Lone Lake
Lone Lake in Mahnomen County, Minnesota has a water quality grade of D (Nutrient-rich). 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.
- Clarity
- 7.1 ft
- Max depth
- 22 ft
- Area
- 112 acres
- Type
- Eutrophic
- Public access
- Yes
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Lone Lake →
Next lake in Mahnomen County
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). Water quality is graded D based on 2 sampling years through 2024. 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. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
Moderate clarity, visible to about 7.1 ft. Phosphorus level: 48.5 µg/L. Chlorophyll-a: 24 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.1 ft | Not graded |
| Phosphorus | 48.5 µg/L | Poor |
| Chlorophyll-a (Algae) | 24 µg/L | Poor |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay 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 grade measures nutrients and algae, not lodging — cabins and rentals around Lone Lake are listed below.
Top-rated places to stay near Lone Lake
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 →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 22 ft |
| Average Depth | 13 ft |
| Surface Area | 112 acres |
| Shoreline Length | 2.3 mi |
| Littoral Zone | 93% |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Lone LakePublic
Fishing Lone Lake
DNR Fisheries Survey Summary
2 surveys on file from MN DNR Fisheries. Most recent: 1987-07-20 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | 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 Bass | 2.12 | 0.49 lb |
| CRP | 1.44 | 0.63 lb |
CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.
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
County Ranking
Ranked #11 of 12 lakes in Mahnomen County
Nearby Lakes With Higher Grades
Lone Lake holds Grade D. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Mahnomen County
Frequently asked questions about Lone Lake
What is the water quality grade for Lone Lake?
- Lone Lake in Mahnomen County, Minnesota has a water quality grade of D (Nutrient-rich). 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?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Lone Lake has a water quality grade of D (Nutrient-rich). Algae concentration (chlorophyll-a) is 24 µg/L. Always check local health department advisories before swimming.
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.
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.
Explore Lone Lake across LakeGrade
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Species activity outlook by water temperature and season
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High nutrients, frequent algae, reduced clarity
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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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated 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