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C

Orchard Lake

Dakota County, MinnesotaEutrophic

Orchard Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. The lake bottoms out at 33 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. At 238 acres, Orchard Lake fits the Minnesota median for monitored lakes, with 3.0 miles of shoreline. Orchard Lake sits at rank 20 of 36 in Dakota County, in the lower half of the local distribution.

Eurasian watermilfoil is established at Orchard Lake, which can dampen recreational access and pressure the native plant community. Orchard Lake's fishery is anchored by muskellunge, with 13 documented species in total — a destination water for muskie anglers. Public access is available — the lake is on the Minnesota PCA public-access list. Ice-out has been recorded 6 times at Orchard Lake, with a median around Apr 8. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-09-24. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 4.8 ft. Phosphorus level: 30 µg/L. Trophic State Index: 54.

MetricValueGrade
Water Clarity (Secchi Depth)4.8 ftD
Phosphorus30 µg/LC
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)54Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Maximum Depth33 ft
Surface Area237.93 acres
Shoreline Length3 mi
Littoral Zone74%
Public AccessYes

Fish Species

black bullhead,black crappie,bluegill,brown bullhead,green sunfish,hybrid sunfish,largemouth bass,northern pike,pumpkinseed,tiger muskellunge,walleye,yellow bullhead,yellow perch

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

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

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

Orchard 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 watermilfoil

Water Quality Trend: Declining

Based on 4 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-1.126 m/yr4
See year-by-year chart →

Ice Season

Historical ice data from Minnesota DNR (9 observations).

Typical Ice-Out
Apr 8
Typical Ice-In
Nov 12

Estimated open water season: 218 days

EarliestLatest
Ice-Out2024-03-03 (2024)2018-05-01 (2018)
Ice-In1991-11-04 (1991)2008-11-24 (2008)

Most recent ice-out: 2024-03-03

Location

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County Ranking

Ranked #20 of 36 lakes in Dakota County

Cleaner Lakes Within 30 Miles

Orchard Lake holds Grade C. One nearby lake has a higher grade.

See full comparison →

Nearby Lakes in Dakota County

DNR Fisheries Survey Summary

14 surveys on file from MN DNR Fisheries. Most recent: 2025-09-04 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Bluegill91.520.14 lb
Largemouth Bass24.630.96 lb
Hybrid Sunfish17.090.18 lb
Pumpkinseed14.170.14 lb
Black Bullhead9.960.57 lb
CNM9.84

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.

Bluegill

153 fish · 27 in · 2022-05-21
47240234567

Largemouth Bass

51 fish · 519 in · 2022-05-21
1050trophy 20681012141618

Hybrid Sunfish

56 fish · 38 in · 2022-05-21
34170345678

Pumpkinseed

28 fish · 37 in · 2022-05-21
105034567

From the 2025-09-04 survey

Minnesota DNR Fisheries IBI program staff conducted an assessment of lakeshore habitat on Orchard Lake on September 4th, 2025, following the Score the Shore survey protocols. The assessment consisted of 32 survey sites evenly spaced 70 meters around the lake. Assessments were made in three habitat zones: Shoreline…

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 Orchard Lake. 3 reports on file.

EPA Impairment Status

Orchard Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Mercury

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

Source: EPA ATTAINS assessment unit MN19-0031-00 · 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: 2024-09-24

Monitoring stations: 1