Douglas County Lake Quality
Nebraska, 5 lakes — no lake here has enough monitoring data for a grade
Douglas County has 5 monitored 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. No lake in Douglas County has enough sampling behind it for an A–F grade yet. The 5 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 Douglas County
Planning a trip? Check special fishing regulations for Carter Lake — or check the official Nebraska fishing regulations.
All Lakes in Douglas County
5 lakes · 0 graded, 5 not rated0 graded lakes · 5 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| NRCarter LakeDouglas | NR | 3.2 ft | No recent samples | 76 µg/L | No recent samples | ✓ Public | |
| NRNewport Landing LakeDouglas | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRLonergan LakeDouglas | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRCandlewood ReservoirDouglas | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRRiverside LakesDouglas | 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.
Lake Match
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Other Counties in Nebraska
See how Douglas 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.