Douglas County Lake Quality
Colorado, 6 lakes — no lake here has enough monitoring data for a grade
Douglas County has 6 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 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 Douglas County
Planning a trip? Check special fishing regulations for Equestrian Park Pond — or check the official Colorado fishing regulations.
All Lakes in Douglas County
6 lakes · 0 graded, 6 not rated0 graded lakes · 6 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| NREquestrian Park PondDouglas | NR | 3 ft | 95 µg/L | 35.7 µg/L | No recent samples | Not recorded | |
| NRCheesman LakeDouglas | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRAurora-Rampart ReservoirDouglas | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRStrontia Springs ReservoirDouglas | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRPlatte Canyon ReservoirDouglas | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRRueter-Hess ReservoirDouglas | 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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Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of graded lakes that fit, with the water quality behind each one.
Other Counties in Colorado
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 and Québec), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.