Fisheries Lake Survey

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Name: Diamond

Nearest Town: Walker
Primary County: Cass
Survey Date: 08/07/2014
Inventory Number: 11039600

Public Access Information

Ownership Type Description
US Forest Service Concrete WEST SHORE

Lake Characteristics

Lake Area (acres): 76.97
Littoral Area (acres): 62
Maximum Depth (ft): 31
Water Clarity (ft): 12.8 (8-19)

Dominant Bottom Substrate: N/A
Abundance of Aquatic Plants: N/A
Maximum Depth of Plant Growth (ft): N/A

Did you know? MinnAqua Fishing: Get in the Habitat! has a Minnesota-base activity guide for teachers, scout and 4-H leaders, youth leaders, outdoor sports groups, or anyone interested in teaching others about habitat, stewardship and fishing.

Fish Sampled for the 2014 Survey Year


Gear Used

Number of fish per net

Average Fish Weight (lbs)

Normal Range (lbs)


Normal Range

Black Bullhead Gill net 1.00 1.0 - 16.5 0.38 0.3 - 0.7
Rainbow Trout Gill net 33.00 N/A 0.53 N/A
Normal Ranges represent typical catches for lakes with similar physical and chemical characteristics.

Length of Selected Species (Trapnet, Gillnet) Sampled for the 2014 Survey Year

Species Number of fish caught in each category (inches)
0-5 6-8 9-11 12-14 15-19 20-24 25-29 30+ Total
black bullhead 0 1 1 0 0 0 0 0 2
rainbow trout 0 29 26 1 10 0 0 0 66

For the record, the largest Rock Bass (tie) taken in Minnesota weighed 2 lbs. and was caught:

    Where: Lake Winnibigoshish, Cass County
    When: 5/10/98
    Statistics: 12.6" length, 12.4" girth

Fish Stocking Activity

Fish Stocked by Species for the Last Ten Years

Year Species Size Number Pounds
2015 Rainbow Trout yearlings 2,531 112.5
  Rainbow Trout fingerlings 14,000 1,555.6
2014 rainbow trout fingerlings 14,000 1,102.4
  rainbow trout yearlings 7,006 449.1
2013 Rainbow Trout fingerlings 7,000 603.0
2012 Rainbow Trout fingerlings 13,999 1,196.5
2011 Rainbow Trout fingerlings 14,000 1,068.7
2010 Rainbow Trout fingerlings 14,000 1,288.0
2009 Rainbow Trout fingerlings 11,382 989.7
  Rainbow Trout yearlings 7,368 2,739.0
2007 Rainbow Trout fingerlings 13,997 1,516.5
2006 Rainbow Trout fingerlings 15,293 1,349.8

Stocking Notes
1 - indicates fish purchased and stocked by private citizens and sporting groups.
2 - indicates fish purchased by the DNR for stocking.

Stocking Fish Sizes
Fry - Newly hatched fish that are ready to be stocked usually called "swim-ups". Walleye fry are 1/3 of an inch or around 8 mm.
Fingerling - Fingerlings are one to six months old and can range from a size of one to twelve inches depending on the species. Walleye fingerlings range from three to eight inches each fall.
Yearling - Yearling fish are at least one year old. A one-year-old fish can range from three to twenty inches depending on the species. Walleye yearlings average from six to twelve inches.
Adult - Adult fish are fish that have reached maturity. Depending on the species, maturity can be reached at two years of age. Walleye reach maturity between the ages of four and six years.

Fish Consumption Guidelines

No fish consumption guidelines are available for this lake. For more information, see the "Fish Consumption Advice" pages at the Minnesota Department of Health.

Status of the Fishery (as of 08/07/2014)

Diamond Lake (DOW# 11-0396; Lake Class 29) is an 80-acre lake located near Hackensack, MN. There is a US Forest Service public access located on the west shore. Diamond Lake has a shoreline length of 1.86 miles and a maximum depth of 31 feet. Diamond Lake offers excellent Rainbow Trout fishing in a remote, wilderness like setting. The lake is totally 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.

Diamond Lake was first used as a stream trout lake in 1967. Rainbow Trout do not reproduce in this lake and the population is supported entirely by stocking to provide a unique angling opportunity. The average length of Rainbow Trout sampled in gill nets in 2014 was 10 inches and lengths ranged from 6 to 18 inches. Historically, Diamond has produced several fish larger than 15 inches, and the 2014 sample produced the highest observation to date. The lake was chemically treated in October of 2008 to remove competing fish species, specifically Black Crappie, presumed to have been illegally introduced by anglers. These fish eventually overpopulated and stunted, reducing the recreational value of the Rainbow Trout fishery and prompting a costly reclamation process. Excellent Rainbow Trout fishing followed the 2008 reclamation and should continue in future years, provided stocking is maintained and other species are not again introduced by anglers. In the spring of 2014, 7000 yearling Kamloops strain Rainbow Trout were stocked with 14,000 Arlee strain fingerlings stocked in the fall. The Kamloops trout had an adipose fin clip for identification. In January 2015 Diamond Lake was opened to winter Trout fishing, providing increased opportunities for Trout anglers in the Walker area.

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 ( or by contacting the Walker Area Fisheries office.

For more information on this lake, contact:

Area Fisheries Supervisor
07316 State Hwy 371 NW
Walker, MN 56484
Phone: (218) 547-1683
Internet: Walker Fisheries

Lake maps can be obtained from:

Minnesota Bookstore
660 Olive Street
St. Paul, MN 55155
(651) 297-3000 or (800) 657-3757
To order, use C0166,C2759 for the map-id.

For general DNR Information, contact:

DNR Information Center
500 Lafayette Road
St. Paul, MN 55155-4040
TDD: (651) 296-6157 or (888) MINNDNR

Tip Logo    Turn in Poachers (TIP):

    Toll-free: (800) 652-9093