Island Lake (Cass County)
Cass County, Minnesota - DNR stocking history, depth and survey data
Minnesota · Minnesota Department of Natural Resources (DNR) · DOW 11010200
DNR records show 5 stocking entries at Island Lake (Cass County) since 2017, most recently walleye fry in 2025 (29,670 fish).
- Island Lake (Cass County) has 5 DNR stocking records across 5 years (2017-2025): walleye (5).
- The most-stocked species by count is walleye: 149,465 fish on record.
- Maximum depth 45 ft; surface area 358 acres, 59 littoral acres, 5.8 miles of shoreline, per the DNR lake survey.
- Average water clarity (Secchi depth) 9.8 ft.
- Fish species DNR lists here: black crappie, bluegill, bowfin (dogfish), brown bullhead, green sunfish, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, rock bass, walleye, yellow bullhead.
- 1 public access on the DNR list.
- Most recent DNR fish survey: (standard survey).
- Cass County, nearest town Longville; DNR lake number (DOW) 11010200.
Depth map
Bathymetric contours from the Minnesota DNR lake survey; depths in feet. Simplified for the web; not for navigation.
Stocking history
| Year | Species | Size | Number | Pounds |
|---|---|---|---|---|
| 2025 | Walleye | fry | 29,670 | 0.2 |
| 2023 | Walleye | fry | 29,700 | 0.2 |
| 2021 | Walleye | fry | 30,475 | 0.2 |
| 2019 | Walleye | fry | 29,920 | 0.2 |
| 2017 | Walleye | fry | 29,700 | 0.2 |
Field note · Minnesota stocks by year, not by truck day: walleye fry go in within weeks of ice-out, fingerlings and yearlings mostly in fall, and stream trout in spring and fall. A row here means the fish went in during that year; DNR adds the year's rows after the fact, so the current year can look empty until winter.
Public accesses
| Type | Owner | Where |
|---|---|---|
| O | county | Access at southwest corner of lake. - ACCESS AT SOUTHWEST CORNER OF LAKE. |
DNR fish survey, 2022
| Species | Gear | Catch per net | Total catch | Avg lb |
|---|---|---|---|---|
| Bluegill | Standard trap nets | 8.22 | 74 | 0.19 |
| Yellow bullhead | Standard trap nets | 2.22 | 20 | 0.87 |
| Pumpkinseed | Standard trap nets | 2.00 | 18 | 0.23 |
| Black crappie | Standard trap nets | 2.00 | 18 | 0.28 |
| Bowfin (dogfish) | Standard trap nets | 1.44 | 13 | 5.40 |
| Hybrid sunfish | Standard trap nets | 0.44 | 4 | 0.41 |
| Northern pike | Standard trap nets | 0.33 | 3 | 2.69 |
| Largemouth bass | Standard trap nets | 0.22 | 2 | 1.29 |
| Bluegill | Standard gill nets | 7.00 | 42 | 0.21 |
| Yellow bullhead | Standard gill nets | 3.33 | 20 | 0.44 |
| Northern pike | Standard gill nets | 3.33 | 20 | 1.41 |
| Black crappie | Standard gill nets | 2.67 | 16 | 0.54 |
| Rock bass | Standard gill nets | 1.50 | 9 | 0.63 |
| Pumpkinseed | Standard gill nets | 1.17 | 7 | 0.21 |
| Walleye | Standard gill nets | 1.00 | 6 | 2.89 |
| Largemouth bass | Standard gill nets | 0.83 | 5 | 1.19 |
Catch per net (CPUE) is the DNR survey's count per gill net or trap net set; higher means more of that species were sampled, not a fishing forecast. Top species per gear shown; where we have no verified common name for a DNR code, the code itself is shown.
Island Lake is a 358-acre lake with 5.8 miles of shoreline and a maximum depth of 45 feet located southeast of Longville, MN. A county owned public access is located on the west shore. The DNR has classified Minnesota's lakes into 43 different classes based on physical, chemical and other characteristics. Island Lake is in Lake Class 23; lakes in this class are generally deep and clear. Other area lakes in this class include Jack, Ponto, Stony, and Baby Lake. The lake is primarily managed for Northern Pike and Largemouth Bass and secondarily for Black Crappie, Bluegill, and Walleye. Island Lake provides multi-species angling opportunity and a game fish community dominated by sunfish and Northern Pike. Though Northern Pike abundance was below the management goal, size goals were met in 2022 highlighting quality size structure. Sampled pike ranged in length from 10 to 34 inches. Black Crappie abundance and size exceeded management goals and ranged in length from 4 to 13 inches. Largemouth Bass averaged 12 inches long and abundance was low. Sampled Bluegill exceeded size goals with fish measuring up to 9.5 inches and most exceeding 6 inches in length. Walleye abundance in Island is low and lengths ranged from 13 to 24 inches long. Other fish species that anglers can expect to encounter include Bowfin, Brown Bullhead, Green Sunfish, Hybrid Sunfish, Pumpkinseed, Rock Bass, and Yellow Bullhead. People can have significant impacts on lakes and the fish populations they support. Harvest, lakeshore development, removal of shoreline vegetation, and introductions of invasive species can all adversely affect fish populations. Currently, no aquatic invasive species (AIS) have been identified in Island Lake. AIS are moved from infested to non-infested waters by anglers, boaters, and lake shore owners and can adversely impact lakes and fish populations. To avoid spreading AIS, lake users are required to remove all aquatic plants or animals from their watercraft and drain all water from their boat before leaving the access. If you suspect an infestation of an invasive species in this lake, save a specimen and report it to a local natural resource office. Additional information on all of these topics can be found on the DNR website (www.dnr.state.mn.us) or by contacting the Walker Area Fisheries office.
Minnesota DNR survey narrative, .
All Minnesota stockings · every Minnesota lake with a page · state CSV · this lake on DNR LakeFinder
Stocking rows, depths, accesses and survey figures are Minnesota DNR LakeFinder data as of 2026-09-02; contours are the DNR bathymetric survey. Regulations, slot limits and special rules are on the DNR page linked above, not here.
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