Yuma County Lake Quality
Colorado, 2 lakes — no lake here has enough monitoring data for a grade
Yuma County has 2 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 Yuma County has enough sampling behind it for an A–F grade yet. The 2 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.
Where to stay near Yuma County
Top-rated places to stay near Yuma County
Prices for Sep 4–6, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Yuma County?
Get lake water-quality report cards plus the best cabin & lodging deals near Yuma County — straight to your inbox. No spam, unsubscribe anytime.
Quick Answers for Yuma County
Planning a trip? Check special fishing regulations for Stalker Lake — or check the official Colorado fishing regulations.
All Lakes in Yuma County
2 lakes · 0 graded, 2 not rated0 graded lakes · 2 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| NRStalker LakeYuma | NR | 6 ft | 12 µg/L | 1.6 µg/L | No recent samples | ✓ Public | |
| NRBonny ReservoirYuma | 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
Which lake suits how you actually use one?
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 Yuma 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.