Late afternoon sun over Slim Lake, scattering a bright path across wind-textured water

Mahnomen County Lake Quality

Minnesota, 83 lakes, measured by Minnesota PCA

Mahnomen County has 83 monitored lakes, enough that within-county variation matters as much as the county average. Some are deep glacial basins, others are shallow agricultural-watershed waters, and the measurements reflect that mix. 12 of those lakes carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. Most monitored lakes in Mahnomen County carry favourable nutrient and algae readings for Minnesota.

Most of the county's monitored lakes are shallow, under 50 feet, which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Bass Lake has the lowest nutrient and algae readings in the county.

Loading map…

Where to stay near Mahnomen County

Top-rated places to stay near Mahnomen County

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 trip to Mahnomen County?

Get lake water-quality updates plus the best cabin & lodging deals near Mahnomen County — straight to your inbox. No spam, unsubscribe anytime.

Quick Answers for Mahnomen County

Cleanest lakes in Mahnomen County →Cleanest lakes in Minnesota →Best swimming lakes in Minnesota →

Planning a trip? Check special fishing regulations for Bass Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Minnesota regulations index.

Fishing in Mahnomen County

Mahnomen County Fishing Guide

Fish species and the cleanest lakes in Mahnomen County

DNR Reports (36)

Minnesota DNR LakeFinder resources for lakes in Mahnomen County. browse all reports →

These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).

—
Fisheries Lake Survey — Tulaby
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — South Twin
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Snider
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Sargent
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Roy
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — North Twin
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Lone
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Little Elbow
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Island
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Bass
Fisheries Lake Survey · MN DNR LakeFinder
—
Aquatic Plant Report — Bass (0110)
Aquatic Plant Report · MN DNR LakeFinder
—
Fish Stocking History — Bass
Fish Stocking History · MN DNR LakeFinder
—
Public Water Access Sites — Bass
Public Water Access Sites · MN DNR LakeFinder
—
Aquatic Plant Report — Island (0107)
Aquatic Plant Report · MN DNR LakeFinder
—
Fish Stocking History — Island
Fish Stocking History · MN DNR LakeFinder
—
Public Water Access Sites — Island
Public Water Access Sites · MN DNR LakeFinder
—
Aquatic Plant Report — Little Elbow (1945)
Aquatic Plant Report · 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 — Lone
Public Water Access Sites · MN DNR LakeFinder
—
Fish Stocking History — North Twin
Fish Stocking History · MN DNR LakeFinder
—
Aquatic Plant Report — Roy (1694)
Aquatic Plant Report · MN DNR LakeFinder
—
Aquatic Plant Report — Roy (1947)
Aquatic Plant Report · MN DNR LakeFinder
—
Fish Stocking History — Roy
Fish Stocking History · MN DNR LakeFinder
—
Public Water Access Sites — Roy
Public Water Access Sites · MN DNR LakeFinder
—
Aquatic Plant Report — Sargent (1951)
Aquatic Plant Report · MN DNR LakeFinder
—
Public Water Access Sites — Sargent
Public Water Access Sites · MN DNR LakeFinder
—
Aquatic Plant Report — Snider (1948)
Aquatic Plant Report · MN DNR LakeFinder
—
Fish Stocking History — Snider
Fish Stocking History · MN DNR LakeFinder
—
Public Water Access Sites — Snider
Public Water Access Sites · MN DNR LakeFinder
—
Aquatic Plant Report — South Twin (1946)
Aquatic Plant Report · MN DNR LakeFinder
—
Fish Stocking History — South Twin
Fish Stocking History · MN DNR LakeFinder
—
Public Water Access Sites — South Twin
Public Water Access Sites · MN DNR LakeFinder
—
Aquatic Plant Report — Tulaby (1944)
Aquatic Plant Report · MN DNR LakeFinder
—
Fish Stocking History — Tulaby
Fish Stocking History · MN DNR LakeFinder
—
Public Water Access Sites — Tulaby
Public Water Access Sites · MN DNR LakeFinder

All Lakes in Mahnomen County

83 lakes · 12 ranked on readings, 71 without enough sampling12 lakes ranked on readings · 71 without enough sampling, hidden

Include not-rated lakes (71)

#	Lake	Clarity	Phosphorus	Algae	Trophic	Max Depth	Access
1	Bass LakeMahnomen	13.1 ft	10 µg/L	4.9 µg/L	No recent samples	26 ft	✓ Public
2	North Twin LakeMahnomen	8.5 ft	17 µg/L	5.9 µg/L	No recent samples	16 ft	Carry-in
3	South Twin LakeMahnomen	10.2 ft	13.5 µg/L	3.1 µg/L	No recent samples	29 ft	✓ Public
4	Little Elbow LakeMahnomen	6.9 ft	21 µg/L	6.2 µg/L	No recent samples	18 ft	Carry-in
5	Sargent LakeMahnomen	8.9 ft	16 µg/L	6.1 µg/L	No recent samples	15 ft	✓ Public
6	Norris LakeMahnomen	11.6 ft	15 µg/L	3.2 µg/L	No recent samples	No recent samples	Not recorded
7	Roy LakeMahnomen	6 ft	24 µg/L	13.6 µg/L	No recent samples	16 ft	✓ Public
8	Tulaby LakeMahnomen	7.8 ft	23 µg/L	10.2 µg/L	No recent samples	43 ft	✓ Public
9	Mccraney LakeMahnomen	12.1 ft	19 µg/L	10.3 µg/L	No recent samples	No recent samples	Carry-in
10	Snider LakeMahnomen	8.5 ft	21 µg/L	9.2 µg/L	No recent samples	29 ft	✓ Public
11	Lone LakeMahnomen	7.1 ft	48.5 µg/L	24 µg/L	No recent samples	22 ft	✓ Public
12	Island LakeMahnomen	4.5 ft	30 µg/L	34.3 µg/L	No recent samples	43 ft	✓ Public
	Big LakeMahnomen	2.1 ft	33 µg/L	32.3 µg/L	No recent samples	No recent samples	Carry-in
	Unnamed LakeMahnomen	3.3 ft	60 µg/L	2.9 µg/L	No recent samples	No recent samples	Carry-in
	Unnamed LakeMahnomen	3.3 ft	23 µg/L	3.8 µg/L	No recent samples	No recent samples	Not recorded
	Beaulieu LakeMahnomen	1.3 ft	90 µg/L	55.8 µg/L	No recent samples	No recent samples	Carry-in
	La Duc LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Ketchum LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	16.4 ft	Not recorded
	Frethem LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Allen LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Eastlund LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Little Vanose LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	27.5 ft	Not recorded
	Warren LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Rush LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Chief LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Aspinwall LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Vanose LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Circle LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	6.2 ft	Not recorded
	Edwin LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Church LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	Perch LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Gardner LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Burns Eighty LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Little Oak LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Fish LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Sandy LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Santwire LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Kersting LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Waubun LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Squirrel LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Paggen LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Sedivy LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Doucette LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Quallen LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Crooked LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Pine LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Hallot LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Puson LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	George LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Logger LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Jessie LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	McCraney LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	40 ft	Not recorded
	Wadena LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Little Elbow LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Sawmill LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Sucker LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Rooster LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Nest LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Jay LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Sawmill LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Buresh LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Hart LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Rice LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Lizzard LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Barney LakesMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Daigle LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Goodwin LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Flat LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Wolf LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Tamarack LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Lambert LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Washington LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Wakefield LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Swanson LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Long LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Snetsinger LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Skunk LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Annawaush LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Matt Ayers LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Simonson LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Sugar Bush LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Lower Long LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Long LakeMahnomen	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded

NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.

Lake Match

Which lake suits how you actually use one?

Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of lakes that fit, with the water quality behind each one.

Take the quiz →

Other Counties in Minnesota

43 lakes

52 lakes

178 lakes

397 lakes

469 lakes

320 lakes

Browse every Minnesota lake, or the full directory of lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..

Source: the Minnesota Pollution Control Agency and the Minnesota DNR. See data sources.