Fisheries Lake Survey

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Nearest Town: 9 mi. N & 3 mi. W of Ely
Primary County: St. Louis
Survey Date: 05/26/2004
Inventory Number: 69-0081-00

Public Access Information

Ownership Type Description
Other Carry-in Public portage established through prescriptive use. Trail is approximately 1/2 mi. & crosses private land.

Lake Characteristics

Lake Area (acres): 10.40
Littoral Area (acres): 7.20
Maximum Depth (ft): 34.00
Water Clarity (ft): 9.00

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

Did you know? Much of Minnesota's fisheries program is reimbursed by the Federal Aid in Sport Fish Restoration Program (federal excise tax), administered by the U.S. Fish and Wildlife Service.

Fish Sampled up to the 2004 Survey Year


Gear Used

Number of fish per net

Average Fish Weight (lbs)

Normal Range (lbs)


Normal Range

Brook Trout Gill net 1.0 N/A - N/A 0.10 N/A - N/A
White Sucker Gill net 3.5 1.0 - 8.9 0.98 0.4 - 1.7
Normal Ranges represent typical catches for lakes with similar physical and chemical characteristics.

Length of Selected Species Sampled for All Gear for the 2004 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
Brook Trout 0 2 0 0 0 0 0 0 2

For the record, the largest Shortnose Gar taken in Minnesota weighed 4 lbs., 9.6 oz. and was caught:

    Where: Mississippi River, Hennepin County
    When: 7/22/84
    Statistics: 34.6" length, 10" girth

Fish Stocking Activity

Fish Stocked by Species for the Last Ten Years

Year Species Size Number Pounds
2010 Brook Trout fingerlings 756 20.0
2009 Brook Trout fingerlings 750 14.3
2008 Brook Trout fingerlings 858 26.0
2007 Brook Trout fingerlings 974 29.0
2006 Brook Trout fingerlings 761 22.0

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 05/26/2004)

Regenbogen Lake is in Ecological Lake Class 9, which consists of 48 lakes in northeast Minnesota that are small, shallow, and round, and have very soft (unmineralized) water. Regenbogen Lake was thermally stratified on 05/26/2004 with a surface temperature of 54 F and a bottom temperature of 41 F. Adequate oxygen for trout (more than 5 ppm) was retained to a depth of 14 ft, where the temperature was 45 F. Adequate oxygen for warmwater fish (more than 2 ppm) was retained to a depth of 15 ft, where the temperature was 44 F. Under-ice oxygen has dropped below 2 ppm in severe winters, the most recent of which was in 1996 when a maximum of 1.5 ppm was found. Two small inlets drain local swamps and there is no outlet. Lake bottom substrates along the shoreline are mostly sand, with some muck, ledgerock, and boulder. Aquatic vegetation is sparse and consists mostly of shoreline fringe plants and waterlilies.

Regenbogen Lake was poisoned with rotenone in 1955, which removed indigenous populations of northern pike, yellow perch, largemouth bass, and minnows. Rainbow trout were stocked annually from 1958 through 1983, and brook trout fingerlings were stocked annually from 1984 to the present. Eleven trout stocking assessments from 1977 through 2004 used 1-4 gillnets, set mostly in late May or early June.

Two 6" brook trout were caught in the 2004 assessment. Both of these trout had been stocked the previous fall as fingerlings. One of these trout had insect remains in its stomach, the other had an empty stomach.

By weight, the trout catch of 0.1 lb/gillnet in 2004 was lower than the median catch of 1.0 lb/gillnet in all previous assessments on this lake and was lower than the median trout catch (all species combined) of 2.5 lbs/gillnet in recent assessments of 25 stream trout lakes in the Tower Fisheries Management Area.

White sucker (3.5/gillnet, averaging 13" in length) were also captured in the 2004 assessment. Low numbers of sucker (0.5-5.0/gillnet) have been captured in most assessments since they were first observed in 1980.

For more information on this lake, contact:

Area Fisheries Supervisor
650 Hwy 169
Tower, MN 55790
Phone: (218) 753-2580
Internet: Tower 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 C0833 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

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