Lone Lake
Mahnomen County, Minnesota112 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Lone Lake. Here is what has been measured.
- Eutrophic
- 22 ft max depth
- Public access
- Limited data
Lone Lake in Mahnomen County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 7.1 ft visibility. Phosphorus: 48.5 µg/L. Chlorophyll-a (algae): 24 µg/L. Maximum depth: 22 ft. Surface area: 112.44 acres.
Minnesota DNR's Standard Survey on July 20, 1987 caught 3.25 northern pike per gill net at Lone Lake. DNR survey details →
Lone Lake is a 112-acre productive, nutrient-rich eutrophic lake in Mahnomen County, Minnesota with a maximum depth of 22 feet (13-foot average). Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 11 other monitored lakes in Mahnomen County, Lone Lake ranks #11 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-09-12. Methodology: how these readings are compared.
What Lone Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lone 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 Lone Lake
These are the measurements Minnesota PCA publishes for Lone Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 7.1 ft. Phosphorus 48.5 µg/L. Chlorophyll-a 24 µg/L. TSI 57.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 7.1ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 48.5µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 24µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 57 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Lone Lake
Answers come straight from the public measurements and survey records on this page.
Minnesota DNR's Standard Survey on July 20, 1987 caught 3.25 northern pike per gill net at Lone Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Lone Lake’s water-quality measurements separately. Catch rate is not a swim clearance and is not a weekly bite report.
DNR Fisheries Survey Summary
2 surveys on file from MN DNR Fisheries. Most recent: 1987-07-20 (Standard Survey).
2 surveys on file · most recent 1987-07-20 (Standard Survey)
39 years old| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Brown Bullhead | 20.58 | 0.27 lb | |
| Black Bullhead | 20.13 | 0.85 lb | |
| Yellow Perch | 12.53 | 0.26 lb | |
| Pumpkinseed | 2.13 | 0.18 lb | |
| Yellow Bullhead | 2.12 | 0.49 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.
From the 1987-07-20 survey
NORTHERN PIKE NUMBERS ARE SLIGHTLY HIGHER THAN STATEWIDE MEDIANS BUT LOWER THAN THE LOCAL MEDIANS CENTRARCHID SPECIES NUMBERS ARE WELL BELOW THE STATE AND LOCAL MEDIAN WITH ROUGHFISH BEING REPORTED AT HIGHER LEVELS THAN THE STATE AND LOCAL AVERAGES.
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Lone Lake. 4 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — LoneFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Lone (0102)Aquatic Plant Report · MN DNR LakeFinder
- —Aquatic Plant Report — Lone (1709)Aquatic Plant Report · MN DNR LakeFinder
- —Public Water Access Sites — LonePublic Water Access Sites · MN DNR LakeFinder
Lake Details
Max depth
22 ft
Average depth
13 ft
Surface area
112 acres
Shoreline
2.3 mi
Littoral zone
93%
Share shallower than 15 ft
Public access
Yes
Listed by Minnesota PCA
Lake Size & Watershed
Watershed (drainage) area
19 sq mi
HydroLAKES / HydroSHEDS
Elevation
1,450 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Lone 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 Lone Lake
Compare lakeside cabins, hotels, and vacation rentals near Lone Lake in Mahnomen County, Minnesota — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Lone Lake are listed below.
Top-rated places to stay near Lone Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Minnesota’s top lakes →
Follow Lone Lake’s readings
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Fishing Lone Lake
Nearby Lakes in Mahnomen County
Frequently asked questions about Lone Lake
Where is Lone Lake?
- Lone Lake is a lake in Mahnomen County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Lone Lake?
- Lone Lake in Mahnomen County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 7.1 ft visibility. Phosphorus: 48.5 µg/L. Chlorophyll-a (algae): 24 µg/L. Maximum depth: 22 ft. Surface area: 112.44 acres.
Is Lone Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Lone Lake?
- Lone Lake has a maximum depth of 22 feet and an average depth of 13 feet. The lake covers 112.44 acres.
What did the DNR fisheries survey find at Lone Lake?
- Minnesota DNR's Standard Survey on July 20, 1987 caught 3.25 northern pike per gill net at Lone Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Lone Lake’s water-quality measurements separately. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Lone Lake?
- Lone Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lone Lake. Public access is listed as yes.
Can I fish at Lone Lake?
- Lone 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 Lone Lake across LakeQuality
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Fish species and best lakes in Mahnomen County
Species activity outlook by water temperature and season
Where to stay at Minnesota's top lakes, each with its readings
Lakes in the Red River of the North Watershed, ranked by water quality
Minnesota's cleanest lakes, ranked on agency measurements
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Where this data comes from
34 measurements from 2 monitoring stations, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Chippewa Tribe, Minnesota (White Earth Band) (Tribal)
WEARTH_WQX34 samples · 2024
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- Turbidity by Nephelometry
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder
Named boat-access points from the USGS National Boat Ramps inventory