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.
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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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 ft | F |
| Phosphorus | 50 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 13 ft |
| Surface Area | 141 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.
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.157 m/yr | 5 |
| Phosphorus | ↑ Improving | -4.35 µg/L/yr | 6 |
Location
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.
- BLake NebagamonDouglas County · mi · Two grade letters higher (D → B)
- BLake MinnesuingDouglas County · mi · Two grade letters higher (D → B)
- CAmnicon LakeDouglas County · mi · Higher grade (D → C)
Nearby Lakes in Douglas County
More Wisconsin Lake Rankings
State Parks Near Dowling Lake
Other Grade D Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 4 stations on file (most recent sample 2020).
Fish Species (DNR-rated)
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.
- 2024Dowling Lake spring shocking survey, 2024Spring Shocking Survey · WI DNR · 2024 (PDF)
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
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