WI · ranked by public data

The 25 Deepest Lakes in Waukesha County, Wisconsin

30 Waukesha County lakes are at least 50 acres with a documented maximum depth, out of 89 documented lakes in the county. Updated July 2026.

190 ft
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
90 ft maximum depth · 1,210 acres · 2 public landings
290 ft
981 acres
Waukesha County, WI
Nagawicka Lake
enhancedDepth mapWater data
43.08, -88.39981 acres | 90 ft max1 public access pointLargemouth Bass, Northern Pike
90 ft maximum depth · 981 acres · 1 public landing
385 ft
711 acres
Waukesha County, WI
Pine Lake
enhancedDepth mapWater data
43.12, -88.38711 acres | 85 ft max1 public access pointLargemouth Bass, Smallmouth Bass
85 ft maximum depth · 711 acres · 1 public landing
478 ft
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
78 ft maximum depth · 440 acres · No verified public access · DNR impairment listed
565 ft
470 acres
Waukesha County, WI
Little Muskego Lake
enhancedDepth mapWater data
42.91, -88.14470 acres | 65 ft max4 public access pointsLargemouth Bass, Panfish
65 ft maximum depth · 470 acres · 4 public landings
661 ft
83 acres
Waukesha County, WI
Moose Lake
enhancedDepth mapWater data
43.13, -88.4083 acres | 61 ft max3 public access pointsLargemouth Bass, Panfish
61 ft maximum depth · 83 acres · 3 public landings
760 ft
818 acres
Waukesha County, WI
Oconomowoc Lake
enhancedDepth mapWater data
43.10, -88.46818 acres | 60 ft max0 public access pointsLargemouth Bass, Northern Pike
60 ft maximum depth · 818 acres · No verified public access
860 ft
277 acres
Waukesha County, WI
Upper Nemahbin Lake
enhancedDepth mapWater data
43.07, -88.43277 acres | 60 ft max0 public access pointsLargemouth Bass, Northern Pike
60 ft maximum depth · 277 acres · No verified public access
955 ft
167 acres
Waukesha County, WI
Lake Denoon
enhancedDepth mapWater data
42.85, -88.17167 acres | 55 ft max1 public access pointLargemouth Bass, Northern Pike
55 ft maximum depth · 167 acres · 1 public landing
1053 ft
131 acres
Waukesha County, WI
Upper Nashotah Lake
enhancedDepth mapWater data
43.09, -88.43131 acres | 53 ft max0 public access pointsLargemouth Bass, Panfish
53 ft maximum depth · 131 acres · No verified public access

Rank	Lake	County	Max depth	Acres	Public access
11	Fowler Lake	Waukesha	50 ft	97	1 landing
12	Beaver Lake	Waukesha	46 ft	313	1 landing
13	Pewaukee Lake	Waukesha	45 ft	2,437	3 landings
14	Lac La Belleimpaired	Waukesha	45 ft	1,154	1 landing
15	Lower Genesee Lake	Waukesha	45 ft	63	1 landing
16	Golden Lake	Waukesha	44 ft	288	2 landings
17	Lower Nashotah Lake	Waukesha	43 ft	93	—
18	Lake Keesus	Waukesha	42 ft	235	1 landing
19	Silver Lake	Waukesha	40 ft	217	2 landings
20	Middle Genesee Lake	Waukesha	40 ft	98	1 landing
21	Lower Nemahbin Lake	Waukesha	36 ft	239	2 landings
22	Hunters Lake	Waukesha	36 ft	54	1 landing
23	Ashippun Lake	Waukesha	35 ft	94	1 landing
24	Pretty Lake	Waukesha	31 ft	65	1 landing
25	Phantom Lakeimpaired	Waukesha	29 ft	110	—

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

Waukesha County lake records

What is the deepest lake in Waukesha County?

Okauchee Lake — Okauchee Lake in Waukesha County is the deepest documented lake in Waukesha County, at 90 feet maximum depth.

Deepest lakes statewide Biggest 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 Deepest Lakes in Waukesha County, Wisconsin

30 Waukesha County lakes are at least 50 acres with a documented maximum depth, out of 89 documented lakes in the county. Updated July 2026.

190 ft
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
90 ft maximum depth · 1,210 acres · 2 public landings
290 ft
981 acres
Waukesha County, WI
Nagawicka Lake
enhancedDepth mapWater data
43.08, -88.39981 acres | 90 ft max1 public access pointLargemouth Bass, Northern Pike
90 ft maximum depth · 981 acres · 1 public landing
385 ft
711 acres
Waukesha County, WI
Pine Lake
enhancedDepth mapWater data
43.12, -88.38711 acres | 85 ft max1 public access pointLargemouth Bass, Smallmouth Bass
85 ft maximum depth · 711 acres · 1 public landing
478 ft
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
78 ft maximum depth · 440 acres · No verified public access · DNR impairment listed
565 ft
470 acres
Waukesha County, WI
Little Muskego Lake
enhancedDepth mapWater data
42.91, -88.14470 acres | 65 ft max4 public access pointsLargemouth Bass, Panfish
65 ft maximum depth · 470 acres · 4 public landings
661 ft
83 acres
Waukesha County, WI
Moose Lake
enhancedDepth mapWater data
43.13, -88.4083 acres | 61 ft max3 public access pointsLargemouth Bass, Panfish
61 ft maximum depth · 83 acres · 3 public landings
760 ft
818 acres
Waukesha County, WI
Oconomowoc Lake
enhancedDepth mapWater data
43.10, -88.46818 acres | 60 ft max0 public access pointsLargemouth Bass, Northern Pike
60 ft maximum depth · 818 acres · No verified public access
860 ft
277 acres
Waukesha County, WI
Upper Nemahbin Lake
enhancedDepth mapWater data
43.07, -88.43277 acres | 60 ft max0 public access pointsLargemouth Bass, Northern Pike
60 ft maximum depth · 277 acres · No verified public access
955 ft
167 acres
Waukesha County, WI
Lake Denoon
enhancedDepth mapWater data
42.85, -88.17167 acres | 55 ft max1 public access pointLargemouth Bass, Northern Pike
55 ft maximum depth · 167 acres · 1 public landing
1053 ft
131 acres
Waukesha County, WI
Upper Nashotah Lake
enhancedDepth mapWater data
43.09, -88.43131 acres | 53 ft max0 public access pointsLargemouth Bass, Panfish
53 ft maximum depth · 131 acres · No verified public access

Rank	Lake	County	Max depth	Acres	Public access
11	Fowler Lake	Waukesha	50 ft	97	1 landing
12	Beaver Lake	Waukesha	46 ft	313	1 landing
13	Pewaukee Lake	Waukesha	45 ft	2,437	3 landings
14	Lac La Belleimpaired	Waukesha	45 ft	1,154	1 landing
15	Lower Genesee Lake	Waukesha	45 ft	63	1 landing
16	Golden Lake	Waukesha	44 ft	288	2 landings
17	Lower Nashotah Lake	Waukesha	43 ft	93	—
18	Lake Keesus	Waukesha	42 ft	235	1 landing
19	Silver Lake	Waukesha	40 ft	217	2 landings
20	Middle Genesee Lake	Waukesha	40 ft	98	1 landing
21	Lower Nemahbin Lake	Waukesha	36 ft	239	2 landings
22	Hunters Lake	Waukesha	36 ft	54	1 landing
23	Ashippun Lake	Waukesha	35 ft	94	1 landing
24	Pretty Lake	Waukesha	31 ft	65	1 landing
25	Phantom Lakeimpaired	Waukesha	29 ft	110	—

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

Waukesha County lake records

What is the deepest lake in Waukesha County?

Okauchee Lake — Okauchee Lake in Waukesha County is the deepest documented lake in Waukesha County, at 90 feet maximum depth.

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

The 25 Deepest Lakes in Waukesha County, Wisconsin

Okauchee Lake

Nagawicka Lake

Pine Lake

North Lake

Little Muskego Lake

Moose Lake

Oconomowoc Lake

Upper Nemahbin Lake

Lake Denoon

Upper Nashotah Lake

How this list is built

Waukesha County lake records

What is the deepest lake in Waukesha County?

The 25 Deepest Lakes in Waukesha County, Wisconsin

Okauchee Lake

Nagawicka Lake

Pine Lake

North Lake

Little Muskego Lake

Moose Lake

Oconomowoc Lake

Upper Nemahbin Lake

Lake Denoon

Upper Nashotah Lake

How this list is built

Waukesha County lake records

What is the deepest lake in Waukesha County?