Humboldt County Lake Quality

Nevada, 9 lakes, average grade D (Poor)

Humboldt County has 9 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. The county-wide average grade is D — water quality issues are persistent across most of the monitored basins. 0 lakes fall into the F bracket outright.

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. Onion Valley Reservoir @ Dam (B) is the cleanest in the county.

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Quick Answers for Humboldt County

Cleanest lakes in Humboldt County →Cleanest lakes in Nevada →Safest swimming lakes in Nevada →

Planning a trip? Check special fishing regulations for Onion Valley Reservoir @ Dam — or check the official Nevada fishing regulations.

All Lakes in Humboldt County

Rank	Lake	Grade	Clarity	Phosphorus
1	Onion Valley Reservoir @ Dam	B	-	50 µg/L
2	Bilk Creek Reservoir	C	-	160 µg/L
3	Nla Lake	C	10.8 ft	88000 µg/L
4	Nla Lake	C	0.7 ft	501000 µg/L
5	Chimney Reservoir West Lobe	C	-	490 µg/L
6	Nla Lake	D	4.6 ft	137000 µg/L
7	Chimney Reservoir West Lobe North	D	-	480 µg/L
8	Chimney Reservoir East Lobe	D	-	590 µg/L
9	Knott Creek Reservoir	D	-	145 µg/L