King Lake
King Lake in Marinette County, Wisconsin has a water quality grade of A (Excellent). Phosphorus: 9 µg/L. Chlorophyll-a (algae): 0.8 µg/L. Maximum depth: 70 ft. Surface area: 30 acres.
- Typical in August
- 53°F
- Max depth
- 70 ft
- Area
- 30 acres
- Type
- Oligotrophic
- Trend
- ↑ Improving
Next lake in Marinette County
King Lake is a 30-acre cold, clear oligotrophic lake in Marinette County, Wisconsin with a maximum depth of 70 feet. Water quality is graded A based on 2 sampling years through 2025. Overall water quality is improving over recent sampling years. The lake supports 2 documented fish species including Panfish and Largemouth Bass. Compared to the 9 other monitored lakes in Marinette County, King Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-11-20. Grade methodology: LakeGrade methodology.
Watch King Lake water quality
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Swimming Safety
Grade onlyBacteria A
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.
Based on E. coli testing, King Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 15 samples across 5 seasons.
This is a historical summary of past testing, not a current condition — bacteria levels change quickly, especially after rain. Always check Wisconsin’s current beach and health-department advisories before swimming.
Water Quality Grade: A (Excellent)
No clarity data. Phosphorus level: 9 µg/L. Chlorophyll-a: 0.8 µg/L. Trophic State Index: 32.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 9 µg/L | Good |
| Chlorophyll-a (Algae) | 0.8 µg/L | Good |
| Trophic State Index (TSI) | 32 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near King Lake
Compare lakeside cabins, hotels, and vacation rentals near King 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.
Top-rated places to stay near King Lake
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Water Temperature
King Lake typically sits around 53°F at the surface in August. Summer average is about 51°F. Usually warmest in Sep (about 55°F) and coldest in Apr (about 42°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 287 field readings (2024–2025) via the EPA Water Quality Portal. See the full King Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 70 ft |
| Surface Area | 30 acres |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fish Species
Click a species to see every graded lake where it is documented.
Fishing King Lake
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages.
Fish Species (DNR-rated)
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | → Stable | +0.17 µg/L/yr | 6 |
| Chlorophyll-a | ↑ Improving | -0.05 µg/L/yr | 6 |
County Ranking
Ranked #1 of 10 lakes in Marinette County
Nearby Lakes in Marinette County
Frequently asked questions about King Lake
What is the water quality grade for King Lake?
- King Lake in Marinette County, Wisconsin has a water quality grade of A (Excellent). Phosphorus: 9 µg/L. Chlorophyll-a (algae): 0.8 µg/L. Maximum depth: 70 ft. Surface area: 30 acres.
Is King Lake safe to swim in?
- Based on E. coli testing, King Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 15 samples across 5 seasons. That works out to a bacteria swim-safety grade of A — a historical summary of past testing, not a current reading. King Lake has a water quality grade of A (Excellent). Bacteria levels can spike quickly after heavy rain, so always check Wisconsin's current beach and health-department advisories before you swim.
What is the water temperature of King Lake?
- King Lake typically sits around 53°F at the surface in August, from 287 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
How deep is King Lake?
- King Lake has a maximum depth of 70 feet. The lake covers 30 acres.
What fish are in King Lake?
- Fish species found in King Lake include Panfish, Largemouth Bass. King Lake is located in Marinette County, Wisconsin.
Explore King Lake across LakeGrade
Fish species and top-graded lakes across Wisconsin
Fish species and best lakes in Marinette County
Species activity outlook by water temperature and season
Where to stay at Wisconsin's top lakes, each with its grade
Low nutrients, clear water, excellent for swimming
Wisconsin's cleanest and most-polluted lakes, ranked
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State Parks Near King Lake
Other Grade A Lakes in Wisconsin
Oligotrophic Lakes in Wisconsin
Where this data comes from
79 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Forest County Potawatomi Community (Tribal)
FCPOTAWATOMI_WQX79 samples · 2020–2025
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 4500 P F ~ Phosphorus in Water by Colorimetry Automated Ascorbic Acid Method
- 10200 H ~ Chlorophyll a-b-c Determination
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes