Lake Minnesuing
Douglas County, WisconsinMesotrophic
Lake Minnesuing carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. Secchi readings are the weakest of the scored parameters, suggesting suspended sediment or algal biomass dominates the optical signal.
A TSI near 48 places Lake Minnesuing in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. A maximum depth of 43 ft puts Lake Minnesuing in the middle of Wisconsin's depth distribution. The lake's 450 acres and partial shoreline records put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Lake Minnesuing ranks 18 of 40 in Douglas County — solidly in the upper half of the local distribution.
Lake Minnesuing has at least one documented invasive species (Chinese Mystery Snail), so boaters and anglers should observe clean-drain-dry steps when leaving the lake. The fishery includes walleye among the lake's 5 documented species — a notable draw for Wisconsin anglers. 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 2025-07-27. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 6.2 ft. Phosphorus level: 16.2 µg/L. Trophic State Index: 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.2 ft | D |
| Phosphorus | 16.2 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 43 ft |
| Surface Area | 450 acres |
Fish Species
Click a species to see all Wisconsin and Minnesota lakes where it is found.
→ Best fishing times for Lake Minnesuing (14-day solunar calendar)
→ Is it safe to eat fish from Lake Minnesuing? (mercury & PFAS guide)
→ Lake Minnesuing 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: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.335 m/yr | 5 |
| Phosphorus | ↑ Improving | -1.08 µg/L/yr | 6 |
Location
County Ranking
Ranked #18 of 40 lakes in Douglas County
Cleaner Lakes Within 30 Miles
Lake Minnesuing holds Grade B. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Douglas County
More Wisconsin Lake Rankings
State Parks Near Lake Minnesuing
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Compare Lake Minnesuing With Nearby Lakes
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1991. 5 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Lake Minnesuing covering fish populations, stocking, water quality, and management. 1 report on file.
- 2017Lake Minnesuing fishery assessment, 2017Fisheries Survey · WI DNR · 2017 (PDF)
EPA Impairment Status
Lake Minnesuing 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 WI10008906 · 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: 2025-07-27
Monitoring stations: 2