Navajo Reservoir la Jara Confluence
Rio Arriba County, New MexicoView mapDirections
Not enough samples to grade — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. No letter yet. Here is what we do have.
- Limited data
Navajo Reservoir la Jara Confluence in Rio Arriba County, New Mexico is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 13.5 ft visibility. Chlorophyll-a (algae): 1.6 µg/L.
- Clarity
- 13.5 ft
- Chlorophyll-a
- 1.6 µg/L
- Trend
- ↑ Improving
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Watch Navajo Reservoir la Jara Confluence’s letter
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Why Navajo Reservoir la Jara Confluence 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 Navajo Reservoir la Jara Confluence, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. 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.
Navajo Reservoir la Jara Confluence is a lake in Rio Arriba County, New Mexico. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, NMED, last sampled 2016-07-20. Grade methodology: LakeQuality methodology.
What Navajo Reservoir la Jara Confluence is good for
From access and monitoring records, not editorial picks.
- Clear water13.5 ft of visibility
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Navajo Reservoir la Jara Confluence
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 13.5 ft. Chlorophyll-a 1.6 µg/L. TSI 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 1.6 µg/L | Not graded |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Navajo Reservoir la Jara Confluence
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.483 m/yr | 4 |
| Chlorophyll-a | ↑ Improving | -0.6 µg/L/yr | 2 |
Nearby Lakes in Rio Arriba County
Frequently asked questions about Navajo Reservoir la Jara Confluence
Where is Navajo Reservoir la Jara Confluence?
- Navajo Reservoir la Jara Confluence is a lake in Rio Arriba County, New Mexico. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Navajo Reservoir la Jara Confluence?
- Navajo Reservoir la Jara Confluence in Rio Arriba County, New Mexico is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 13.5 ft visibility. Chlorophyll-a (algae): 1.6 µg/L.
Is Navajo Reservoir la Jara Confluence safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Navajo Reservoir la Jara Confluence across LakeQuality
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Where this data comes from
14 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_WQX14 samples · 2012–2016
Analytical methods
- Standard Methods for the Examination of Water and Wastewater
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.