Rock

Cass County, Minnesota — DOW #11032400

24 Surveys
261.01
Acres
17 ft
Max Depth
0
11
Fish Species
25
Local Guides

DNR Fish Surveys

Catch-per-unit-effort (CPUE) data from Minnesota DNR fish population assessments on Rock. Green = above normal range. Red = below normal.

Black Bullhead

Date Gear CPUE Normal Range Avg Weight Total Catch
1985-07-22 Standard trap nets 24.0 (above normal) 1.1 – 17.4 0.08 lb 72
1985-07-22 Standard gill nets 85.0 (above normal) 1.9 – 57.5 0.09 lb 170
1980-07-16 Standard gill nets 74.7 (above normal) 1.9 – 57.5 0.13 lb 224
1980-07-16 Standard trap nets 25.0 (above normal) 1.1 – 17.4 0.15 lb 100

Brown Bullhead

Date Gear CPUE Normal Range Avg Weight Total Catch
1985-07-22 Standard trap nets 105.7 (above normal) 1.5 – 9.8 0.22 lb 317
1985-07-22 Standard gill nets 12.5 (above normal) 1.5 – 9.9 0.12 lb 25

Tadpole Madtom

Date Gear CPUE Normal Range Avg Weight Total Catch
1985-07-22 Standard trap nets 0.7 0.05 lb 2

Northern Pike

Date Gear CPUE Normal Range Avg Weight Total Catch
1985-07-22 Standard gill nets 4.5 (below normal) 4.6 – 11.6 1.44 lb 9
1985-07-22 Standard trap nets 0.3 0.20 lb 1
1980-07-16 Standard gill nets 15.3 (above normal) 4.6 – 11.6 0.47 lb 46
1980-07-16 Standard trap nets 2.0 0.97 lb 8

Hybrid Sunfish

Date Gear CPUE Normal Range Avg Weight Total Catch
1985-07-22 Standard gill nets 0.5 0.10 lb 1
1985-07-22 Standard trap nets 1.7 0.30 lb 5

Rock Bass

Date Gear CPUE Normal Range Avg Weight Total Catch
1985-07-22 Standard trap nets 0.3 (normal) 0.3 – 1.4 0.30 lb 1

Walleye

Date Gear CPUE Normal Range Avg Weight Total Catch
1985-07-22 Standard gill nets 11.0 (above normal) 1.5 – 5.8 2.43 lb 22
1985-07-22 Standard trap nets 0.3 (normal) 0.3 – 0.8 2.00 lb 1

Bluegill

Date Gear CPUE Normal Range Avg Weight Total Catch
1985-07-22 Standard gill nets 1.0 0.20 lb 2
1985-07-22 Standard trap nets 15.0 (normal) 2.5 – 25.0 0.14 lb 45
1980-07-16 Standard trap nets 0.3 (below normal) 2.5 – 25.0 0.20 lb 1

Pumpkinseed

Date Gear CPUE Normal Range Avg Weight Total Catch
1985-07-22 Standard gill nets 11.5 0.11 lb 23
1985-07-22 Standard trap nets 109.3 (above normal) 1.4 – 8.6 0.06 lb 328
1980-07-16 Standard trap nets 0.5 (below normal) 1.4 – 8.6 0.20 lb 2

Black Crappie

Date Gear CPUE Normal Range Avg Weight Total Catch
1985-07-22 Standard gill nets 1.5 (normal) 1.0 – 7.3 0.13 lb 3
1985-07-22 Standard trap nets 4.0 (normal) 0.8 – 6.5 0.12 lb 12

Depth Maps & Lake Info

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Map & Directions

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Fish Species

Species known to inhabit Rock. Click any species for a full fishing guide.

Black CrappieBluegillBowfin (Dogfish)Brown BullheadHybrid SunfishLargemouth BassNorthern PikePumpkinseedWhite SuckerYellow BullheadYellow Perch

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Data sourced from Minnesota DNR Division of Fish and Wildlife. Last verified: March 19, 2026. Learn how we maintain this data.