Lake information report

Name: REGENBOGEN

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? Ongoing habitat improvement and maintenance work is conducted on trout streams that have publicly owned land or easements.

Fish Sampled up to the 2004 Survey Year

Species	Gear Used	Number of fish per net		Average Fish Weight (lbs)	Normal Range (lbs)
Species	Gear Used	Caught	Normal Range	Average Fish Weight (lbs)	Normal Range (lbs)
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)
Species	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 White Crappie taken in Minnesota weighed 3 lbs., 15 oz. and was caught:

Where: Lake Constance, Wright County
When: 7/28/02
Statistics: 18" length, 16" 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
2005	Brook Trout	fingerlings	823	27.0
2004	Brook Trout	fingerlings	770	22.0
2003	Brook Trout	fingerlings	758	24.0

Privately Stocked Fish
* indicates privately stocked fish. Private stocking includes fish purchased by the DNR for stocking and fish purchased and stocked by private citizens and sporting groups.

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 E-Mail: Tower.Fisheries@state.mn.us	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 Internet: www.dnr.state.mn.us E-Mail: info.dnr@state.mn.us	Turn in Poachers (TIP): Toll-free: (800) 652-9093