, Northern Pike
818 acres · 60 ft max depth · No verified public access
6711 ac
711 acres
Waukesha County, WI
Pine Lake
enhancedDepth mapWater data
43.12, -88.38711 acres | 85 ft max1 public access pointLargemouth Bass, Smallmouth Bass
711 acres · 85 ft max depth · 1 public landing
7470 ac
470 acres
Waukesha County, WI
Little Muskego Lake
enhancedDepth mapWater data
42.91, -88.14470 acres | 65 ft max4 public access pointsLargemouth Bass, Panfish
470 acres · 65 ft max depth · 4 public landings
8440 ac
440 acres
Waukesha County, WI
North Lake
enhancedDepth mapDNR impairmentWater data
43.15, -88.38440 acres | 78 ft max0 public access pointsLargemouth Bass, Northern Pike
440 acres · 78 ft max depth · No verified public access · DNR impairment listed
9373 ac
373 acres
Waukesha County, WI
Lower Phantom Lake
enhancedDepth mapWater data
42.86, -88.36373 acres | 12 ft max1 public access pointLargemouth Bass, Northern Pike
373 acres · 12 ft max depth · 1 public landing
10313 ac
313 acres
Waukesha County, WI
Beaver Lake
enhancedDepth mapWater dataDNR forecast
43.13, -88.36313 acres | 46 ft max1 public access pointPanfish, Largemouth Bass
313 acres · 46 ft max depth · 1 public landing

Rank	Lake	County	Acres	Max depth	Public access
11	Golden Lake	Waukesha	288 ac	44 ft	2 landings
12	Eagle Spring Lake	Waukesha	279 ac	8 ft	1 landing
13	Upper Nemahbin Lake	Waukesha	277 ac	60 ft	—
14	Lower Nemahbin Lake	Waukesha	239 ac	36 ft	2 landings
15	Lake Keesus	Waukesha	235 ac	42 ft	1 landing
16	Silver Lake	Waukesha	217 ac	40 ft	2 landings
17	Lake Denoon	Waukesha	167 ac	55 ft	1 landing
18	Upper Nashotah Lake	Waukesha	131 ac	53 ft	—
19	School Section Lake	Waukesha	122 ac	8 ft	1 landing
20	Phantom Lakeimpaired	Waukesha	110 ac	29 ft	—
21	Spring Lake	Waukesha	105 ac	22 ft	1 landing
22	Middle Genesee Lake	Waukesha	98 ac	40 ft	1 landing
23	Fowler Lake	Waukesha	97 ac	50 ft	1 landing
24	Ashippun Lake	Waukesha	94 ac	35 ft	1 landing
25	Lower Nashotah Lake	Waukesha	93 ac	43 ft	—

Methodology

How this list is built

Ranked strictly by documented surface acres from DNR lake records.
Flowages and reservoirs count — they are lakes in the DNR's books, and some of the state's biggest water is impounded.
Lakes without documented acreage are excluded rather than estimated.
Lakes under 50 acres — or without documented acreage — are excluded from rankings.
Public access is shown for every lake but never affects the ranking.

FAQ

Waukesha County lake records

What is the biggest lake in Waukesha County?

Pewaukee Lake — Pewaukee Lake in Waukesha County is the biggest lake in Waukesha County, at 2,437 acres.

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

The 25 Biggest Lakes in Waukesha County, Wisconsin

Pewaukee Lake

Okauchee Lake

Lac La Belle

Nagawicka Lake

Oconomowoc Lake

Pine Lake

Little Muskego Lake

North Lake

Lower Phantom Lake

Beaver Lake

How this list is built

Waukesha County lake records

What is the biggest lake in Waukesha County?

The 25 Biggest Lakes in Waukesha County, Wisconsin

Pewaukee Lake

Okauchee Lake

Lac La Belle

Nagawicka Lake

Oconomowoc Lake

Pine Lake

Little Muskego Lake

North Lake

Lower Phantom Lake

Beaver Lake

How this list is built

Waukesha County lake records

What is the biggest lake in Waukesha County?