Yankee Lake
Yankee Lake in Marinette County, Wisconsin has a water quality grade of C (Fair). Water clarity: 3 ft visibility. Phosphorus: 26.5 µg/L. Maximum depth: 20 ft. Surface area: 14 acres.
- Clarity
- 3 ft
- Max depth
- 20 ft
- Area
- 14 acres
- Type
- Eutrophic
- Trend
- → Stable
- Public access
- Yes
Next lake in Marinette County
Yankee Lake is a 14-acre productive, nutrient-rich eutrophic lake in Marinette County, Wisconsin with a maximum depth of 20 feet. Water quality is graded C based on 1 sampling years through 2024. Water clarity is improving over recent sampling years. The lake supports 2 documented fish species including Panfish and Largemouth Bass. Public access is available. Compared to the 9 other monitored lakes in Marinette County, Yankee Lake ranks #10 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2024-07-29. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Very murky, less than 3 ft of visibility. Phosphorus level: 26.5 µg/L. Trophic State Index: 56.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 ft | Not graded |
| Phosphorus | 26.5 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 56 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Yankee Lake
Compare lakeside cabins, hotels, and vacation rentals near Yankee Lake in Marinette 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.
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 20 ft |
| Surface Area | 14 acres |
| Public Access | Yes |
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Yankee Lake
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2024).
Fish Species (DNR-rated)
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +3.383 m/yr | 6 |
| Phosphorus | ↓ Declining | +2.09 µg/L/yr | 3 |
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Yankee Lake under Clean Water Act (NPDES) discharge permits.
- Jfrp Enter Llc D/B/A Tall Oaks General StoreStephenson · 0.2 mi away · NPDES WI0057142
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.
County Ranking
Ranked #10 of 10 lakes in Marinette County
Nearby Lakes With Higher Grades
Yankee Lake holds Grade C. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Marinette County
Frequently asked questions about Yankee Lake
What is the water quality grade for Yankee Lake?
- Yankee Lake in Marinette County, Wisconsin has a water quality grade of C (Fair). Water clarity: 3 ft visibility. Phosphorus: 26.5 µg/L. Maximum depth: 20 ft. Surface area: 14 acres.
Is Yankee Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Yankee Lake has a water quality grade of C (Fair). Always check local health department advisories before swimming.
How deep is Yankee Lake?
- Yankee Lake has a maximum depth of 20 feet. The lake covers 14 acres.
What fish are in Yankee Lake?
- Fish species found in Yankee Lake include Panfish, Largemouth Bass. Yankee Lake is located in Marinette County, Wisconsin.
Explore Yankee Lake across LakeGrade
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Species activity outlook by water temperature and season
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High nutrients, frequent algae, reduced clarity
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State Parks Near Yankee Lake
Other Grade C Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Where this data comes from
17 measurements from 1 monitoring station, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX17 samples · 2021–2024
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