Lahontan Reservoir Narrows Inlet
Lyon County, NevadaView 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
Lahontan Reservoir Narrows Inlet in Lyon County, Nevada is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 350 µg/L. Chlorophyll-a (algae): 7.1 µg/L.
- Phosphorus
- 350 µg/L
- Chlorophyll-a
- 7.1 µg/L
- Trend
- → Stable
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Watch Lahontan Reservoir Narrows Inlet’s letter
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Why Lahontan Reservoir Narrows Inlet 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 Lahontan Reservoir Narrows Inlet, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.
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 NDEP and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lahontan Reservoir Narrows Inlet is a lake in Lyon County, Nevada. Phosphorus level is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, NDEP, last sampled 2013-08-21. 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 Lahontan Reservoir Narrows Inlet
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 350 µg/L. Chlorophyll-a 7.1 µg/L. TSI 69.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 350 µg/L | Not graded |
| Chlorophyll-a (Algae) | 7.1 µg/L | Not graded |
| Trophic State Index (TSI) | 69 | Eutrophic |
High nutrients, frequent algae, reduced clarity
→ Lahontan Reservoir Narrows Inlet water level: the live USGS gauge reading
Fishing Lahontan Reservoir Narrows Inlet
Water Quality Trend: → Stable
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -50 µg/L/yr | 2 |
| Chlorophyll-a | ↓ Declining | +3.1 µg/L/yr | 2 |
Graded lakes near Lahontan Reservoir Narrows Inlet
Lahontan Reservoir Narrows Inlet has no grade, but these lakes within a short drive do.
Nearby Lakes in Lyon County
Frequently asked questions about Lahontan Reservoir Narrows Inlet
Where is Lahontan Reservoir Narrows Inlet?
- Lahontan Reservoir Narrows Inlet is a lake in Lyon County, Nevada. 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 Lahontan Reservoir Narrows Inlet?
- Lahontan Reservoir Narrows Inlet in Lyon County, Nevada is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 350 µg/L. Chlorophyll-a (algae): 7.1 µg/L.
Is Lahontan Reservoir Narrows Inlet safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Lahontan Reservoir Narrows Inlet across LakeQuality
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Where this data comes from
34 measurements from 2 monitoring stations, 2012–2013. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Nevada Division of Environmental Protection
21NEV1_WQX34 samples · 2012–2013
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 10200 H ~ Chlorophyll a-b-c Determination
Monitoring station identifiers (2)
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.