Custer County Lake Quality
Colorado, 2 lakes, average grade D (Poor)
Custer County has 2 graded 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. On average, Custer 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. Deweese Reservoir (D) is the cleanest in the county.
Quick Answers for Custer County
Planning a trip? Check special fishing regulations for Deweese Reservoir — or check the official Colorado fishing regulations.
All Lakes in Custer County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Deweese Reservoir | D | 5.2 ft | - |
| 2 | Lake Isabel | D | 5.9 ft | - |
Other Counties in Colorado
See how Custer County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 12 states.
Where to stay near Custer County
Top-rated places to stay near Custer County
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 Custer County?
Get lake water-quality report cards plus the best cabin & lodging deals near Custer County — straight to your inbox. No spam, unsubscribe anytime.
Source: EPA National Aquatic Resource Surveys, 2026.