Douglas County Lake Quality

Minnesota, 51 lakes, average grade B (Good)

Douglas County in Minnesota carries 51 graded lakes — one of the lake-richer counties in our dataset. Coverage that dense usually reflects active lake-association sampling alongside state-agency monitoring. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.

A meaningful share of Douglas's lakes break 50 feet of depth, which matters because deep lakes hold cooler water all summer and resist the resuspended-sediment problems that plague shallow basins. The county's best-graded lake is Latoka Lake (A).

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Quick Answers for Douglas County

Cleanest lakes in Douglas County →Cleanest lakes in Minnesota →Safest swimming lakes in Minnesota →

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

DNR Reports (144)

Minnesota DNR LakeFinder resources for lakes in Douglas County. Showing 12 most recent — browse all reports →

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Fisheries Lake Survey — Blackwell
Fisheries Lake Survey · MN DNR LakeFinder
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Fisheries Lake Survey — Winona
Fisheries Lake Survey · MN DNR LakeFinder
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Fisheries Lake Survey — Whiskey
Fisheries Lake Survey · MN DNR LakeFinder
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Fisheries Lake Survey — Victoria
Fisheries Lake Survey · MN DNR LakeFinder
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Fisheries Lake Survey — Vermont
Fisheries Lake Survey · MN DNR LakeFinder
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Fisheries Lake Survey — Turtle
Fisheries Lake Survey · MN DNR LakeFinder
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Fisheries Lake Survey — Stowe
Fisheries Lake Survey · MN DNR LakeFinder
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Fisheries Lake Survey — Stony
Fisheries Lake Survey · MN DNR LakeFinder
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Fisheries Lake Survey — Smith
Fisheries Lake Survey · MN DNR LakeFinder
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Fisheries Lake Survey — Red Rock
Fisheries Lake Survey · MN DNR LakeFinder
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Fisheries Lake Survey — Rachel
Fisheries Lake Survey · MN DNR LakeFinder
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Fisheries Lake Survey — Pocket
Fisheries Lake Survey · MN DNR LakeFinder

All Lakes in Douglas County

Rank	Lake	Grade	Clarity	Max Depth	Phosphorus
1	Latoka Lake	A	19 ft	108 ft	11 µg/L
2	Chippewa Lake	A	15.1 ft	95 ft	14 µg/L
3	Cowdry Lake	A	17 ft	52 ft	15 µg/L
4	Ida Lake	A	16.5 ft	106 ft	14 µg/L
5	Miltona Lake	A	18.8 ft	105 ft	17 µg/L
6	Mina Lake	A	16 ft	123 ft	-
7	Whiskey Lake	A	18.8 ft	46 ft	-
8	Moon Lake	A	20 ft	38 ft	11 µg/L
9	Stony Lake	A	15.7 ft	58 ft	-
10	Lottie Lake	A	16.1 ft	31 ft	15.5 µg/L
11	Moses Lake	A	16.2 ft	32 ft	-
12	Carlos Lake	A	17.2 ft	163 ft	13 µg/L
13	Stoney Lake	A	19 ft	58 ft	13 µg/L
14	North Union Lake	A	20.3 ft	42 ft	13.5 µg/L
15	Maple Lake	A	13.7 ft	78 ft	15 µg/L
16	Vermont Lake	A	14.3 ft	59 ft	13 µg/L
17	Darling Lake	A	14.7 ft	62 ft	19.5 µg/L
18	Andrew Lake	A	13.9 ft	83 ft	16.5 µg/L
19	Brophy Lake	A	14.4 ft	44 ft	19 µg/L
20	Burgen Lake	A	12 ft	43 ft	15 µg/L
21	South Oscar Lake	A	16.7 ft	-	20 µg/L
22	Louise Lake	A	14.5 ft	33 ft	15 µg/L
23	Blackwell Lake	A	11.5 ft	42 ft	15 µg/L
24	Lobster Lake	B	13 ft	65 ft	20 µg/L
25	Crooked Lake	B	14 ft	35 ft	20 µg/L
26	Turtle Lake	B	10.5 ft	21 ft	-
27	Mill Lake	B	11 ft	40 ft	24 µg/L
28	Mary Lake	B	9.8 ft	40 ft	19 µg/L
29	Irene Lake	B	10.7 ft	44 ft	22.5 µg/L
30	Le Homme Dieu Lake	B	13.1 ft	85 ft	21 µg/L
31	Victoria Lake	B	11.2 ft	60 ft	20 µg/L
32	Geneva Lake	B	14.1 ft	63 ft	22 µg/L
33	Nelson Lake	B	10.3 ft	52 ft	-
34	Alvin Lake	B	10.5 ft	163 ft	-
35	Rachel Lake	B	8.9 ft	65 ft	20 µg/L
36	Pocket Lake	B	9 ft	40 ft	24 µg/L
37	Jessie Lake	C	6.8 ft	26 ft	41 µg/L
38	Aaron Lake	C	7 ft	16 ft	-
39	Little Chippewa Lake	C	9 ft	24 ft	-
40	Henry Lake	C	5.2 ft	32 ft	22.5 µg/L
41	Red Rock Lake	C	3.6 ft	22 ft	53.5 µg/L
42	Wolf Lake	C	3.6 ft	42 ft	44 µg/L
43	Agnes Lake	C	4.9 ft	31 ft	37 µg/L
44	Freeborn Lake	C	4.6 ft	18 ft	35 µg/L
45	Smith Lake	D	3.6 ft	30 ft	60 µg/L
46	Stockhaven Lake	D	3.3 ft	-	-
47	Kensington Rearing Pond	D	1.3 ft	-	42 µg/L
48	Unnamed Lake	F	3.3 ft	-	-
49	Venus Lake	F	2.6 ft	-	-
50	Stowe Lake	F	2.6 ft	14 ft	106 µg/L
51	Winona Lake	F	2 ft	9 ft	93 µg/L

Source: EPA National Aquatic Resource Surveys, 2026.