King Lake
Marinette County, WisconsinLimited DataOligotrophic
On the LakeGrade rubric, King Lake pulls an A: clarity readings still being added and 9 µg/L of phosphorus put it in the top bracket for Wisconsin.
A TSI value of 36 puts King Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. The lake's 70 ft maximum depth is in the upper tier for Wisconsin — deep enough for cold-water fish to find refuge in summer. The lake is compact at 30 acres, with partial shoreline records and little volume to buffer nutrient inputs. Among the 21 graded lakes in Marinette County, King Lake sits at rank 7, above the county median.
No invasive species are currently listed at King Lake — the lake remains off the Wisconsin infested-waters roster. Bass fishing is part of the appeal: the species list runs to 2, anchored by largemouth and/or smallmouth bass. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-11-20. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
No clarity data. Phosphorus level: 9 µg/L. Trophic State Index: 36.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 9 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 36 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 70 ft |
| Surface Area | 30 acres |
Fish Species
Click a species to see all Wisconsin and Minnesota lakes where it is found.
→ Best fishing times for King Lake (14-day solunar calendar)
→ Is it safe to eat fish from King Lake? (mercury & PFAS guide)
→ King Lake fishing regulations (limits, seasons, special rules)
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +0.21 µg/L/yr | 6 |
Location
County Ranking
Ranked #7 of 21 lakes in Marinette County
Nearby Lakes in Marinette County
More Wisconsin Lake Rankings
State Parks Near King Lake
Other Grade A Lakes in Wisconsin
Washington County · Clarity: 11.8 ft
Washington County · Clarity: 12.6 ft
Walworth County · Clarity: 11 ft
Waukesha County · Clarity: 11.3 ft
Walworth County · Clarity: 20.2 ft
Kenosha County · Clarity: 10 ft
Oligotrophic Lakes in Wisconsin
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages.
Fish Species (DNR-rated)
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-11-20
Monitoring stations: 1