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

St. Louis County Lake Quality

Minnesota, 196 lakes, average grade B (Good)

St. Louis County has 196 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. 67 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.

The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Big Lake (A); the most-stressed is Elbow Lake (F).

Slim Lake, Washburn County, Wisconsin. Photo: LakeQuality — Original photograph

Loading map…

Where to stay near St. Louis County

Top-rated places to stay near St. Louis County

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 St. Louis County?

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

Quick Answers for St. Louis County

Cleanest lakes in St. Louis County →Cleanest lakes in Minnesota →Safest swimming lakes in Minnesota →

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

Fishing in St. Louis County

St. Louis County Fishing Guide

Fish species and best-graded lakes in St. Louis County

DNR Reports (40)

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

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

—
Fisheries Lake Survey — Wolf
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Wolf
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Wolf
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Whitewater
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Whiteface Reservoir
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — White
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — West Twin
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — War Club
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Bullet
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — West Two Rivers Reservoir
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Unnamed
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Erickson
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Toe
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Thompson
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Thirteen
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Susan
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Sunshine
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Sturgeon
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Strand
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — St. Mary's
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — St James Pit
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Sprite
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Spring
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — South Sturgeon
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Smith
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Sinneeg
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Silver
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Side
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Shoepack
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Shell
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Shagawa
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Schultz
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Schubert
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Sand Point
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Sand
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Wynne
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Unnamed
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Rose
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Quill
Fisheries Lake Survey · MN DNR LakeFinder
—
Fisheries Lake Survey — Unnamed
Fisheries Lake Survey · MN DNR LakeFinder

All Lakes in St. Louis County

196 lakes · 67 graded, 129 not rated67 graded lakes · 129 not rated, hidden

Include not-rated lakes (129)

#	Lake	Grade	Clarity	Phosphorus	Algae	Trophic	Max Depth	Access
1	ABig LakeSt. Louis	A	8.2 ft	14 µg/L	4.9 µg/L	No recent samples	22 ft	✓ Public
2	ASouth Sturgeon LakeSt. Louis	A	2.5 ft	20 µg/L	5.9 µg/L	No recent samples	43 ft	✓ Public
3	AColby LakeSt. Louis	A	3 ft	22 µg/L	3.2 µg/L	No recent samples	30 ft	✓ Public
4	AIsland LakeSt. Louis	A	14.5 ft	8.5 µg/L	2.8 µg/L	No recent samples	65 ft	✓ Public
5	ASilver LakeSt. Louis	A	19.3 ft	13.5 µg/L	2.9 µg/L	No recent samples	29 ft	✓ Public
6	APleasant LakeSt. Louis	A	10 ft	12.5 µg/L	4.4 µg/L	No recent samples	33 ft	✓ Public
7	AEast Twin LakeSt. Louis	A	2.8 ft	117 µg/L	6.9 µg/L	No recent samples	No recent samples	Carry-in
8	APerch LakeSt. Louis	A	13.5 ft	11 µg/L	5.1 µg/L	No recent samples	30 ft	✓ Public
9	ASide LakeSt. Louis	A	11.5 ft	11.5 µg/L	4 µg/L	No recent samples	32 ft	✓ Public
10	APine LakeSt. Louis	A	7.5 ft	15.5 µg/L	3.9 µg/L	No recent samples	14 ft	✓ Public
11	ACedar Island LakeSt. Louis	A	3.8 ft	20.5 µg/L	3.6 µg/L	No recent samples	No recent samples	✓ Public
12	ASturgeon LakeSt. Louis	A	13.8 ft	12.5 µg/L	2.7 µg/L	No recent samples	79.8 ft	✓ Public
13	ARose LakeSt. Louis	A	No recent samples	17.5 µg/L	3 µg/L	No recent samples	31 ft	Carry-in
14	ABurntside LakeSt. Louis	A	16 ft	7 µg/L	2 µg/L	No recent samples	126 ft	✓ Public
15	ADodo LakeSt. Louis	A	12.8 ft	9.1 µg/L	1.9 µg/L	No recent samples	53 ft	Carry-in
16	ASt. Marys LakeSt. Louis	A	13.1 ft	7.5 µg/L	2.1 µg/L	No recent samples	44 ft	Carry-in
17	ASabin LakeSt. Louis	A	2.1 ft	19.5 µg/L	4.1 µg/L	No recent samples	52 ft	✓ Public
18	ABear Island LakeSt. Louis	A	7 ft	15 µg/L	6.4 µg/L	No recent samples	62 ft	✓ Public
19	ANichols LakeSt. Louis	A	5.1 ft	20.5 µg/L	6.4 µg/L	No recent samples	31 ft	✓ Public
20	AEly LakeSt. Louis	A	17.1 ft	7 µg/L	2.1 µg/L	No recent samples	70 ft	✓ Public
21	AMurphy LakeSt. Louis	A	6.4 ft	18 µg/L	6.1 µg/L	No recent samples	24 ft	✓ Public
22	AWynne LakeSt. Louis	A	7.3 ft	15.5 µg/L	2.5 µg/L	No recent samples	52 ft	✓ Public
23	ACadotte LakeSt. Louis	A	10.2 ft	13 µg/L	4.3 µg/L	No recent samples	18 ft	✓ Public
24	AFenske LakeSt. Louis	A	11.5 ft	11 µg/L	1.6 µg/L	No recent samples	43 ft	✓ Public
25	AWhitewater LakeSt. Louis	A	14 ft	14.5 µg/L	1.8 µg/L	No recent samples	73 ft	✓ Public
26	ABear Head LakeSt. Louis	A	11 ft	19.5 µg/L	3.6 µg/L	No recent samples	46 ft	✓ Public
27	AEd Shave LakeSt. Louis	A	11.5 ft	10 µg/L	4.2 µg/L	No recent samples	17 ft	✓ Public
28	BWest Twin LakeSt. Louis	B	6.2 ft	18.5 µg/L	7.1 µg/L	No recent samples	18 ft	✓ Public
29	BPeary LakeSt. Louis	B	6.7 ft	20.2 µg/L	No recent samples	No recent samples	15 ft	Carry-in
30	BEagles Nest LakeSt. Louis	B	15.5 ft	7 µg/L	1.1 µg/L	No recent samples	49 ft	✓ Public
31	BMukooda LakeSt. Louis	B	16.6 ft	17 µg/L	No recent samples	No recent samples	78 ft	Carry-in
32	BSandy LakeSt. Louis	B	No recent samples	20.5 µg/L	No recent samples	No recent samples	No recent samples	Carry-in
33	BBrown LakeSt. Louis	B	8.5 ft	17.1 µg/L	No recent samples	No recent samples	27 ft	Carry-in
34	BLittle Trout LakeSt. Louis	B	20.3 ft	10.2 µg/L	No recent samples	No recent samples	95 ft	Carry-in
35	BElliot LakeSt. Louis	B	6.2 ft	20.5 µg/L	7.4 µg/L	No recent samples	13 ft	✓ Public
36	BRyan LakeSt. Louis	B	9.2 ft	17.2 µg/L	No recent samples	No recent samples	13 ft	Carry-in
37	BShoepack LakeSt. Louis	B	4.6 ft	19.8 µg/L	No recent samples	No recent samples	24 ft	Carry-in
38	BCruiser LakeSt. Louis	B	25.4 ft	5.8 µg/L	No recent samples	No recent samples	91 ft	Carry-in
39	BLocator LakeSt. Louis	B	8.5 ft	17.1 µg/L	No recent samples	No recent samples	52 ft	Carry-in
40	BBig Rice LakeSt. Louis	B	No recent samples	24 µg/L	No recent samples	No recent samples	5 ft	✓ Public
41	BLittle Sandy LakeSt. Louis	B	No recent samples	19 µg/L	No recent samples	No recent samples	No recent samples	Carry-in
42	CBirch LakeSt. Louis	C	3.9 ft	21.5 µg/L	7.5 µg/L	No recent samples	25 ft	✓ Public
43	COne Pine LakeSt. Louis	C	4.5 ft	27 µg/L	8.6 µg/L	No recent samples	13 ft	✓ Public
44	CEast Twin LakeSt. Louis	C	4.9 ft	21 µg/L	8.9 µg/L	No recent samples	22 ft	✓ Public
45	CEverett LakeSt. Louis	C	7 ft	16 µg/L	8 µg/L	No recent samples	15 ft	✓ Public
46	CBlueberry LakeSt. Louis	C	2 ft	49 µg/L	4.7 µg/L	No recent samples	6 ft	✓ Public
47	CLost LakeSt. Louis	C	5.8 ft	110 µg/L	6.7 µg/L	No recent samples	No recent samples	Carry-in
48	CCarey LakeSt. Louis	C	4.9 ft	30 µg/L	10.1 µg/L	No recent samples	13.5 ft	✓ Public
49	CJohnson LakeSt. Louis	C	3 ft	33 µg/L	9.8 µg/L	No recent samples	18 ft	✓ Public
50	CSpirit LakeSt. Louis	C	1.3 ft	65 µg/L	1.8 µg/L	No recent samples	No recent samples	✓ Public
51	CLittle Sturgeon LakeSt. Louis	C	4.8 ft	21 µg/L	9.6 µg/L	No recent samples	22 ft	✓ Public
52	CSimian LakeSt. Louis	C	3.9 ft	33 µg/L	5.5 µg/L	No recent samples	No recent samples	Carry-in
53	CJoe Martin LakeSt. Louis	C	14.5 ft	35.5 µg/L	2.3 µg/L	No recent samples	77 ft	Carry-in
54	CHeikkilla LakeSt. Louis	C	5 ft	24 µg/L	13.6 µg/L	No recent samples	7 ft	Carry-in
55	CLeora LakeSt. Louis	C	7 ft	41 µg/L	5.8 µg/L	No recent samples	35 ft	✓ Public
56	CW Two Rivers ReservoirSt. Louis	C	6.4 ft	29 µg/L	5.5 µg/L	No recent samples	27 ft	✓ Public
57	CMeander LakeSt. Louis	C	13 ft	39 µg/L	3.2 µg/L	No recent samples	25 ft	✓ Public
58	CStone LakeSt. Louis	C	No recent samples	26 µg/L	No recent samples	No recent samples	No recent samples	✓ Public
59	CAsh LakeSt. Louis	C	5.5 ft	39 µg/L	11.1 µg/L	No recent samples	25 ft	✓ Public
60	CLittle Rice LakeSt. Louis	C	No recent samples	34 µg/L	No recent samples	No recent samples	No recent samples	✓ Public
61	CUpper Estuary LakeSt. Louis	C	1.9 ft	49.5 µg/L	1.7 µg/L	No recent samples	55 ft	✓ Public
62	CWinkle LakeSt. Louis	C	No recent samples	26.5 µg/L	4.7 µg/L	No recent samples	No recent samples	✓ Public
63	CBreda LakeSt. Louis	C	No recent samples	33 µg/L	No recent samples	No recent samples	No recent samples	✓ Public
64	DStrand LakeSt. Louis	D	3.5 ft	44 µg/L	10.9 µg/L	No recent samples	16 ft	✓ Public
65	DBlackduck LakeSt. Louis	D	6.8 ft	43 µg/L	23.3 µg/L	No recent samples	30 ft	✓ Public
66	DMashkenode LakeSt. Louis	D	4.2 ft	50.5 µg/L	22.3 µg/L	No recent samples	14 ft	✓ Public
67	FElbow LakeSt. Louis	F	3.6 ft	52.5 µg/L	31.6 µg/L	No recent samples	22 ft	Carry-in
	NRKabetogama LakeSt. Louis	NR	4.4 ft	No recent samples	No recent samples	No recent samples	80 ft	✓ Public
	NRRainy LakeSt. Louis	NR	8.4 ft	No recent samples	No recent samples	No recent samples	161 ft	✓ Public
	NRLittle Shoepack LakeSt. Louis	NR	6.2 ft	No recent samples	No recent samples	No recent samples	25 ft	Carry-in
	NRNamakan LakeSt. Louis	NR	11.5 ft	No recent samples	No recent samples	No recent samples	150 ft	Carry-in
	NRKabetogama LakeSt. Louis	NR	4.9 ft	No recent samples	No recent samples	No recent samples	80 ft	✓ Public
	NRKabetogama LakeSt. Louis	NR	4.8 ft	No recent samples	No recent samples	No recent samples	80 ft	✓ Public
	NRSand Point LakeSt. Louis	NR	6.6 ft	No recent samples	No recent samples	No recent samples	184 ft	Carry-in
	NROslo LakeSt. Louis	NR	9.2 ft	No recent samples	No recent samples	No recent samples	36 ft	Carry-in
	NRJorgens LakeSt. Louis	NR	7.2 ft	No recent samples	No recent samples	No recent samples	21 ft	Carry-in
	NRAgnes LakeSt. Louis	NR	5.2 ft	No recent samples	No recent samples	No recent samples	18 ft	Carry-in
	NRAgnes LakeSt. Louis	NR	11 ft	No recent samples	No recent samples	No recent samples	30 ft	Carry-in
	NRQuarter Line LakeSt. Louis	NR	4.6 ft	No recent samples	No recent samples	No recent samples	22 ft	Carry-in
	NRQuill LakeSt. Louis	NR	10.7 ft	No recent samples	1.8 µg/L	No recent samples	46 ft	Carry-in
	NRLoiten LakeSt. Louis	NR	11.5 ft	No recent samples	No recent samples	No recent samples	49 ft	Carry-in
	NRWar Club LakeSt. Louis	NR	7.9 ft	No recent samples	No recent samples	No recent samples	40 ft	Carry-in
	NRO'Leary LakeSt. Louis	NR	10.7 ft	No recent samples	No recent samples	No recent samples	52 ft	Carry-in
	NRCrane LakeSt. Louis	NR	6.3 ft	No recent samples	No recent samples	No recent samples	80 ft	✓ Public
	NRBeast LakeSt. Louis	NR	10.2 ft	No recent samples	No recent samples	No recent samples	66 ft	Carry-in
	NRPelican LakeSt. Louis	NR	7.5 ft	No recent samples	No recent samples	No recent samples	38 ft	✓ Public
	NRPike LakeSt. Louis	NR	18 ft	No recent samples	No recent samples	No recent samples	60 ft	✓ Public
	NRLong LakeSt. Louis	NR	12.5 ft	No recent samples	No recent samples	No recent samples	33 ft	Carry-in
	NRUnnamed LakeSt. Louis	NR	11.5 ft	No recent samples	No recent samples	No recent samples	No recent samples	Carry-in
	NRUnnamed LakeSt. Louis	NR	4.8 ft	27 µg/L	8.4 µg/L	No recent samples	7 ft	Carry-in
	NRSunshine LakeSt. Louis	NR	20 ft	No recent samples	No recent samples	No recent samples	37 ft	Carry-in
	NREast Vermilion LakeSt. Louis	NR	6.5 ft	No recent samples	No recent samples	No recent samples	76 ft	✓ Public
	NRTwin LakeSt. Louis	NR	3.6 ft	13 µg/L	2.5 µg/L	No recent samples	No recent samples	Not recorded
	NRClear LakeSt. Louis	NR	11 ft	No recent samples	No recent samples	No recent samples	24 ft	✓ Public
	NRPrairie LakeSt. Louis	NR	5 ft	No recent samples	No recent samples	No recent samples	47 ft	✓ Public
	NRBear LakeSt. Louis	NR	3.3 ft	31 µg/L	12.6 µg/L	No recent samples	No recent samples	Not recorded
	NRSand LakeSt. Louis	NR	9 ft	No recent samples	No recent samples	No recent samples	15 ft	Carry-in
	NRWest Vermilion LakeSt. Louis	NR	8 ft	No recent samples	No recent samples	No recent samples	76 ft	✓ Public
	NRShell LakeSt. Louis	NR	9 ft	No recent samples	No recent samples	No recent samples	15 ft	Carry-in
	NRGreen LakeSt. Louis	NR	9 ft	No recent samples	No recent samples	No recent samples	20 ft	Carry-in
	NRBass LakeSt. Louis	NR	4.2 ft	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRThompson LakeSt. Louis	NR	3 ft	No recent samples	No recent samples	No recent samples	9 ft	Carry-in
	NRFairy LakeSt. Louis	NR	7 ft	No recent samples	No recent samples	No recent samples	19 ft	Carry-in
	NRGeorge LakeSt. Louis	NR	14.3 ft	10 µg/L	3.7 µg/L	No recent samples	18 ft	✓ Public
	NRCaribou LakeSt. Louis	NR	10.5 ft	No recent samples	No recent samples	No recent samples	21 ft	✓ Public
	NRFourteen LakeSt. Louis	NR	10 ft	No recent samples	No recent samples	No recent samples	14.5 ft	Carry-in
	NRBriar LakeSt. Louis	NR	6 ft	No recent samples	No recent samples	No recent samples	21 ft	✓ Public
	NRFinberg LakeSt. Louis	NR	6 ft	No recent samples	No recent samples	No recent samples	18 ft	Carry-in
	NRBassett LakeSt. Louis	NR	8 ft	No recent samples	No recent samples	No recent samples	21 ft	✓ Public
	NRMajestic LakeSt. Louis	NR	15.3 ft	No recent samples	No recent samples	No recent samples	51 ft	Carry-in
	NREast Twin LakeSt. Louis	NR	13.1 ft	7 µg/L	2.7 µg/L	No recent samples	51 ft	✓ Public
	NRSunday LakeSt. Louis	NR	6.3 ft	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRElbow LakeSt. Louis	NR	7 ft	No recent samples	No recent samples	No recent samples	60 ft	✓ Public
	NRWolf LakeSt. Louis	NR	9 ft	20 µg/L	5.4 µg/L	No recent samples	28 ft	✓ Public
	NRWolf LakeSt. Louis	NR	2 ft	No recent samples	No recent samples	No recent samples	12 ft	✓ Public
	NRWolf LakeSt. Louis	NR	6.6 ft	20 µg/L	6.3 µg/L	No recent samples	10 ft	✓ Public
	NRSchultz LakeSt. Louis	NR	15.5 ft	No recent samples	No recent samples	No recent samples	48 ft	Carry-in
	NRPerch LakeSt. Louis	NR	6.6 ft	21 µg/L	11.5 µg/L	No recent samples	13 ft	✓ Public
	NRSmith LakeSt. Louis	NR	15 ft	No recent samples	No recent samples	No recent samples	51 ft	Carry-in
	NRSide LakeSt. Louis	NR	5.2 ft	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRThirteen LakeSt. Louis	NR	14 ft	No recent samples	No recent samples	No recent samples	17 ft	Carry-in
	NRLittle Armstrong LakeSt. Louis	NR	15.5 ft	No recent samples	No recent samples	No recent samples	26 ft	Carry-in
	NRLittle Long LakeSt. Louis	NR	21 ft	No recent samples	No recent samples	No recent samples	45 ft	✓ Public
	NRFlowage LakeSt. Louis	NR	8.5 ft	No recent samples	No recent samples	No recent samples	15 ft	✓ Public
	NRWhite LakeSt. Louis	NR	11.5 ft	10 µg/L	5.8 µg/L	No recent samples	29 ft	✓ Public
	NRBoot LakeSt. Louis	NR	5.5 ft	No recent samples	No recent samples	No recent samples	27 ft	Carry-in
	NRSchubert LakeSt. Louis	NR	6.5 ft	No recent samples	No recent samples	No recent samples	24 ft	Carry-in
	NRWhiteface ReservoirSt. Louis	NR	3 ft	No recent samples	No recent samples	No recent samples	35 ft	✓ Public
	NRVermilion LakeSt. Louis	NR	3.5 ft	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRJacobs LakeSt. Louis	NR	4.5 ft	No recent samples	No recent samples	No recent samples	9 ft	✓ Public
	NRArmstrong LakeSt. Louis	NR	16.2 ft	No recent samples	No recent samples	No recent samples	34 ft	✓ Public
	NRLoon LakeSt. Louis	NR	6.6 ft	No recent samples	2.8 µg/L	No recent samples	No recent samples	Not recorded
	NRAlden LakeSt. Louis	NR	5 ft	No recent samples	No recent samples	No recent samples	29 ft	Carry-in
	NRLost LakeSt. Louis	NR	23 ft	No recent samples	No recent samples	No recent samples	44 ft	✓ Public
	NRSt James Pit LakeSt. Louis	NR	47.6 ft	No recent samples	2 µg/L	No recent samples	381 ft	✓ Public
	NRMajestic LakeSt. Louis	NR	17.1 ft	No recent samples	No recent samples	No recent samples	51 ft	Carry-in
	NRDeep LakeSt. Louis	NR	17.2 ft	12 µg/L	2.5 µg/L	No recent samples	50 ft	✓ Public
	NRSpring LakeSt. Louis	NR	9.5 ft	No recent samples	No recent samples	No recent samples	25 ft	✓ Public
	NRLower Comstock LakeSt. Louis	NR	4.5 ft	No recent samples	No recent samples	No recent samples	30 ft	✓ Public
	NRSusan LakeSt. Louis	NR	3.6 ft	32 µg/L	10.8 µg/L	No recent samples	10 ft	✓ Public
	NRSt Mary'S LakeSt. Louis	NR	15 ft	No recent samples	No recent samples	No recent samples	44 ft	Carry-in
	NRAerie LakeSt. Louis	NR	9.5 ft	No recent samples	No recent samples	No recent samples	37 ft	Carry-in
	NRShagawa LakeSt. Louis	NR	8.9 ft	13 µg/L	5.4 µg/L	No recent samples	48 ft	✓ Public
	NRClark LakeSt. Louis	NR	No recent samples	No recent samples	No recent samples	No recent samples	44 ft	Carry-in
	NRPequaywan LakeSt. Louis	NR	8.5 ft	No recent samples	No recent samples	No recent samples	33 ft	✓ Public
	NRCrab LakeSt. Louis	NR	No recent samples	No recent samples	No recent samples	No recent samples	57 ft	Carry-in
	NRGun LakeSt. Louis	NR	9 ft	No recent samples	No recent samples	No recent samples	57 ft	Carry-in
	NRWarren LakeSt. Louis	NR	6.7 ft	No recent samples	No recent samples	No recent samples	No recent samples	Carry-in
	NRLac la Croix LakeSt. Louis	NR	8 ft	No recent samples	No recent samples	No recent samples	168 ft	Carry-in
	NRLac la Croix LakeSt. Louis	NR	2.5 ft	No recent samples	No recent samples	No recent samples	30 ft	Carry-in
	NRSprite LakeSt. Louis	NR	No recent samples	No recent samples	No recent samples	No recent samples	16 ft	Carry-in
	NROtto LakeSt. Louis	NR	6 ft	No recent samples	No recent samples	No recent samples	27 ft	✓ Public
	NRLower Pauness LakeSt. Louis	NR	5.7 ft	No recent samples	No recent samples	No recent samples	36 ft	Carry-in
	NRAce LakeSt. Louis	NR	8 ft	No recent samples	No recent samples	No recent samples	8 ft	Carry-in
	NRWagosh LakeSt. Louis	NR	8 ft	No recent samples	No recent samples	No recent samples	10 ft	Carry-in
	NRAerie LakeSt. Louis	NR	11.5 ft	No recent samples	No recent samples	No recent samples	37 ft	Carry-in
	NRBear Trap LakeSt. Louis	NR	8.2 ft	No recent samples	No recent samples	No recent samples	38 ft	Carry-in
	NRLittle Vermilion LakeSt. Louis	NR	10 ft	No recent samples	No recent samples	No recent samples	17 ft	Carry-in
	NRAnne LakeSt. Louis	NR	14.4 ft	9 µg/L	3.6 µg/L	No recent samples	27 ft	✓ Public
	NRBog LakeSt. Louis	NR	3.3 ft	14 µg/L	1.1 µg/L	No recent samples	No recent samples	✓ Public
	NRToe LakeSt. Louis	NR	13.5 ft	No recent samples	No recent samples	No recent samples	57 ft	Carry-in
	NRNibin LakeSt. Louis	NR	5.6 ft	No recent samples	No recent samples	No recent samples	40 ft	Carry-in
	NREsquagama LakeSt. Louis	NR	3.5 ft	No recent samples	No recent samples	No recent samples	90 ft	✓ Public
	NRThirty-Six LakeSt. Louis	NR	3 ft	22 µg/L	7.9 µg/L	No recent samples	No recent samples	✓ Public
	NRBeartrack LakeSt. Louis	NR	11 ft	No recent samples	No recent samples	No recent samples	55 ft	Carry-in
	NREugene LakeSt. Louis	NR	11.5 ft	No recent samples	4.4 µg/L	No recent samples	64 ft	Carry-in
	NRTrease LakeSt. Louis	NR	4.7 ft	29 µg/L	8.2 µg/L	No recent samples	No recent samples	Carry-in
	NROyster LakeSt. Louis	NR	6.6 ft	No recent samples	No recent samples	No recent samples	130 ft	Carry-in
	NRFinger LakeSt. Louis	NR	8.5 ft	8 µg/L	4.9 µg/L	No recent samples	60 ft	Carry-in
	NRLow LakeSt. Louis	NR	8.7 ft	13.5 µg/L	3.8 µg/L	No recent samples	40 ft	✓ Public
	NRSuperior LakeSt. Louis	NR	No recent samples	10 µg/L	No recent samples	No recent samples	No recent samples	✓ Public
	NRBan LakeSt. Louis	NR	6 ft	No recent samples	No recent samples	No recent samples	10 ft	✓ Public
	NRMarkham LakeSt. Louis	NR	3 ft	No recent samples	No recent samples	No recent samples	29 ft	Carry-in
	NRNorth LakeSt. Louis	NR	12 ft	No recent samples	No recent samples	No recent samples	No recent samples	Carry-in
	NRSinneeg LakeSt. Louis	NR	11 ft	No recent samples	No recent samples	No recent samples	32 ft	Carry-in
	NRFourth LakeSt. Louis	NR	1.5 ft	No recent samples	No recent samples	No recent samples	20 ft	Carry-in
	NRDark LakeSt. Louis	NR	3.8 ft	No recent samples	No recent samples	No recent samples	31 ft	✓ Public
	NRKauppi LakeSt. Louis	NR	3 ft	No recent samples	No recent samples	No recent samples	No recent samples	Carry-in
	NRJamer LakeSt. Louis	NR	3 ft	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRIron Chief Complex LakeSt. Louis	NR	24.5 ft	No recent samples	No recent samples	No recent samples	262.1 ft	✓ Public
	NRGilbert Pit LakeSt. Louis	NR	11.5 ft	No recent samples	No recent samples	No recent samples	443 ft	✓ Public
	NRDuluth LakeSt. Louis	NR	2 ft	39 µg/L	2.6 µg/L	No recent samples	No recent samples	✓ Public
	NRNorth Hegman LakeSt. Louis	NR	6.5 ft	No recent samples	No recent samples	No recent samples	30 ft	Carry-in
	NRIsland Lake ReservoirSt. Louis	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRFoss LakeSt. Louis	NR	4 ft	No recent samples	No recent samples	No recent samples	6 ft	Carry-in
	NRIron LakeSt. Louis	NR	5 ft	No recent samples	No recent samples	No recent samples	64 ft	Carry-in
	NRMerrill LakeSt. Louis	NR	16 ft	No recent samples	No recent samples	No recent samples	No recent samples	Carry-in
	NRMiner'S Pit West LakeSt. Louis	NR	23.1 ft	4.5 µg/L	1.1 µg/L	No recent samples	140 ft	✓ Public
	NRSouth Hegman LakeSt. Louis	NR	8.5 ft	No recent samples	No recent samples	No recent samples	55 ft	✓ Public
	NRAnchor LakeSt. Louis	NR	2.4 ft	No recent samples	No recent samples	No recent samples	54 ft	Carry-in
	NRGe-Be-on-Equat LakeSt. Louis	NR	10 ft	No recent samples	No recent samples	No recent samples	55 ft	Carry-in
	NRNina Moose LakeSt. Louis	NR	2 ft	No recent samples	No recent samples	No recent samples	6 ft	Carry-in
	NRRamshead LakeSt. Louis	NR	No recent samples	No recent samples	No recent samples	No recent samples	10 ft	Carry-in
	NRRocky LakeSt. Louis	NR	7 ft	No recent samples	No recent samples	No recent samples	40 ft	Carry-in
	NRMudro LakeSt. Louis	NR	No recent samples	No recent samples	No recent samples	No recent samples	76 ft	Carry-in
	NRSchisler LakeSt. Louis	NR	No recent samples	32 µg/L	8.3 µg/L	No recent samples	19 ft	Carry-in

NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.

Lake Match

Which lake suits how you actually use one?

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

Take the quiz →

Other Counties in Minnesota

Clay County

2 lakes · Avg grade A

Morrison County

16 lakes · Avg grade A

Hubbard County

76 lakes · Avg grade A

Cass County

130 lakes · Avg grade A

Cook County

139 lakes · Avg grade A

Crow Wing County

121 lakes · Avg grade A

See how St. Louis County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 49 states and 2 Canadian provinces.

Source: EPA National Aquatic Resource Surveys, 2026.