Tonkin Reservoir
Eureka County, Nevada10 acresView mapDirections
NDEP publishes the water-quality measurements for Tonkin Reservoir. Here is what has been measured.
- Limited data
Tonkin Reservoir in Eureka County, Nevada has water-quality measurements published by NDEP, shown here as reported. Phosphorus: 20 µg/L. Surface area: 10 acres.
Tonkin Reservoir is a 10-acre lake in Eureka County, Nevada.
Source: EPA Water Quality Portal sampling records, NDEP, last sampled 2014-04-24. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Tonkin Reservoir 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 Tonkin Reservoir
These are the measurements NDEP publishes for Tonkin Reservoir, 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 20 µg/L. TSI 47.
| 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 | 20µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | No reading 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. | 47 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Tonkin Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
10 acres
No bathymetric survey has been published for Tonkin Reservoir, so its depth is not documented here.
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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
Nearby Lakes in Eureka County
Frequently asked questions about Tonkin Reservoir
Where is Tonkin Reservoir?
- Tonkin Reservoir is a lake in Eureka County, Nevada. Its water-quality measurements are published by NDEP and shown on this page as reported.
What is the water quality of Tonkin Reservoir?
- Tonkin Reservoir in Eureka County, Nevada has water-quality measurements published by NDEP, shown here as reported. Phosphorus: 20 µg/L. Surface area: 10 acres.
Is Tonkin Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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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)
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.