MN · ranked by public data

The 25 Deepest Lakes in Cass County, Minnesota

101 Cass County lakes are at least 50 NHD-mapped acres with a DNR-documented depth, out of 612 documented lakes in the county.

1135 ft
103,350 acres
Cass County, MN
Leech Lake
limitedDepth map
47.16, -94.41103,350 acres | 135 ft max0 public access pointsSpecies pending
135 ft maximum depth · 103,350 acres
2129 ft
1,506 acres
Cass County, MN
Roosevelt Lake
limitedDepth map
46.81, -93.961,506 acres | 129 ft max0 public access pointsSpecies pending
129 ft maximum depth · 1,506 acres
3120 ft
20,696 acres
Cass County, MN
Cass Lake
limitedDepth map
47.41, -94.5520,696 acres | 120 ft max0 public access pointsSpecies pending
120 ft maximum depth · 20,696 acres
4115 ft
935 acres
Cass County, MN
Long Lake
limitedDepth map
47.02, -94.18935 acres | 115 ft max0 public access pointsSpecies pending
115 ft maximum depth · 935 acres
5111 ft
1,586 acres
Cass County, MN
Washburn Lake
limitedDepth map
46.87, -93.991,586 acres | 111 ft max0 public access pointsSpecies pending
111 ft maximum depth · 1,586 acres
6110 ft
141 acres
Cass County, MN
Jack Lake
limitedDepth map
47.06, -94.45141 acres | 110 ft max0 public access pointsSpecies pending
110 ft maximum depth · 141 acres
7107 ft
530 acres
Cass County, MN
Big Deep Lake
limitedDepth map
46.91, -94.38530 acres | 107 ft max0 public access pointsSpecies pending
107 ft maximum depth · 530 acres
8105 ft
129 acres
Cass County, MN
Deep Portage Lake
limitedDepth map
46.87, -94.39129 acres | 105 ft max0 public access pointsSpecies pending
105 ft maximum depth · 129 acres
995 ft
1,251 acres
Cass County, MN
Thunder Lake
limitedDepth map
46.96, -93.981,251 acres | 95 ft max0 public access pointsSpecies pending
95 ft maximum depth · 1,251 acres
1095 ft
272 acres
Cass County, MN
Moccasin Lake
limitedDepth map
46.99, -94.36272 acres | 95 ft max0 public access pointsSpecies pending
95 ft maximum depth · 272 acres

Rank	Lake	County	Max depth	Acres
11	Steamboat Lake	Cass	93 ft	1,761
12	Man Lake	Cass	93 ft	488
13	Wabedo Lake	Cass	90 ft	1,199
14	Webb Lake	Cass	84 ft	713
15	Portage Lake	Cass	84 ft	279
16	Girl Lake	Cass	81 ft	412
17	Gull Lake	Cass	80 ft	9,903
18	Pine Mountain Lake	Cass	80 ft	1,572
19	Long Lake	Cass	80 ft	274
20	Little Boy Lake	Cass	74 ft	1,423
21	Crooked Lake	Cass	74 ft	551
22	Pleasant Lake	Cass	72 ft	1,076
23	Lawrence Lake	Cass	71 ft	218
24	Lake Winnibigoshish	Cass	70 ft	55,762
25	Inguadona Lake	Cass	70 ft	1,118

Methodology

How this list is built

Ranked by the official maximum depth in Minnesota DNR LakeFinder records; where none is published, the deepest mapped contour from MN DNR survey bathymetry stands in (contours can slightly understate depth, never overstate it).
Only lakes with published Minnesota DNR survey bathymetry on LakeList can rank (about 1,500 lakes). Deep border waters without a published DNR depth record — Saganaga Lake among them — are not listed rather than guessed at.
Lakes under 50 acres — or without a confidently matched USGS NHD polygon for acreage — are excluded from rankings.
Public access inventories are not yet tracked for Minnesota here, so access is never shown or ranked.

FAQ

Cass County lake records

What is the deepest lake in Cass County?

Leech Lake — Leech Lake in Cass County has the deepest documented maximum depth of any ranked Cass County lake, at 135 feet in Minnesota DNR records.

Deepest lakes statewide Biggest lakes in Cass County All Cass County lakes

Source data: Minnesota DNR LakeFinder records and MN DNR survey bathymetry, with acreage from USGS National Hydrography Dataset polygons, as aggregated by LakeList.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.

MN · ranked by public data

The 25 Deepest Lakes in Cass County, Minnesota

101 Cass County lakes are at least 50 NHD-mapped acres with a DNR-documented depth, out of 612 documented lakes in the county.

1135 ft
103,350 acres
Cass County, MN
Leech Lake
limitedDepth map
47.16, -94.41103,350 acres | 135 ft max0 public access pointsSpecies pending
135 ft maximum depth · 103,350 acres
2129 ft
1,506 acres
Cass County, MN
Roosevelt Lake
limitedDepth map
46.81, -93.961,506 acres | 129 ft max0 public access pointsSpecies pending
129 ft maximum depth · 1,506 acres
3120 ft
20,696 acres
Cass County, MN
Cass Lake
limitedDepth map
47.41, -94.5520,696 acres | 120 ft max0 public access pointsSpecies pending
120 ft maximum depth · 20,696 acres
4115 ft
935 acres
Cass County, MN
Long Lake
limitedDepth map
47.02, -94.18935 acres | 115 ft max0 public access pointsSpecies pending
115 ft maximum depth · 935 acres
5111 ft
1,586 acres
Cass County, MN
Washburn Lake
limitedDepth map
46.87, -93.991,586 acres | 111 ft max0 public access pointsSpecies pending
111 ft maximum depth · 1,586 acres
6110 ft
141 acres
Cass County, MN
Jack Lake
limitedDepth map
47.06, -94.45141 acres | 110 ft max0 public access pointsSpecies pending
110 ft maximum depth · 141 acres
7107 ft
530 acres
Cass County, MN
Big Deep Lake
limitedDepth map
46.91, -94.38530 acres | 107 ft max0 public access pointsSpecies pending
107 ft maximum depth · 530 acres
8105 ft
129 acres
Cass County, MN
Deep Portage Lake
limitedDepth map
46.87, -94.39129 acres | 105 ft max0 public access pointsSpecies pending
105 ft maximum depth · 129 acres
995 ft
1,251 acres
Cass County, MN
Thunder Lake
limitedDepth map
46.96, -93.981,251 acres | 95 ft max0 public access pointsSpecies pending
95 ft maximum depth · 1,251 acres
1095 ft
272 acres
Cass County, MN
Moccasin Lake
limitedDepth map
46.99, -94.36272 acres | 95 ft max0 public access pointsSpecies pending
95 ft maximum depth · 272 acres

Rank	Lake	County	Max depth	Acres
11	Steamboat Lake	Cass	93 ft	1,761
12	Man Lake	Cass	93 ft	488
13	Wabedo Lake	Cass	90 ft	1,199
14	Webb Lake	Cass	84 ft	713
15	Portage Lake	Cass	84 ft	279
16	Girl Lake	Cass	81 ft	412
17	Gull Lake	Cass	80 ft	9,903
18	Pine Mountain Lake	Cass	80 ft	1,572
19	Long Lake	Cass	80 ft	274
20	Little Boy Lake	Cass	74 ft	1,423
21	Crooked Lake	Cass	74 ft	551
22	Pleasant Lake	Cass	72 ft	1,076
23	Lawrence Lake	Cass	71 ft	218
24	Lake Winnibigoshish	Cass	70 ft	55,762
25	Inguadona Lake	Cass	70 ft	1,118

Methodology

How this list is built

Ranked by the official maximum depth in Minnesota DNR LakeFinder records; where none is published, the deepest mapped contour from MN DNR survey bathymetry stands in (contours can slightly understate depth, never overstate it).
Only lakes with published Minnesota DNR survey bathymetry on LakeList can rank (about 1,500 lakes). Deep border waters without a published DNR depth record — Saganaga Lake among them — are not listed rather than guessed at.
Lakes under 50 acres — or without a confidently matched USGS NHD polygon for acreage — are excluded from rankings.
Public access inventories are not yet tracked for Minnesota here, so access is never shown or ranked.

FAQ

Cass County lake records

What is the deepest lake in Cass County?

Leech Lake — Leech Lake in Cass County has the deepest documented maximum depth of any ranked Cass County lake, at 135 feet in Minnesota DNR records.

Deepest lakes statewide Biggest lakes in Cass County All Cass County lakes

The 25 Deepest Lakes in Cass County, Minnesota

Leech Lake

Roosevelt Lake

Cass Lake

Long Lake

Washburn Lake

Jack Lake

Big Deep Lake

Deep Portage Lake

Thunder Lake

Moccasin Lake

How this list is built

Cass County lake records

What is the deepest lake in Cass County?

The 25 Deepest Lakes in Cass County, Minnesota

Leech Lake

Roosevelt Lake

Cass Lake

Long Lake

Washburn Lake

Jack Lake

Big Deep Lake

Deep Portage Lake

Thunder Lake

Moccasin Lake

How this list is built

Cass County lake records

What is the deepest lake in Cass County?