Fisheries Lake Survey

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Name: Riley (Reilly)

Nearest Town: Chanhassen
Primary County: Carver
Survey Date: 06/27/2011
Inventory Number: 10000200
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Public Access Information

Ownership Type Description
City Concrete


Lake Characteristics

Lake Area (acres): 296.21
Littoral Area (acres): 109.6
Maximum Depth (ft): 49
Water Clarity (ft): 8

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


Did you know? The state operates 17 hatcheries: 5 for trout and salmon and 12 for coolwater species.

Fish Sampled for the 2011 Survey Year

Species

Gear Used

Number of fish per net

Average Fish Weight (lbs)

Normal Range (lbs)

Caught

Normal Range

Black Bullhead Trap net 2.33 0.7 - 25.7 0.66 0.3 - 0.6
Gill net 4.17 2.5 - 45.0 0.61 0.3 - 0.7
Black Crappie Trap net 2.22 1.8 - 21.2 0.22 0.2 - 0.3
Gill net 0.50 2.5 - 16.5 0.28 0.1 - 0.3
Bluegill Trap net 50.89 7.5 - 62.5 0.17 0.1 - 0.3
Gill net 21.83 N/A 0.21 N/A
Common Carp Trap net 0.11 0.4 - 2.0 3.86 2.6 - 6.0
Golden Shiner Trap net 0.11 0.2 - 0.8 0.19 0.1 - 0.1
Largemouth Bass Trap net 0.44 0.2 - 0.7 1.46 0.2 - 0.9
Gill net 0.17 0.3 - 0.8 1.34 0.4 - 1.0
Northern Pike Trap net 1.00 N/A 2.00 N/A
Gill net 15.17 1.5 - 7.3 3.65 2.0 - 3.5
Pumpkinseed Trap net 0.33 0.7 - 4.2 0.09 0.1 - 0.2
Gill net 0.17 N/A 0.13 N/A
Rock Bass Trap net 0.11 0.1 - 0.8 0.24 0.2 - 0.5
Walleye Trap net 0.33 0.3 - 1.2 2.89 0.8 - 2.8
Gill net 1.17 1.2 - 6.3 2.67 1.2 - 2.7
White Sucker Gill net 0.67 0.4 - 2.2 2.93 1.5 - 2.4
Yellow Bullhead Trap net 1.78 0.9 - 5.7 0.68 0.5 - 0.8
Gill net 6.83 0.5 - 7.5 0.49 0.5 - 0.8
Yellow Perch Gill net 11.67 2.0 - 27.9 0.15 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 2011 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 7 36 3 0 0 0 0 46
black crappie 7 13 3 0 0 0 0 0 23
bluegill 201 378 0 0 0 0 0 0 589
common carp 0 0 0 0 0 1 0 0 1
golden shiner 0 1 0 0 0 0 0 0 1
largemouth bass 1 1 0 1 2 0 0 0 5
northern pike 0 0 1 0 20 42 16 18 100
pumpkinseed 4 0 0 0 0 0 0 0 4
rock bass 0 1 0 0 0 0 0 0 1
walleye 0 0 0 0 6 4 0 0 10
white sucker 0 0 0 0 3 1 0 0 4
yellow bullhead 1 29 14 13 0 0 0 0 57
yellow perch 21 46 0 0 0 0 0 0 70


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 Stocking Activity

Fish Stocked by Species for the Last Ten Years

Year Species Size Number Pounds
2012 Yellow Perch1 adults 3,000 375.0
2010 Walleye1 fingerlings 3,000 150.0
2008 Walleye1 fingerlings 2,200 88.0
2007 Walleye1 fingerlings 1,760 320.0
2006 Walleye1 fingerlings 1,500 125.0
2004 Walleye1 fingerlings 3,600 367.0

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

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
RILEY
Carver Co., 10000200
Bluegill Sunfish   All sizes     Mercury
Bullhead   All sizes     Mercury
Carp   All sizes     Mercury
Crappie   All sizes     Mercury
Northern Pike   All sizes     Mercury
Walleye     All sizes   Mercury

General Population

LAKE NAME
County, DOWID
Species Meal Advice Contaminants
Unrestricted 1 meal/week 1 meal/month Do not eat
RILEY
Carver Co., 10000200
Bluegill Sunfish All sizes        
Bullhead All sizes        
Carp   All sizes     Mercury
Crappie   All sizes     Mercury
Northern Pike All sizes        
Walleye   shorter than 21" 21" or longer   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 06/27/2011)

Lake Riley is a 296 acre lake with a maximum depth of 49 feet, located between the cities of Chanhassen and Eden Prairie. Lake Riley provides abundant recreational opportunities. Fishing and boating are very popular. Beaches provide swimming opportunities and a fishing pier is located on the eastern shore. Water quality in Lake Riley is good, compared to other West Metro lakes. By late summer most species of fish cannot inhabit water deeper than 18 feet for extended periods of time. Anglers should keep this in mind when pursuing walleye and northern pike. Fishing in water deeper than 18 feet in mid to late summer could yield very few fish. Boaters should also keep in mind that new state laws require the drain plug be removed while traveling on public roadways.

The predator community in Lake Riley is typical of many Minnesota lakes. Stocking of walleye occurs. Fingerlings are purchased by the Lake Riley Association. Walleye average length was 19.7 inches. Average weight was 2.67 pounds. Abundance was in the average range for this type of lake. Walleye mean weight was above average. Northern pike numbers were within the historic average for Lake Riley. Compared to similar lakes, northern pike abundance is very high. Average length was 24.0 inches. In the 2011 population assessment largemouth bass abundance increased slightly compared to past surveys, but is average for lakes similar to Riley. Average length was 12.3 inches. Standard lake survey gear does not consistently provide an accurate estimate of largemouth bass abundance.

Five species of panfish are present in Lake Riley. Black crappie abundance is below average. Very few large fish were sampled. Average length was 7.3 inches. Bluegill abundance decreased slightly compared to the 2005 survey, but stayed within the historic range. Abundance remains above average compared to other lakes. Over 70% of sampled bluegill were 6 inches or larger. Less than 1% were 8 inches. Yellow perch abundance in Lake Riley is average. Mean weight of yellow perch was above average. Average length was 6.9 inches. Pumpkinseed were sampled at a low abundance. Hybrid sunfish and golden shiner were also sampled.

Rough fish are present. Common carp abundance increased slightly since the 2005 survey, but remains below average for this class of lakes. Black bullhead were also sampled at as abundance well below the historic average for Lake Riley. Yellow bullhead were sampled at an all-time high for this lake. Overall, yellow bullhead is above average compared to similar lakes. White sucker are present in low numbers, but average weight is high.


For more information on this lake, contact:

Area Fisheries Supervisor
7050 E Hwy 101, Suite 100
Shakopee, MN 55379
Phone: (952) 496-4141
Internet: West Metro Fisheries
E-Mail: MetroWest.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 C0956 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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