Diamond Lake (Cass County)
Cass County, Minnesota - DNR stocking history, depth and survey data
Minnesota · Minnesota Department of Natural Resources (DNR) · DOW 11039600
DNR records show 14 stocking entries at Diamond Lake (Cass County) since 2016, most recently rainbow trout yearlings in 2025 (100 fish).
- Diamond Lake (Cass County) has 14 DNR stocking records across 10 years (2016-2025): rainbow trout (14).
- The most-stocked species by count is rainbow trout: 120,564 fish on record.
- Maximum depth 31 ft; surface area 77 acres, 62 littoral acres, 1.9 miles of shoreline, per the DNR lake survey.
- Average water clarity (Secchi depth) 12.7 ft.
- Fish species DNR lists here: black bullhead, rainbow trout.
- 1 public access on the DNR list.
- Most recent DNR fish survey: (standard survey).
- Cass County, nearest town Walker; DNR lake number (DOW) 11039600.
Depth map
Bathymetric contours from the Minnesota DNR lake survey mapped 6/26/1979 (orig map); depths in feet. Simplified for the web; not for navigation.
Stocking history
| Year | Species | Size | Number | Pounds |
|---|---|---|---|---|
| 2025 | Rainbow Trout | yearlings | 100 | 76.3 |
| 2025 | Rainbow Trout | adults | 102 | 398.5 |
| 2024 | Rainbow Trout | yearlings | 1,500 | 500.0 |
| 2024 | Rainbow Trout | fingerlings | 7,000 | 769.2 |
| 2023 | Rainbow Trout | fingerlings | 14,000 | 1,284.4 |
| 2022 | Rainbow Trout | fingerlings | 14,020 | 1,286.2 |
| 2021 | Rainbow Trout | fingerlings | 2,035 | 372.0 |
| 2021 | Rainbow Trout | fingerlings | 14,000 | 1,427.1 |
| 2020 | Rainbow Trout | fingerlings | 10,305 | 2,250.0 |
| 2019 | Rainbow Trout | fingerlings | 14,000 | 1,555.6 |
| 2018 | Rainbow Trout | fingerlings | 14,000 | 1,372.5 |
| 2018 | Rainbow Trout | fingerlings | 1,502 | 264.4 |
| 2017 | Rainbow Trout | fingerlings | 14,000 | 1,085.3 |
| 2016 | Rainbow Trout | fingerlings | 14,000 | 1,052.6 |
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 |
|---|---|---|
| concrete ramp | USF | WEST SHORE |
DNR fish survey, 2021
| Species | Gear | Catch per net | Total catch | Avg lb |
|---|---|---|---|---|
| Black bullhead | Standard gill nets | 277.50 | 555 | 0.01 |
| Rainbow trout | Standard gill nets | 76.00 | 152 | 0.43 |
| Fathead minnow | 1/4-in trap nets | 100.50 | 201 | 0.00 |
| FND | 1/4-in trap nets | 50.00 | 100 | 0.00 |
| Northern redbelly dace | 1/4-in trap nets | 48.50 | 97 | 0.00 |
| Black bullhead | 1/4-in trap nets | 21.00 | 42 | 0.07 |
| Rainbow trout | 1/4-in trap nets | 16.50 | 33 | 0.33 |
| Black bullhead | 3/8-in trap nets | 21.50 | 43 | 0.04 |
| Rainbow trout | 3/8-in trap nets | 10.50 | 21 | 0.31 |
| Fathead minnow | 3/8-in trap nets | 1.50 | 3 | 0.00 |
| FND | 3/8-in trap nets | 1.00 | 2 | 0.00 |
| Northern redbelly dace | 3/8-in trap nets | 0.50 | 1 | 0.00 |
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.
Diamond Lake is a 77-acre lake with 1.86 miles of shoreline and a maximum depth of 31 feet located northeast of Hackensack, MN. There is a US Forest Service public access located on the west shore. Diamond Lake offers Rainbow Trout fishing in a remote, wilderness like setting. The lake is entirely within the Chippewa National Forest and the shoreline is undeveloped. Diamond Lake is one of four designated stream trout lakes in the Walker Fisheries Management Area. Other stream trout lakes in the Walker Management Area are Hazel, Perch, and Teepee Lakes. Rainbow Trout were initially stocked in Diamond Lake in 1967. Rainbow Trout do not reproduce in the lake and the population is supported entirely by stocking to provide a unique angling opportunity. Rainbow Trout stocking success is dependent on the absence of introduced species. The average length of Rainbow Trout sampled in 2021 was 10 inches and lengths ranged from 8 to 17 inches. Black Bullhead were first sampled in 2013. In January 2015 Diamond Lake was opened to winter trout fishing for the first time and provided increased opportunities for ice anglers. Based on surveys following the opening of the winter season, there are no indications that ice fishing has had an effect on Rainbow Trout sizes or abundance. 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 Diamond 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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