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F

Little Waverly Lake

Wright County, MinnesotaHypereutrophic

Little Waverly Lake earns an F: 673 µg/L of phosphorus and clarity at 1.2 ft signal heavy nutrient loading from the surrounding watershed. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.

Hypereutrophic conditions mean the lake is operating at the upper end of the productivity scale, with all the bloom risk that implies. At only 12 ft deep, Little Waverly Lake is shallow — wind keeps the water column mixed and sediment resuspension drives phosphorus levels harder to manage. Little Waverly Lake covers 338 acres alongside 3.8 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within the 64 graded lakes of Wright County, Little Waverly Lake sits at rank 58, near the bottom of the county list.

Little Waverly Lake is on the Minnesota infested-waters list for zebra mussels — boaters should follow clean-drain-dry protocols when moving gear to or from the lake. Walleye are documented at Little Waverly Lake, one of 16 fish species on record for the lake. A documented public access point at Little Waverly Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The lake has a partial ice record — 9 observed ice-outs, centered near Mar 30. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-09-15. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

Very murky, less than 1.2 ft of visibility. Phosphorus level: 672.5 µg/L. Trophic State Index: 86.

MetricValueGrade
Water Clarity (Secchi Depth)1.2 ftF
Phosphorus672.5 µg/LF
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)86Hypereutrophic

Very high nutrients, dense algae, poor clarity

Lake Details

CharacteristicValue
Maximum Depth12 ft
Average Depth6.7 ft
Surface Area338.01 acres
Shoreline Length3.8 mi
Littoral Zone100%
Public AccessYes

Fish Species

bigmouth buffalo,black bullhead,black crappie,bluegill,brown bullhead,channel catfish,common carp,green sunfish,hybrid sunfish,largemouth bass,northern pike,pumpkinseed,walleye,white sucker,yellow bullhead,yellow perch

Click a species to see all Minnesota and Wisconsin lakes where it is found.

→ Best fishing times for Little Waverly Lake (14-day solunar calendar)

→ Is it safe to eat fish from Little Waverly Lake? (mercury & PFAS guide)

Little Waverly Lake fishing regulations (limits, seasons, special rules)

Invasive & Introduced Species

Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.

Eurasian watermilfoilzebra mussel

Water Quality Trend: Declining

Based on 5 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.243 m/yr5
Phosphorus Declining+66.1 µg/L/yr5
See year-by-year chart →

Ice Season

Historical ice data from Minnesota DNR (17 observations).

Typical Ice-Out
Mar 30
Typical Ice-In
Nov 28

Estimated open water season: 243 days

EarliestLatest
Ice-Out2016-03-13 (2016)2018-05-01 (2018)
Ice-In2014-11-10 (2014)2016-12-07 (2016)

Most recent ice-out: 2018-05-01

Location

Loading map…

County Ranking

Ranked #58 of 64 lakes in Wright County

Cleaner Lakes Within 30 Miles

Little Waverly Lake holds Grade F. 4 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Wright County

Hypereutrophic Lakes in Minnesota

DNR Fisheries Survey Summary

8 surveys on file from MN DNR Fisheries. Most recent: 2024-09-03 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Largemouth Bass27.561.81 lb
Green Sunfish25.910.1 lb
Black Bullhead23.850.63 lb
GOS21.740.09 lb
Black Crappie16.920.27 lb
Yellow Perch15.340.12 lb

CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.

Length Distributions

Number of fish caught at each inch class in the most recent survey that recorded lengths. Red dashed line marks an approximate trophy threshold for that species.

Largemouth Bass

21 fish · 819 in · 2024-09-03
530trophy 208910111213141516171819

Green Sunfish

3 fish · 15 in · 2004-07-12
21012345

Black Bullhead

35 fish · 814 in · 2024-09-03
630891011121314

GOS

8 fish · 56 in · 2024-07-15
42056

From the 2024-09-03 survey

A targeted survey of nearshore fish species in Little Waverly Lake, was conducted on September 3 - September 9, 2024, by Index of Biological Integrity (IBI) Program staff. Sampling sites were evenly spaced around the lake, and each was sampled by backpack electrofishing and seining with a 50-foot or 15-foot seine,…

Source: MN DNR LakeFinder Fisheries Lake Survey

DNR Reports & Resources

Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Little Waverly Lake. 2 reports on file.

Reservoir Info (USACE NID)

Little Waverly Lake is a man-made reservoir impounded by the Little Waverly Lake (completed 1938), built primarily for recreation on the Twelvemile Creek; gravity-type dam, 7 ft tall and 81 ft long.

Surface area
330 ac
Normal storage
1,946 ac-ft
Max storage
2,780 ac-ft
Drainage area
59.9 sq mi
Hazard class
Low
Owner
MNDNR

Source: USACE National Inventory of Dams, NID ID MN00403 · Operator website

EPA Impairment Status

Little Waverly Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Impaired biota (cause unknown)MercuryNutrients (phosphorus, nitrogen)

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MN86-0106-00 · Official waterbody report

Data Sources

Water quality data from the EPA Water Quality Portal

Impairment status from EPA ATTAINS 303(d) database

Grading methodology based on Metropolitan Council standards

Lake details from Minnesota DNR LakeFinder

Ice data from Minnesota DNR Climate

Most recent sample: 2024-09-15

Monitoring stations: 2