Chimney Reservoir East Lobe
Humboldt 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.
- Impaired · Mercury
- 22 ft max depth
- Limited data
Chimney Reservoir East Lobe in Humboldt County, Nevada is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 590 µg/L. Chlorophyll-a (algae): 16 µg/L.
- Max depth
- ~22 ft est.
- Phosphorus
- 590 µg/L
- Chlorophyll-a
- 16 µg/L
- Trend
- ↑ Improving
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Watch Chimney Reservoir East Lobe’s letter
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Why Chimney Reservoir East Lobe 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 Chimney Reservoir East Lobe, 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.
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. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is 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.
Water quality measurements for Chimney Reservoir East Lobe
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 590 µg/L. Chlorophyll-a 16 µg/L. TSI 77.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 590 µg/L | Not graded |
| Chlorophyll-a (Algae) | 16 µg/L | Not graded |
| Trophic State Index (TSI) | 77 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum 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
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.
Fishing Chimney Reservoir East Lobe
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -20.9 µg/L/yr | 4 |
| Chlorophyll-a | ↑ Improving | -0.89 µg/L/yr | 2 |
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
Source: EPA ATTAINS assessment unit NV04-LH-95-B_00 · Official waterbody report · Matched by proximity (1.56 km)
Graded lakes near Chimney Reservoir East Lobe
Chimney Reservoir East Lobe has no grade, but these lakes within a short drive do.
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. 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 Chimney Reservoir East Lobe?
- Chimney Reservoir East Lobe in Humboldt County, Nevada is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 590 µg/L. Chlorophyll-a (algae): 16 µg/L.
Is Chimney Reservoir East Lobe safe to swim in?
- The letter is 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)
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)