Lady Slipper Lake
Lyon County, Minnesota286 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Lady Slipper Lake. Here is what has been measured.
- Impaired · Mercury
- 11 ft max depth
- Public access
- Limited data
Lady Slipper Lake in Lyon County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 1 ft visibility. Maximum depth: 11 ft. Surface area: 286.15 acres.
Minnesota DNR's Standard Survey on June 15, 2022 caught 3.50 walleye per gill net at Lady Slipper Lake. Length samples in the latest survey that recorded them ran 4–10 inches. DNR survey details →
Lady Slipper Lake is a 286-acre lake in Lyon County, Minnesota with a maximum depth of 11 feet. Overall water quality is improving over recent sampling years. The lake supports 6 documented fish species including black bullhead, common carp, and hybrid sunfish. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-09-04. Methodology: how these readings are compared.
What Lady Slipper Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Fishing6 species recorded
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Lady Slipper Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Lady Slipper Lake is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lady Slipper Lake
These are the measurements Minnesota PCA publishes for Lady Slipper Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1 ft of visibility. TSI 77.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 77 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Lady Slipper Lake
Answers come straight from the public measurements and survey records on this page.
Minnesota DNR's Standard Survey on June 15, 2022 caught 3.50 walleye per gill net at Lady Slipper Lake. Length samples in the latest survey that recorded them ran 4–10 inches.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Lady Slipper Lake’s water-quality measurements separately, and the water-quality trend over 3 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
DNR Fisheries Survey Summary
12 surveys on file from MN DNR Fisheries. Most recent: 2023-09-11 (Targeted Survey).
12 surveys on file · most recent 2023-09-11 (Targeted Survey)
| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Black Bullhead | 128.27 | 3–9 in 2022-06-15 | 0.17 lb |
| Walleye | 85.39 | 4–10 in 2023-09-11 | 1.15 lb |
| Common Carp | 21.80 | 11–31 in 2022-06-15 | 3.11 lb |
| Yellow Perch | 21.42 | 7–10 in 2022-06-15 | 0.22 lb |
| Bluegill | 2.96 | 7 in 2012-06-18 | 0.4 lb |
CPUE = catch per unit effort, fish caught per net per set in a standardised survey. It measures abundance, not size, and is not a weekly bite report.
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.
Black Bullhead
Walleye
Common Carp
Yellow Perch
From the 2023-09-11 survey
A targeted fall night electrofishing survey was conducted on Lady Slipper during September 11, 2023 to evaluate young of year "YOY" (fingerling sized) Walleye numbers due to a fry stocking. Three electrofishing stations were sampled for a total of 30 minutes. Clarity was poor (1.5 feet). The water temperature was 71…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Lady Slipper Lake. 3 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — Lady SlipperFisheries Lake Survey · MN DNR LakeFinder
- —Fish Stocking History — Lady SlipperFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — Lady SlipperPublic Water Access Sites · MN DNR LakeFinder
Lake Details
Max depth
11 ft
Surface area
286 acres
Shoreline
4.2 mi
Littoral zone
100%
Share shallower than 15 ft
Public access
Yes
Listed by Minnesota PCA
Lake Size & Watershed
Watershed (drainage) area
6 sq mi
HydroLAKES / HydroSHEDS
Elevation
1,056 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Lady Slipper LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Lady Slipper Lake
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Follow Lady Slipper Lake’s readings
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Fish Species
Click a species to see every lake where it is documented.
Fishing Lady Slipper Lake
- → Lady Slipper Lake fishing: DNR survey catch rates, species & stocking
- → Lady Slipper Lake fishing forecast & best times (species outlook + 14-day solunar calendar)
- → Lady Slipper Lake fishing regulations (limits, seasons, special rules)
- → Is it safe to eat fish from Lady Slipper Lake? (mercury & PFAS guide)
Water quality readings over time
3 seasons of samples on record (2021–2025). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Improving3 years
EPA Impairment Status
Lady Slipper Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Fish consumption, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN42-0020-00 · Official waterbody report
Nearby Lakes in Lyon County
Frequently asked questions about Lady Slipper Lake
Where is Lady Slipper Lake?
- Lady Slipper Lake is a lake in Lyon County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Lady Slipper Lake?
- Lady Slipper Lake in Lyon County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 1 ft visibility. Maximum depth: 11 ft. Surface area: 286.15 acres.
Is Lady Slipper Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lady Slipper Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Lady Slipper Lake?
- Lady Slipper Lake has a maximum depth of 11 feet. The lake covers 286.15 acres.
What fish are in Lady Slipper Lake?
- Fish species found in Lady Slipper Lake include black bullhead, common carp, hybrid sunfish, orangespotted sunfish, walleye, yellow perch. Lady Slipper Lake is located in Lyon County, Minnesota.
What did the DNR fisheries survey find at Lady Slipper Lake?
- Minnesota DNR's Standard Survey on June 15, 2022 caught 3.50 walleye per gill net at Lady Slipper Lake. Length samples in the latest survey that recorded them ran 4–10 inches. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Lady Slipper Lake’s water-quality measurements separately, and the water-quality trend over 3 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Lady Slipper Lake?
- Lady Slipper Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lady Slipper Lake. Public access is listed as yes.
Can I fish at Lady Slipper Lake?
- Lady Slipper Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Minnesota's fish and wildlife agency, so check its current regulations before you go.
Explore Lady Slipper Lake across LakeQuality
Depth, room, public access, and the state wake-sport rules
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Fish species and best lakes in Lyon County
Species activity outlook by water temperature and season
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Minnesota's cleanest lakes, ranked on agency measurements
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Where this data comes from
17 measurements from 2 monitoring stations, 2021–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA17 samples · 2021–2025
Analytical methods
- Field measurement/observation, generic method
Monitoring station identifiers (2)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder
Named boat-access points from the USGS National Boat Ramps inventory