Four Mile Reservoir
San Juan County, New MexicoView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Limited data
Four Mile Reservoir in San Juan County, New Mexico is not rated for water quality — its monitoring record does not meet the evidence bar.
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Stays 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.
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Watch Four Mile Reservoir’s letter
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Why Four Mile Reservoir has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Four Mile Reservoir, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by NMED and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Four Mile Reservoir is a lake in San Juan County, New Mexico.
Source: EPA Water Quality Portal sampling records, NMED, last sampled 2015-05-28. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Four Mile Reservoir
These readings exist but are not enough for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Fishing Four Mile Reservoir
Graded lakes near Four Mile Reservoir
Four Mile Reservoir has no grade, but these lakes within a short drive do.
Nearby Lakes in San Juan County
Frequently asked questions about Four Mile Reservoir
Where is Four Mile Reservoir?
- Four Mile Reservoir is a lake in San Juan County, New Mexico. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Four Mile Reservoir?
- Four Mile Reservoir in San Juan County, New Mexico is not rated for water quality — its monitoring record does not meet the evidence bar.
Is Four Mile Reservoir safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Four Mile Reservoir across LakeQuality
Planning a trip around Mesa Verde?
Four Mile Reservoir is about 27 miles from Mesa Verde National Park. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Mesa Verde →More New Mexico Lake Rankings
Other Lakes in New Mexico
Where this data comes from
1 measurement from 1 monitoring station, 2015. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Ute Mountain Utes Tribe (Colorado) (Tribal)
UTEMTN1 sample · 2015
Analytical methods
- Phosphorus by Two Reagent Colorimetry
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.