San Juan County, New Mexico · Water Quality Report Card
Navajo Reservoir Los Pinos River Inflow
Navajo Reservoir Los Pinos River Inflow in San Juan County, New Mexico is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 0.6 ft visibility.
- Clarity
- 0.6 ft
- Mean depth
- ~80 ft est.
- Type
- Hypereutrophic
- Trend
- ↑ Improving
Navajo Reservoir Los Pinos River Inflow is a highly nutrient-loaded hypereutrophic lake in San Juan County, New Mexico with an estimated average depth of about 80 feet. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, NMED, last sampled 2016-07-20. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not rated for swimming — there is not enough monitoring data to judge this lake
Water Quality Grade: Not rated
Very murky, less than 0.6 ft of visibility. Trophic State Index: 86.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.6 ft | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 86 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~80 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. New Mexico has not published bathymetry for Navajo Reservoir Los Pinos River Inflow.
Where to stay near Navajo Reservoir Los Pinos River Inflow
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Fishing Navajo Reservoir Los Pinos River Inflow
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.005 m/yr | 4 |
Location
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Hypereutrophic Lakes in New Mexico
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Where this data comes from
8 measurements from 1 monitoring station, 2012–2016. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- UC Region of USBOR
UC_REGION_USBOR_WQX8 samples · 2012–2016
Monitoring station identifiers (1)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2016-07-20
Monitoring stations: 1