Chimney Reservoir West Lobe North
Humboldt County, NevadaView mapDirections
NDEP publishes the water-quality measurements for Chimney Reservoir West Lobe North. Here is what has been measured.
- Impaired · Mercury
- Limited data
Chimney Reservoir West Lobe North in Humboldt County, Nevada has water-quality measurements published by NDEP, shown here as reported. Phosphorus: 480 µg/L. Chlorophyll-a (algae): 13 µg/L.
Chimney Reservoir West Lobe North is a lake in Humboldt County, Nevada. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, NDEP, last sampled 2014-06-11. Methodology: how these readings are compared.
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Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Chimney Reservoir West Lobe North is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), nutrients (phosphorus, nitrogen), temperature, toxic inorganics, turbidity. Check local advisories before you swim.
Whether Chimney Reservoir West Lobe North 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 Chimney Reservoir West Lobe North
These are the measurements NDEP publishes for Chimney Reservoir West Lobe North, 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 480 µg/L. Chlorophyll-a 13 µg/L. TSI 74.
| 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 | 480µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 13µg/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. | 74 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Chimney Reservoir West Lobe North
Answers come straight from the public measurements and survey records on this page.
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Fishing Chimney Reservoir West Lobe North
Water Quality Trend: Improving
Based on 4 years of monitoring (2012–2021).
Phosphorus
Improving-20.9 µg/L/yr4 years
Chlorophyll-a
Improving-0.89 µg/L/yr2 years
EPA Impairment Status
Chimney Reservoir West Lobe North 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: Drinking water, Aquatic life, Fish consumption, Recreation, Other.
Source: EPA ATTAINS assessment unit NV04-LH-95-B_00 · Official waterbody report
Nearby Lakes in Humboldt County
Frequently asked questions about Chimney Reservoir West Lobe North
Where is Chimney Reservoir West Lobe North?
- Chimney Reservoir West Lobe North is a lake in Humboldt County, Nevada. Its water-quality measurements are published by NDEP and shown on this page as reported.
What is the water quality of Chimney Reservoir West Lobe North?
- Chimney Reservoir West Lobe North in Humboldt County, Nevada has water-quality measurements published by NDEP, shown here as reported. Phosphorus: 480 µg/L. Chlorophyll-a (algae): 13 µg/L.
Is Chimney Reservoir West Lobe North safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Chimney Reservoir West Lobe North is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), nutrients (phosphorus, nitrogen), temperature, toxic inorganics, turbidity. Check local advisories before you swim.
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Where this data comes from
11 measurements from 2 monitoring stations, 2012–2014. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Nevada Division of Environmental Protection
21NEV1_WQX11 samples · 2012–2014
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