Fisheries Lake Survey

printer friendly version

Name: Little Rock

Nearest Town: Rice
Primary County: Benton
Survey Date: 06/22/2009
Inventory Number: 05001300

Public Access Information

Ownership Type Description
DNR Concrete
County Gravel


Lake Characteristics

Lake Area (acres): 1310.58
Littoral Area (acres): 1392
Maximum Depth (ft): 23
Water Clarity (ft): 1.5

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


Did you know? Habitat acquisition of lands next to lakes and streams protects spawning areas and shoreline vegetation, and it increases access to fishing waters.

Fish Sampled for the 2009 Survey Year

Species

Gear Used

Number of fish per net

Average Fish Weight (lbs)

Normal Range (lbs)

Caught

Normal Range

Bigmouth Buffalo Trap net 0.50 0.2 - 1.5 4.05 1.3 - 5.1
Gill net 0.18 0.3 - 6.1 3.17 N/A
Black Bullhead Trap net 0.80 1.3 - 78.1 0.64 0.2 - 0.6
Gill net 1.27 4.6 - 83.0 0.71 0.2 - 0.6
Black Crappie Trap net 4.60 1.0 - 12.3 0.33 0.2 - 0.5
Gill net 6.18 0.8 - 11.1 0.34 0.2 - 0.4
Bluegill Trap net 2.90 1.0 - 14.9 0.27 0.2 - 0.4
Bowfin (dogfish) Trap net 0.10 0.1 - 0.7 3.95 3.7 - 5.1
Brown Bullhead Gill net 0.09 0.6 - 7.7 0.73 0.4 - 1.1
Channel Catfish Trap net 0.30 N/A 3.81 N/A
Gill net 4.00 N/A 3.99 N/A
Common Carp Trap net 1.00 0.7 - 5.1 6.56 2.3 - 5.6
Gill net 0.55 0.5 - 9.1 6.24 1.0 - 4.9
Common Shiner Trap net 0.10 N/A 0.07 N/A
Largemouth Bass Trap net 0.30 0.1 - 0.8 1.11 0.4 - 1.5
Northern Pike Trap net 0.20 N/A 2.67 N/A
Gill net 1.00 1.2 - 7.8 3.14 1.5 - 3.0
Shorthead Redhorse Trap net 0.80 0.7 - 2.1 2.59 1.7 - 3.5
Gill net 0.73 0.6 - 2.8 2.05 1.5 - 2.2
Silver Redhorse Trap net 1.30 N/A 5.42 N/A
Gill net 0.09 N/A 3.36 N/A
Walleye Trap net 0.50 0.3 - 1.7 1.94 0.9 - 2.4
Gill net 0.64 3.2 - 15.3 1.37 0.9 - 1.9
White Sucker Trap net 0.70 0.3 - 1.3 2.48 1.3 - 2.6
Gill net 7.36 0.8 - 5.9 2.19 1.4 - 2.2
Yellow Bullhead Gill net 0.09 0.3 - 3.6 0.71 0.5 - 0.9
Yellow Perch Gill net 0.64 3.0 - 22.5 0.49 0.1 - 0.4
Normal Ranges represent typical catches for lakes with similar physical and chemical characteristics.


Length of Selected Species (Trapnet, Gillnet) Sampled for the 2009 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
bigmouth buffalo 0 0 0 0 7 0 0 0 7
black bullhead 0 2 19 1 0 0 0 0 22
black crappie 2 99 12 0 0 0 0 0 114
bluegill 11 18 0 0 0 0 0 0 29
bowfin (dogfish) 0 0 0 0 0 1 0 0 1
brown bullhead 0 0 1 0 0 0 0 0 1
channel catfish 0 0 0 0 7 36 4 0 47
common carp 0 0 0 0 2 11 1 2 16
common shiner 1 0 0 0 0 0 0 0 1
largemouth bass 0 0 0 3 0 0 0 0 3
northern pike 0 0 0 1 0 7 5 0 13
shorthead redhorse 0 0 0 0 16 0 0 0 16
silver redhorse 0 0 0 0 1 13 0 0 14
walleye 0 0 0 4 7 1 0 0 12
white sucker 0 0 0 0 85 1 0 0 88
yellow bullhead 0 0 1 0 0 0 0 0 1
yellow perch 0 1 5 0 0 0 0 0 7


For the record, the largest Tullibee taken in Minnesota weighed 5 lbs., 11.8 oz. and was caught:

    Where: Little Long Lake, St. Louis County
    When: 4/16/02
    Statistics: 20.45" length, 16.4" girth

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
LITTLE ROCK
Benton Co., 05001300
Crappie All sizes        
Northern Pike   All sizes     Mercury
Walleye   All sizes     Mercury
White Sucker All sizes        

General Population

LAKE NAME
County, DOWID
Species Meal Advice Contaminants
Unrestricted 1 meal/week 1 meal/month Do not eat
LITTLE ROCK
Benton Co., 05001300
Crappie All sizes        
White Sucker All sizes        

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 06/22/2009)

Little Rock Lake is the largest lake in Benton County. Though large, its development and recreational value has been limited by poor water quality. The lake has a history of severe algae blooms in mid to late summer, which affect both the recreational value and the fish community. At the time of the 2009 survey in mid-June the secchi disk reading was 1.5 feet and the water looked like pea-soup. Algae coated the survey nets which likely affected the efficiency of the nets. Little Rock Lake is a popular destination when walleye season opens but by early June, few boats are found on the lake after algae blooms begin. The lake likely receives more fishing pressure during winter rather than summer. A wide connection to the Mississippi River has some influence on the fish species composition in the lake. Lack of vegetation and the turbid water make the lake less suitable for largemouth bass and bluegill. Black crappie, channel catfish, and white sucker were the most numerous fish species sampled in the 2009 summer survey. In winter, Little Rock Lake is a popular crappie fishing lake. Most of the crappie in the 2009 summer survey, however, were less than 9 inches in length, but by winter the fish may have reached a size acceptable to anglers. Occasional strong year classes appear to sustain the crappie population as most of the fish looked to be from the 2005 year class. The channel catfish caught in the survey averaged about 22 inches or 4 pounds and abundance has remained about the same since the last survey in 2002. All white sucker caught were over 15 inches in length. Other species in the sucker family found in Little Rock Lake are shorthead redhorse and silver redhorse. Common carp and bigmouth buffalo were also caught in the summer survey and abundance appears to be within the normal range when compared to similar type lakes. Carp bowfishing has become increasingly popular and Little Rock Lake has an abundance of shallow flats to accommodate the sport. Catches of many of the species was low due to netting conditions. Walleye natural reproduction has been successful at maintaining the population and meeting fishing pressure. The low walleye catch may have been due to the natural fluctuation of reproduction success and poor netting conditions as most of the walleye in the 2009 survey came from the 2005 year class with only a few from other year classes. The northern pike catch was down from the previous survey but a range of sizes was documented. Although the average size in the survey was 24 inches or 3 pounds, past surveys have caught fish over 36 inches. Yellow perch also showed a drop in abundance with the catch being the lowest to date for Little Rock Lake, and below the normal range for similar type lakes. Although perch can be an important prey species for walleye and northern pike, there are likely enough other prey species like white sucker that have filled that niche. All three species of bullhead were caught in Little Rock Lake, but abundance appears to be low for all three. The black bullhead, which tend to be more tolerant of turbid water, were the most numerous of the three species. Improving the water quality in Little Rock Lake has been a goal of an active lake association as well as local government and state agencies. Work has been done with landowners in the watershed to reduce nutrient run-off to streams feeding the lake. The Benton County Soil and Water Conservation District is conducting a TMDL (Total Maximum Daily Load) study on the lake to identify nutrient sources and needed remedies.


For more information on this lake, contact:

Area Fisheries Supervisor
16543 Haven Rd
Little Falls, MN 56345
Phone: (320) 616-2450
Internet: Little Falls Fisheries
E-Mail: LittleFalls.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 B0314 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

Tip Logo    Turn in Poachers (TIP):

    Toll-free: (800) 652-9093