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D

Dowling Lake

Douglas County, WisconsinEutrophic

Dowling Lake pulls a D on the LakeGrade rubric — phosphorus loading and limited clarity hold it below the Wisconsin average. Clarity is the limiting factor — phosphorus is reasonable but suspended particles or algal cells keep water transparency below Wisconsin norms.

At a TSI of 62, Dowling Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. A maximum depth of just 13 ft means sediment-bound phosphorus releases back into the water column whenever wind stirs the bottom — a classic shallow-lake dynamic. Dowling Lake covers 141 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within Douglas County's 40 graded lakes, Dowling Lake ranks 26 — below the local median, though not at the bottom.

An invasive species record — Curly-Leaf Pondweed — has been logged at Dowling Lake; Wisconsin DNR maintains the official infested-waters list. Walleye are documented at Dowling Lake, one of 5 fish species on record for the lake. 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 2020-10-13. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Very murky, less than 2.5 ft of visibility. Phosphorus level: 50 µg/L. Trophic State Index: 62.

MetricValueGrade
Water Clarity (Secchi Depth)2.5 ftF
Phosphorus50 µg/LC
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)62Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Maximum Depth13 ft
Surface Area141 acres

Fish Species

Click a species to see all Wisconsin and Minnesota lakes where it is found.

→ Best fishing times for Dowling Lake (14-day solunar calendar)

→ Is it safe to eat fish from Dowling Lake? (mercury & PFAS guide)

Dowling Lake fishing regulations (limits, seasons, special rules)

Invasive & Introduced Species

Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.

Curly-Leaf Pondweed

Water Quality Trend: Improving

Based on 6 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+0.157 m/yr5
Phosphorus Improving-4.35 µg/L/yr6
See year-by-year chart →

Location

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County Ranking

Ranked #26 of 40 lakes in Douglas County

Cleaner Lakes Within 30 Miles

Dowling Lake holds Grade D. 3 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Douglas County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 4 stations on file (most recent sample 2020).

Fish Species (DNR-rated)

Panfish(Abundant)Musky(Common)Largemouth Bass(Common)Northern Pike(Present)Walleye(Present)

DNR Reports & Resources

Wisconsin DNR Fisheries scientists publish multi-year survey reports for Dowling Lake covering fish populations, stocking, water quality, and management. 1 report on file.

EPA Impairment Status

Dowling Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Cause unknown

Source: EPA ATTAINS assessment unit WI10010837 · Official waterbody report

Data Sources

Water quality data from the EPA Water Quality Portal

Impairment status from EPA ATTAINS 303(d) database

Grading methodology based on Metropolitan Council standards

Most recent sample: 2020-10-13

Monitoring stations: 1