Chimney Reservoir East Lobe
Humboldt County, NevadaView mapDirections
NDEP publishes the water-quality measurements for Chimney Reservoir East Lobe. Here is what has been measured.
- Impaired · Mercury
- 22 ft max depth
- Limited data
Chimney Reservoir East Lobe in Humboldt County, Nevada has water-quality measurements published by NDEP, shown here as reported. Phosphorus: 590 µg/L. Chlorophyll-a (algae): 16 µg/L.
Chimney Reservoir East Lobe is a lake in Humboldt County, Nevada with an estimated average depth of about 22 feet. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, NDEP, last sampled 2012-09-19. Methodology: how these readings are compared.
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Chimney Reservoir East Lobe 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 East Lobe 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 East Lobe
These are the measurements NDEP publishes for Chimney Reservoir East Lobe, 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 590 µg/L. Chlorophyll-a 16 µg/L. TSI 77.
| 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 | 590µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 16µg/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. | 77 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Chimney Reservoir East Lobe
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~22 ft est.
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Nevada has not published bathymetry for Chimney Reservoir East Lobe.
Lake Size & Watershed
Watershed (drainage) area
763 sq mi
HydroLAKES / HydroSHEDS
Surface area
554 acres
HydroLAKES / HydroSHEDS
Shoreline
4.7 mi
HydroLAKES / HydroSHEDS
Elevation
4,626 ft
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.
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Fishing Chimney Reservoir East Lobe
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 East Lobe 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 East Lobe
Where is Chimney Reservoir East Lobe?
- Chimney Reservoir East Lobe 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 East Lobe?
- Chimney Reservoir East Lobe in Humboldt County, Nevada has water-quality measurements published by NDEP, shown here as reported. Phosphorus: 590 µg/L. Chlorophyll-a (algae): 16 µg/L.
Is Chimney Reservoir East Lobe safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Chimney Reservoir East Lobe 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.
How deep is Chimney Reservoir East Lobe?
- No published bathymetric survey covers Chimney Reservoir East Lobe, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 22 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
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Where this data comes from
4 measurements from 1 monitoring station, 2012. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Nevada Division of Environmental Protection
21NEV1_WQX4 samples · 2012
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 10200 H ~ Chlorophyll a-b-c Determination
Monitoring station identifiers (1)
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
Lake size & watershed from HydroLAKES (HydroSHEDS)