Lake Nighthorse is a cold, clear oligotrophic lake in La Plata County, Colorado. Water quality is graded A based on 1 sampling years through 2023. Compared to the 3 other monitored lakes in La Plata County, Lake Nighthorse ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Colorado DNR, last sampled 2023-09-13. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 18.7 ft down. Trophic State Index: 35.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 18.7 ft | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 35 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lake Nighthorse
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Fishing Lake Nighthorse
Location
County Ranking
Ranked #1 of 4 lakes in La Plata County
Nearby Lakes in La Plata County
Explore Lake Nighthorse across LakeGrade
More Colorado Lake Rankings
Other Grade A Lakes in Colorado
Oligotrophic Lakes in Colorado
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-09-13
Monitoring stations: 2