Finnegan Lake
Finnegan Lake in Oconto County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 10 ft visibility. Phosphorus: 15.3 µg/L. Maximum depth: 38 ft. Surface area: 25 acres.
Wisconsin DNR rates Panfish as abundant on Finnegan Lake. DNR survey details →
- Clarity
- 10 ft
- Max depth
- 38 ft
- Area
- 25 acres
- Trend
- ↑ Improving
- Public access
- Yes
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Why Finnegan Lake 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 Finnegan Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity and phosphorus, but not 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 WI DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Finnegan Lake is a 25-acre lake in Oconto County, Wisconsin with a maximum depth of 38 feet. Overall water quality is improving over recent sampling years. The lake supports 3 documented fish species including Panfish, Largemouth Bass, and Walleye. Public access is available with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2023-08-23. Grade methodology: LakeQuality methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Finnegan Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 10 ft. Phosphorus level: 15.3 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10 ft | Not graded |
| Phosphorus | 15.3 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Finnegan Lake
Compare lakeside cabins, hotels, and vacation rentals near Finnegan Lake in Oconto 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 Finnegan Lake
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Wisconsin DNR rates Panfish as abundant on Finnegan Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Finnegan Lake — official chemistry is on file, not a letter, and the water-quality trend over 2 years of monitoring is improving. 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. 5 stations on file (most recent sample 2023).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 38 ft |
| Surface Area | 25 acres |
| Public Access | Yes |
Recreation & Access
- Finnegan LakePublic
- Riverside County ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Finnegan Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.25 m/yr | 2 |
Regulated Pollution Sources Nearby
4 EPA-permitted facilities operate within about 5 miles of Finnegan Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Gillett Wastewater Treatment FacilityGillett · 1.8 mi away · NPDES WI0022063Recent violation
- Seneca Foods Corporation GillettGillett · 1.5 mi away · NPDES WI0000345
- Horsens Homestead Farms LlcGreen Valley, Town Of · 2.9 mi away · NPDES WI0066494
- Blaser Farms IncGillett · 3.7 mi away · NPDES WI0064246
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Graded lakes near Finnegan Lake
Finnegan Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Oconto County
Frequently asked questions about Finnegan Lake
Where is Finnegan Lake?
- Finnegan Lake is a lake in Oconto County, Wisconsin. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Finnegan Lake?
- Finnegan Lake in Oconto County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 10 ft visibility. Phosphorus: 15.3 µg/L. Maximum depth: 38 ft. Surface area: 25 acres.
Is Finnegan Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Finnegan Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
How deep is Finnegan Lake?
- Finnegan Lake has a maximum depth of 38 feet. The lake covers 25 acres.
What fish are in Finnegan Lake?
- Fish species found in Finnegan Lake include Panfish, Largemouth Bass, Walleye. Finnegan Lake is located in Oconto County, Wisconsin.
What did the DNR fisheries survey find at Finnegan Lake?
- Wisconsin DNR rates Panfish as abundant on Finnegan Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Finnegan Lake — official chemistry is on file, not a letter, and the water-quality trend over 2 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Finnegan Lake?
- Finnegan Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Finnegan Lake, Riverside County Park. Public access is listed as yes.
Explore Finnegan Lake across LakeQuality
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Where this data comes from
10 measurements from 1 monitoring station, 2022–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX10 samples · 2022–2023
Analytical methods
- Phosphorus by Colorimetry
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory