Four Mile Reservoir is a productive, nutrient-rich eutrophic lake in San Juan County, New Mexico. Water quality is graded D based on 1 sampling years through 2015. Compared to the 6 other monitored lakes in San Juan County, Four Mile Reservoir ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, New Mexico DNR, last sampled 2015-05-28. Grade methodology: LakeGrade methodology.
Watch Four Mile Reservoir water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
No clarity data. Phosphorus level: 67 µg/L. Trophic State Index: 65.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 67 µg/L | D |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 65 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Four Mile Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Four Mile Reservoir in San Juan County, New Mexico — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Four Mile Reservoir
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 Four Mile Reservoir?
Get lake water-quality report cards plus the best cabin & lodging deals near Four Mile Reservoir — straight to your inbox. No spam, unsubscribe anytime.
Fishing Four Mile Reservoir
Location
County Ranking
Ranked #6 of 7 lakes in San Juan County
Cleaner Lakes Within 30 Miles
Four Mile Reservoir holds Grade D. One nearby lake has a higher grade.
Nearby Lakes in San Juan County
Explore Four Mile Reservoir across LakeGrade
More New Mexico Lake Rankings
Other Grade D Lakes in New Mexico
Eutrophic Lakes in New Mexico
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: 2015-05-28
Monitoring stations: 1