Seneca Lake
Vilas County, Wisconsin18 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Seneca Lake. Here is what has been measured.
- 10 ft max depth
- Limited data
Seneca Lake in Vilas County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 6.3 ft visibility. Maximum depth: 10 ft. Surface area: 18 acres.
Wisconsin DNR lists Panfish as present on Seneca Lake. DNR survey details →
Seneca Lake is a 18-acre lake in Vilas County, Wisconsin with a maximum depth of 10 feet. The lake supports 2 documented fish species including Panfish and Largemouth Bass.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2022-08-30. 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 Seneca Lake is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Seneca Lake
These are the measurements Wisconsin DNR publishes for Seneca Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 6.3 ft. TSI 51.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 6.3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading 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. | 51 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Seneca Lake
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR lists Panfish as present on Seneca Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Seneca Lake’s water-quality measurements separately. Catch rate is not a swim clearance and is not a weekly bite report.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2022).
Fish Species (DNR-rated)
Lake Details
Max depth
10 ft
Surface area
18 acres
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Fish Species
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Fishing Seneca Lake
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Frequently asked questions about Seneca Lake
Where is Seneca Lake?
- Seneca Lake is a lake in Vilas County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Seneca Lake?
- Seneca Lake in Vilas County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 6.3 ft visibility. Maximum depth: 10 ft. Surface area: 18 acres.
Is Seneca Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Seneca Lake?
- Seneca Lake has a maximum depth of 10 feet. The lake covers 18 acres.
What fish are in Seneca Lake?
- Fish species found in Seneca Lake include Panfish, Largemouth Bass. Seneca Lake is located in Vilas County, Wisconsin.
What did the DNR fisheries survey find at Seneca Lake?
- Wisconsin DNR lists Panfish as present on Seneca Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Seneca Lake’s water-quality measurements separately. Catch rate is not a swim clearance and is not a weekly bite report.
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Where this data comes from
2 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX2 samples · 2022
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
Fish and recreation data from Wisconsin DNR Lakes