Tonkin Reservoir
Eureka County, Nevada10 acresView 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
Tonkin Reservoir in Eureka County, Nevada is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 20 µg/L. Surface area: 10 acres.
- Area
- 10 acres
- Phosphorus
- 20 µg/L
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Watch Tonkin Reservoir’s letter
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Why Tonkin Reservoir 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 Tonkin Reservoir, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
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.
Tonkin Reservoir is a 10-acre lake in Eureka County, Nevada.
Source: EPA Water Quality Portal sampling records, NDEP, last sampled 2014-04-24. 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 Tonkin Reservoir
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 20 µg/L. TSI 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 20 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 10 acres |
No bathymetric survey has been published for Tonkin Reservoir, so its depth is not documented here.
Fishing Tonkin Reservoir
Reservoir Info (USACE NID)
Tonkin Reservoir is a man-made reservoir impounded by the Tonkin Reservoir Dam (completed 2016), built primarily for irrigation on the Denay Creek; earth-type dam, 18 ft tall and 710 ft long.
- Surface area
- 10 ac
- Normal storage
- 50 ac-ft
- Max storage
- 50 ac-ft
- Drainage area
- 18 sq mi
- Hazard class
- Low
- Owner
- NEVADA GOLD MINES LLC
All listed purposes: Irrigation;Fire Protection, Stock, Or Small Fish Pond.
Source: USACE National Inventory of Dams, NID ID NV00188 · Operator website
Graded lakes near Tonkin Reservoir
Tonkin Reservoir has no grade, but these lakes within a short drive do.
Nearby Lakes in Eureka County
Frequently asked questions about Tonkin Reservoir
Where is Tonkin Reservoir?
- Tonkin Reservoir is a lake in Eureka 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 Tonkin Reservoir?
- Tonkin Reservoir in Eureka County, Nevada is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 20 µg/L. Surface area: 10 acres.
Is Tonkin Reservoir safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Tonkin Reservoir across LakeQuality
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Where this data comes from
6 measurements from 1 monitoring station, 2013–2014. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Nevada Division of Environmental Protection
21NEV1_WQX6 samples · 2013–2014
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
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.