Monastery Lake Deep
San Miguel 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
Monastery Lake Deep in San Miguel County, New Mexico is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4.1 ft visibility. Chlorophyll-a (algae): 7.8 µg/L.
- Clarity
- 4.1 ft
- Chlorophyll-a
- 7.8 µg/L
Stays via Stay22
Stays near Monastery Lake Deep
Compare lakeside cabins, hotels, and vacation rentals near Monastery Lake Deep in San Miguel 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 Monastery Lake Deep
Prices for Sep 11–13, 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 whole trip? See where to stay at New Mexico’s top lakes →
Watch Monastery Lake Deep’s letter
Email me if this lake’s grade moves. Grades stay free.
Or email
Why Monastery Lake Deep 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 Monastery Lake Deep, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity and algae (chlorophyll-a), but not phosphorus.
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.
Monastery Lake Deep is a lake in San Miguel County, New Mexico.
Source: EPA Water Quality Portal sampling records, NMED, last sampled 2019-09-18. 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 Monastery Lake Deep
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 4.1 ft. Chlorophyll-a 7.8 µg/L. TSI 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.1 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 7.8 µg/L | Not graded |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Monastery Lake Deep
Nearby Lakes in San Miguel County
Frequently asked questions about Monastery Lake Deep
Where is Monastery Lake Deep?
- Monastery Lake Deep is a lake in San Miguel 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 Monastery Lake Deep?
- Monastery Lake Deep in San Miguel County, New Mexico is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4.1 ft visibility. Chlorophyll-a (algae): 7.8 µg/L.
Is Monastery Lake Deep safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Monastery Lake Deep across LakeQuality
More New Mexico Lake Rankings
Other Lakes in New Mexico
Eutrophic Lakes in New Mexico
Where this data comes from
3 measurements from 1 monitoring station, 2019. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- NM Environmental Dept./SWQB
21NMEX_WQX3 samples · 2019
Analytical methods
- 10200 H 2 ~ Chlorophyll a-b-c Determination by spectrophotometer
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.