Lyon County Lake Quality
Nevada, 6 lakes — no lake here has enough monitoring data for a grade
Lyon County holds 6 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. No lake in Lyon County has enough sampling behind it for an A–F grade yet. The 6 monitored lakes below carry whatever clarity, phosphorus, and chlorophyll-a measurements exist.
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.
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Quick Answers for Lyon County
Planning a trip? Check special fishing regulations for Lahontan Reservoir Narrows Inlet — or check the official Nevada fishing regulations.
All Lakes in Lyon County
6 lakes · 0 graded, 6 not rated0 graded lakes · 6 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| NRLahontan Reservoir Narrows InletLyon | NR | No recent samples | 350 µg/L | 7.1 µg/L | No recent samples | Not recorded | |
| NRBeaman LakesLyon | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRFort Churchill Cooling PondsLyon | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRArtesia LakeLyon | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRFernley Reservoir Number ThreeLyon | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRFernley Reservoir Number OneLyon | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in Nevada
See how Lyon County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.