What is the cleanest lake in Indiana?

Lake George in Steuben County has the cleanest nutrient and algae readings in Indiana, with 14.5 feet of measured water clarity.

How are these rankings calculated?

Nutrients and algae, total phosphorus, nitrogen, chlorophyll-a and turbidity, are read against EPA National Lakes Assessment 2022 condition classes for that lake’s ecoregion. Water clarity (Secchi depth) is measured and shown separately. Lakes without enough recent samples are listed without a condition class rather than ranked low. Source data comes from the EPA Water Quality Portal.

Cleanest Lakes in Indiana

Lake George in Steuben County leads the rankings on measured clarity and nutrients and 14.5 ft of clarity. Below are the top 34 cleanest monitored lakes in Indiana, ranked on EPA nutrient and algae measurements.

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Lake George	Steuben	14.5 ft	22 µg/L	2 µg/L
2	Lake Pleasant	Steuben	-	23.5 µg/L	4 µg/L
3	Lake James	Steuben	-	21 µg/L	2 µg/L
4	Myers Lake	Marshall	-	23 µg/L	3.5 µg/L
5	Lake Maxinkuckee	Marshall	-	17.5 µg/L	3 µg/L
6	Big Long Lake	LaGrange	-	22 µg/L	4 µg/L
7	Long Lake	Porter	-	27 µg/L	8 µg/L
8	Pike Lake	Kosciusko	1.9 ft	60.5 µg/L	2 µg/L
9	Oswego Lake	Kosciusko	9.9 ft	33 µg/L	2.2 µg/L
10	Tippecanoe Lake	Kosciusko	8.5 ft	28.5 µg/L	5 µg/L
11	James Lake	Kosciusko	5.3 ft	30 µg/L	7 µg/L
12	Brookville Lake	Union	-	49 µg/L	5.4 µg/L
13	Loomis Lake	Porter	-	40 µg/L	11.5 µg/L
14	Martin Lake	LaGrange	-	22 µg/L	3 µg/L
15	Olin Lake	LaGrange	-	12.5 µg/L	2 µg/L
16	Oliver Lake	LaGrange	-	12.5 µg/L	3 µg/L
17	Cordry Lake	Brown	-	19.5 µg/L	1.5 µg/L
18	Papakeechie Lake	Kosciusko	-	29 µg/L	4 µg/L
19	Shriner Lake	Whitley	-	27 µg/L	3.5 µg/L
20	Cedar Lake	Whitley	-	25 µg/L	3 µg/L
21	Big Turkey Lake	Steuben	-	51 µg/L	19 µg/L
22	Lake of the Wood	Marshall	-	41 µg/L	17 µg/L
23	Holem Lake	Marshall	-	35 µg/L	10 µg/L
24	Colonial Pond	Fulton	-	49 µg/L	19 µg/L
25	Lake Louise	Porter	-	48 µg/L	20.5 µg/L
26	Cagles Mill Lake	Owen	-	106.5 µg/L	15.6 µg/L
27	Little Turkey Lake	LaGrange	-	40.5 µg/L	13 µg/L
28	Whippoorwill Lake	Morgan	-	37 µg/L	13 µg/L
29	Sand Lake	Noble	-	75 µg/L	7 µg/L
30	Starve Hollow Lake	Jackson	-	100 µg/L	-
31	Mississinewa Lake	Wabash	-	46 µg/L	35.5 µg/L
32	Lake Holiday	Lake	-	77.5 µg/L	42.5 µg/L
33	Skinner Lake	Noble	-	57 µg/L	43 µg/L
34	Waldron Lake	Noble	-	62 µg/L	36.2 µg/L

Ranked List

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