Fisheries Lake Survey

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Name: Mahnomen Mine ( Mahnomen Alstead & Arco)

Nearest Town: Armour Number Two Mine
Primary County: Crow Wing
Survey Date: 07/12/2010
Inventory Number: 18044000

Public Access Information

Ownership Type Description
DNR Channel Public access on west end of Pennington Mine then through channel on northeast shore to Mahnomen.


Lake Characteristics

Lake Area (acres): 193.08
Littoral Area (acres): 53
Maximum Depth (ft): 525
Water Clarity (ft): 31.5 (25-38)

Dominant Bottom Substrate: Sand (Abundant)
Abundance of Aquatic Plants: 23 Varieties Sampled
Maximum Depth of Plant Growth (ft): 14.1 (0-20)


Did you know? Lake rehabilitation projects reclaim waters suffering from habitat degradation and overpopulation of some fish species.

Fish Sampled for the 2010 Survey Year

Species

Gear Used

Number of fish per net

Average Fish Weight (lbs)

Normal Range (lbs)

Caught

Normal Range

Black Crappie Trap net 2.00 0.5 - 2.2 0.36 0.3 - 0.5
Gill net 0.69 0.3 - 1.7 0.81 0.2 - 0.5
Bluegill Trap net 13.27 7.7 - 43.4 0.12 0.1 - 0.2
Gill net 0.54 N/A 0.25 N/A
Bowfin (dogfish) Trap net 0.36 0.3 - 1.0 4.86 2.6 - 4.9
Burbot Gill net 0.15 0.2 - 0.3 1.49 1.5 - 3.0
Hybrid Sunfish Trap net 0.09 N/A 0.39 N/A
Largemouth Bass Trap net 0.27 0.4 - 1.5 0.10 0.2 - 0.7
Gill net 0.46 0.5 - 1.7 0.94 0.5 - 1.2
Northern Pike Trap net 0.45 N/A 0.57 N/A
Gill net 1.69 2.2 - 8.7 5.02 1.5 - 3.2
Pumpkinseed Trap net 0.45 1.4 - 5.9 0.05 0.1 - 0.2
Rock Bass Trap net 0.09 0.8 - 3.7 0.13 0.2 - 0.4
Gill net 0.08 0.7 - 4.4 0.07 0.2 - 0.4
Smallmouth Bass Gill net 1.46 0.2 - 1.6 1.98 0.8 - 1.8
Walleye Gill net 0.31 1.0 - 5.0 4.75 1.2 - 3.0
White Sucker Gill net 0.31 0.5 - 2.0 0.43 1.6 - 2.6
Yellow Bullhead Trap net 0.91 1.0 - 5.3 0.72 0.5 - 0.9
Gill net 0.54 1.0 - 6.0 0.95 0.4 - 0.7
Yellow Perch Trap net 1.36 0.4 - 2.3 0.12 0.1 - 0.2
Gill net 8.00 1.5 - 13.8 0.20 0.1 - 0.2
Normal Ranges represent typical catches for lakes with similar physical and chemical characteristics.


Length of Selected Species (Trapnet, Gillnet) Sampled for the 2010 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 crappie 2 14 13 2 0 0 0 0 31
bluegill 110 38 0 0 0 0 0 0 153
bowfin (dogfish) 0 0 0 0 0 3 1 0 4
burbot 0 0 0 1 0 1 0 0 2
hybrid sunfish 0 1 0 0 0 0 0 0 1
largemouth bass 1 2 4 2 0 0 0 0 9
northern pike 0 0 4 4 3 3 5 8 27
pumpkinseed 5 0 0 0 0 0 0 0 5
rock bass 2 0 0 0 0 0 0 0 2
smallmouth bass 0 0 5 3 11 0 0 0 19
walleye 0 0 0 0 0 3 1 0 4
white sucker 0 0 4 0 0 0 0 0 4
yellow bullhead 0 0 10 7 0 0 0 0 17
yellow perch 11 99 9 0 0 0 0 0 119


For the record, the largest Chinook Salmon (King) taken in Minnesota weighed 33 lbs., 4 oz. and was caught:

    Where: Poplar River, Cook County
    When: 9/23/89
    Statistics: 44.75" length, 25.75" girth

    and by

    Where: 10/12/89
    When:
    Statistics: Lake Superior, St. Louis County

Fish Consumption Guidelines

These fish consumption guidelines help people make choices about which fish to eat and how often. Following the guidelin es enables people to reduce their exposure to contaminants while still enjoying the many benefits from fish.

Pregnant Women, Women who may become pregnant and Children under age 15

LAKE NAME
County, DOWID
Species Meal Advice Contaminants
Unrestricted 1 meal/week 1 meal/month Do not eat
MAHNOMEN, ALSTEAD & ARCO
Crow Wing Co., 18044000
Bluegill Sunfish   All sizes     Mercury
Northern Pike   shorter than 31" 31" or longer   Mercury
Smallmouth Bass   All sizes     Mercury

General Population

LAKE NAME
County, DOWID
Species Meal Advice Contaminants
Unrestricted 1 meal/week 1 meal/month Do not eat
MAHNOMEN, ALSTEAD & ARCO
Crow Wing Co., 18044000
Bluegill Sunfish All sizes        
Northern Pike   All sizes     Mercury
Smallmouth Bass   All sizes     Mercury

DOWID - MN DNR, Division of Waters' lake ID number.

Contaminants listed were measured at levels that trigger advice to limit consumption.

Listing of consumption guidelines do not imply the fish are legal to keep, MN DNR fishing regulations should be consulted.

Dioxin
Mercury
PCBS - Polychlorinated biphenyls
PFOS - Perfluorooctane sulfanate


Status of the Fishery (as of 07/12/2010)

Mahnomen Mine Pit Lake is a complex of former open pit iron mines located north of Ironton that has filled with water. The Mahnomen complex includes (from east to west) the Mahnomen No. 1, Louise, Mahnomen No. 2 and 3, Arco, and Alstead mines. Mahnomen Mine Pit Lake is the largest mine pit lake in the Cuyuna Range at 270 acres and the deepest at over 500 ft in Mahnomen No 1. The water is very clear with visibility to a depth of nearly 30 ft. A concrete boat launch is located on the west end of Pennington Mine. A channel on the northeast end of Pennington connects to Mahnomen Mine. Mahnomen is within the Cuyuna Country State Recreation Area.

Mahnomen is a designated stream trout lake. Designated stream trout lakes have additional angling regulations. Be sure to consult the current Minnesota Fishing Regulations book for regulations, seasons, and possession limits before fishing designated trout waters.

A survey of the fish community and aquatic habitat in Mahnomen Mine Pit Lake was conducted in 2010. The fish community was assessed with 13 gill net and 11 trap net sets. The total catch in the gill nets was fairly low at 14.2 fish per set, but this was comparable to other Cuyuna mine pit lakes where average gill net catches have ranged from 2 to 63 total fish in recent surveys (median 9.7). Yellow perch were the most common fish in the gill nets with a catch of 8.0 fish per net. The northern pike gill net catch was only 1.7 per set, but they comprised about one-half of the gill net catch biomass with a mean weight of 5 lbs per fish. Northern pike captured in the gill nets ranged in length from 11 to 41 inches with an average length of 26 inches. Smallmouth bass were the third most common fish in the gill nets and were fairly large with a mean length of nearly 15 inches; the largest was 18.9 inches long. A few large walleyes were captured in the gill nets.

Bluegills were the most common fish in the trap nets with average catch of 13 per set. Most bluegills were from 3 to 7 inches long. Black crappies were the second most abundant species in the trap nets at 2 per net and about 60% were greater than 8 inches, while in the gill nets most black crappies were around 10 to 13 inches long. Catch of other species was fewer than 2 fish per trap net.

Temperature and oxygen conditions suitable for trout occurred from a depth of about 20 ft down to about 85 ft. The water was extremely clear with visibility over 25 ft. The water chemistry had low phosphorus and chlorophyll, but had fairly high ionic strength and alkalinity.

Near shore substrates were primarily sand and gravel. The aquatic vegetation was fairly diverse compared to other nearby mine pit lakes; 23 species or species groups were identified in the August survey. Submerged trees which extend nearly to the surface are common in areas of medium depth - about 10 to 30 ft deep.

Stocking plans and stocking histories for the Mahnomen Mine Pit complex are all stored under the records for Pennington Mine Pit Lake (18-0439-00). See the Pennington Mine 2010 survey report for more stocking and survey information.


For more information on this lake, contact:

Area Fisheries Supervisor
1601 Minnesota Dr
Brainerd, MN 56401
Phone: (218) 828-2550
Internet: Brainerd Fisheries
E-Mail: Brainerd.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 B0522 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

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