Teton County Lake Quality

Wyoming, 17 lakes, average grade B (Good)

Teton County's 17 graded lakes fall in the moderate-density bracket for {{stateName}}. The county-level average smooths over real differences — a single agricultural watershed near the southwest corner can pull the average down even if the rest of the county runs clean. With an average grade of B, Teton County sits comfortably above the {{stateName}} median.

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. West Thumb Lake (A) is the cleanest in the county.

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Quick Answers for Teton County

Cleanest lakes in Teton County →Cleanest lakes in Wyoming →Safest swimming lakes in Wyoming →

Planning a trip? Check special fishing regulations for West Thumb Lake — or check the official Wyoming fishing regulations.

All Lakes in Teton County

Rank	Lake	Grade	Clarity	Phosphorus
1	West Thumb Lake	A	31.2 ft	-
2	Yellowstone Lake	A	28.7 ft	-
3	Yellowstone Lake	A	26.2 ft	-
4	Yellowstone Lake @ East Side of Stevenson Island	A	27.1 ft	-
5	Yellowstone Lake	A	25.4 ft	-
6	Yellowstone Lake	A	25.4 ft	-
7	Inlet Arizona Island Lake	A	17.5 ft	-
8	Leeks Marina North Lake	A	16.4 ft	-
9	Moran Bay Lake	A	18.3 ft	-
10	Colter South Dock Lake	B	12.2 ft	-
11	Nla Lake	B	26.9 ft	42000 µg/L
12	Nla Lake	B	38.1 ft	4501.1 µg/L
13	Colter North Dock Lake	C	9.8 ft	-
14	Leeks Marina Lake	D	3.4 ft	-
15	Nla Lake	F	4.9 ft	34000 µg/L