Natrona County Lake Quality
Wyoming, 14 lakes, average grade C (Fair)
Only 14 lakes in Natrona 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. Natrona County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
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. Pathfinder Reservoir Lacustrine Pelagic (B) is the cleanest in the county.
Quick Answers for Natrona County
Planning a trip? Check special fishing regulations for Pathfinder Reservoir Lacustrine Pelagic — or check the official Wyoming fishing regulations.
All Lakes in Natrona County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Pathfinder Reservoir Lacustrine Pelagic | B | 10.7 ft | 20 µg/L |
| 2 | Alcova Reservoir Transitional Pelagic | B | 11.3 ft | 20 µg/L |
| 3 | Pathfinder Reservoir Transitional Pelagic | B | 11.1 ft | 20 µg/L |
| 4 | Alcova Reservoir Lacustrine Pelagic | B | 12.8 ft | 20 µg/L |
| 5 | Pathfinder Reservoir Transitional Littoral | B | 7.7 ft | 15 µg/L |
| 6 | Alcova Reservoir Transitional Littoral | B | 5.2 ft | 15 µg/L |
| 7 | Pathfinder Reservoir Lacustrine Littoral | B | 7.8 ft | 20 µg/L |
| 8 | Alcova Reservoir Lacustrine Littoral | B | 4.3 ft | 15 µg/L |
| 9 | Nla Lake | C | 8.2 ft | 44000 µg/L |
| 10 | Pathfinder Reservoir Riverine Pelagic | C | 4.4 ft | 25 µg/L |
| 11 | Nla Lake | C | 5.1 ft | 42.1 µg/L |
| 12 | Alcova Reservoir Riverine Littoral | C | 3.4 ft | 35 µg/L |
| 13 | Alcova Reservoir Riverine Pelagic | C | 5.8 ft | 30 µg/L |
| 14 | Pathfinder Reservoir Riverine Littoral | C | 3.7 ft | 30 µg/L |
Other Counties in Wyoming
See how Natrona County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 34 states.
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Source: EPA National Aquatic Resource Surveys, 2026.