Lahontan Reservoir Narrows Inlet
Lyon County, NevadaView mapDirections
NDEP publishes the water-quality measurements for Lahontan Reservoir Narrows Inlet. Here is what has been measured.
- Impaired · Mercury
- Limited data
Lahontan Reservoir Narrows Inlet in Lyon County, Nevada has water-quality measurements published by NDEP, shown here as reported. Phosphorus: 350 µg/L. Chlorophyll-a (algae): 7.1 µg/L.
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. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Lahontan Reservoir Narrows Inlet is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), oxygen depletion (low DO). Check local advisories before you swim.
Whether Lahontan Reservoir Narrows Inlet is safe to swim in today is a call for the Nevada Division of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lahontan Reservoir Narrows Inlet
These are the measurements NDEP publishes for Lahontan Reservoir Narrows Inlet, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 350 µg/L. Chlorophyll-a 7.1 µg/L. TSI 69.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 350µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 7.1µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 69 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Lahontan Reservoir Narrows Inlet
Answers come straight from the public measurements and survey records on this page.
→ Lahontan Reservoir Narrows Inlet water level: the live USGS gauge reading
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Fishing Lahontan Reservoir Narrows Inlet
Water quality readings over time
2 seasons of samples on record (2012–2013). Calling a direction takes at least 4 years of the same measurement.
Phosphorus
Improving-50 µg/L/yr2 years
Chlorophyll-a
Worsening+3.1 µg/L/yr2 years
EPA Impairment Status
Lahontan Reservoir Narrows Inlet is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption, Other.
Source: EPA ATTAINS assessment unit NV08-CR-46_00 · Official waterbody report
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. Its water-quality measurements are published by NDEP and shown on this page as reported.
What is the water quality of Lahontan Reservoir Narrows Inlet?
- Lahontan Reservoir Narrows Inlet in Lyon County, Nevada has water-quality measurements published by NDEP, shown here as reported. Phosphorus: 350 µg/L. Chlorophyll-a (algae): 7.1 µg/L.
Is Lahontan Reservoir Narrows Inlet safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lahontan Reservoir Narrows Inlet is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), oxygen depletion (low DO). Check local advisories before you swim.
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database