Alpine County Lake Quality
California, 1 lake, average grade D (Nutrient-rich)
Only 1 lakes in Alpine County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. On average, Alpine 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. Red Lake (D) is the cleanest in the county.
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Quick Answers for Alpine County
Planning a trip? Check special fishing regulations for Red Lake — or check the official California fishing regulations.
All Lakes in Alpine County
1 lake1 graded lake
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | DRed LakeAlpine | D | No recent samples | 61.5 µg/L | No recent samples | No recent samples | Not recorded |
Lake Match
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Other Counties in California
See how Alpine County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 49 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.