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B

King Lake

Polk County, WisconsinMesotrophic

King Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

Mesotrophic conditions dominate at King Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. At only 14 ft deep, King Lake is shallow — wind keeps the water column mixed and sediment resuspension drives phosphorus levels harder to manage. At 53 acres, King Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. King Lake ranks 23 of 74 in Polk County — solidly in the upper half of the local distribution.

King Lake has no invasive species recorded in Wisconsin state databases as of 2023, though prevention practices still apply at all access points. Bass fishing is part of the appeal: the species list runs to 3, anchored by largemouth and/or smallmouth bass. Public access is available — the lake is on the Wisconsin DNR public-access list. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2023-09-11. Grade methodology: LakeGrade methodology.

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Good clarity, visible to about 11.5 ft. Phosphorus level: 20.6 µg/L. Trophic State Index: 45.

MetricValueGrade
Water Clarity (Secchi Depth)11.5 ftB
Phosphorus20.6 µg/LB
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)45Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth14 ft
Surface Area53 acres
Public AccessYes

Fish Species

Click a species to see every graded lake where it is documented.

→ 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 2 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-1 m/yr2
Phosphorus Stable+0.4 µg/L/yr2

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #23 of 74 lakes in Polk County

Nearby Lakes in Polk County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2023).

Fish Species (DNR-rated)

Panfish(Present)Largemouth Bass(Present)Northern Pike(Present)

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Fish and recreation data from Wisconsin DNR Lakes

Public boat-access points from the USGS National Boat Ramps inventory

Most recent sample: 2023-09-11

Monitoring stations: 1

Where to stay near King Lake

Compare lakeside cabins, hotels, and vacation rentals near King Lake in Polk County, Wisconsin — live availability and prices for your trip.

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