Box Elder County Lake Quality

Utah, 23 lakes, average grade D (Poor)

Box Elder County's 23 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. On average, Box Elder County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.

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. Nla Lake (A) is the cleanest in the county.

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Quick Answers for Box Elder County

Cleanest lakes in Box Elder County →Cleanest lakes in Utah →Safest swimming lakes in Utah →

Planning a trip? Check special fishing regulations for Nla Lake — or check the official Utah fishing regulations.

All Lakes in Box Elder County

Rank	Lake	Grade	Clarity	Phosphorus
1	Nla Lake	A	-	-
2	Great Salt Lake	B	10.5 ft	-
3	Nla Lake	B	6.5 ft	-
4	Mantua Reservoir N	C	3 ft	-
5	Willard Bay Reservoir	C	2.3 ft	-
6	Willard Bay Reservoir Emap	D	1.1 ft	-
7	Willard Pond West End	D	4.3 ft	-
8	Willard Pond East End	D	6.4 ft	-
9	Great Salt Lake Brb	D	-	70 µg/L
10	Mantua Reservoir S	D	2.6 ft	-
11	Willard West Lake	F	2.3 ft	-
12	Willard North Marina Lake	F	1.8 ft	-
13	Willard South Marina Lake	F	2.2 ft	-
14	Mantua Reservoir	F	3 ft	-
15	Gsl Breach Lake	F	-	236 µg/L