Second Lake
Oneida County, Wisconsin103 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Second Lake. Here is what has been measured.
- Impaired · Mercury
- 11 ft max depth
- Limited data
Second Lake in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 3.7 ft visibility. Maximum depth: 11 ft. Surface area: 103 acres.
Wisconsin DNR lists Panfish as common on Second Lake. DNR survey details →
Second Lake is a 103-acre lake in Oneida County, Wisconsin with a maximum depth of 11 feet. Water clarity is declining over recent sampling years. The lake supports 6 documented fish species including Musky, Panfish, and Largemouth Bass.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2023-08-21. Methodology: how these readings are compared.
Second Lake covers about 100 acres in Oneida County. Vrbo is where to look for cabins and lake homes around Second Lake, and Booking.com and Expedia search hotels near the lake for your dates.
What Second Lake is good for
From access and monitoring records, not editorial picks.
- Fishing6 species recorded
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Second Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Second 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 Second Lake
These are the measurements Wisconsin DNR publishes for Second 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 3.7 ft. TSI 58.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.7ft | 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. | 58 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Second Lake
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR lists Panfish as common on Second Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Second Lake’s water-quality measurements separately, and the water-quality trend over 7 years of monitoring is stable. 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 2023).
Fish Species (DNR-rated)
Lake Details
Max depth
11 ft
Surface area
103 acres
Stays via Stay22
Stays near Second Lake
Compare lakeside cabins, hotels, and vacation rentals near Second Lake in Oneida County, Wisconsin — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Second Lake
Prices for Oct 16–18, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Follow Second Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fish Species
Click a species to see every lake where it is documented.
Fishing Second Lake
Water Quality Trend: Stable
Based on 7 years of monitoring (2020–2026).
Water clarity
Worsening7 years
Phosphorus
Improving-0.79 µg/L/yr7 years
EPA Impairment Status
Second Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption.
Source: EPA ATTAINS assessment unit WI10007424 · Official waterbody report
Nearby Lakes in Oneida County
Frequently asked questions about Second Lake
Where is Second Lake?
- Second Lake is a lake in Oneida County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Second Lake?
- Second Lake in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 3.7 ft visibility. Maximum depth: 11 ft. Surface area: 103 acres.
Is Second Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Second Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
How deep is Second Lake?
- Second Lake has a maximum depth of 11 feet. The lake covers 103 acres.
What fish are in Second Lake?
- Fish species found in Second Lake include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Second Lake is located in Oneida County, Wisconsin.
What did the DNR fisheries survey find at Second Lake?
- Wisconsin DNR lists Panfish as common on Second Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Second Lake’s water-quality measurements separately, and the water-quality trend over 7 years of monitoring is stable. Catch rate is not a swim clearance and is not a weekly bite report.
Explore Second Lake across LakeQuality
Fish species and the cleanest lakes across Wisconsin
Fish species and best lakes in Oneida County
Species activity outlook by water temperature and season
Top lakes and where to stay in the Northwoods Wisconsin area
Top lakes and where to stay in the Minocqua Chain area
Where to stay at Wisconsin's top lakes, each with its readings
Lakes in the Wisconsin River Watershed, ranked by water quality
Wisconsin's cleanest lakes, ranked on agency measurements
More lakes in Wisconsin
Other Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Where this data comes from
19 measurements from 1 monitoring station, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX19 samples · 2020–2023
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
Fish and recreation data from Wisconsin DNR Lakes