Mead Lake Nb Test Site
Clark County, WisconsinLimited DataEutrophic
On the LakeGrade rubric Mead Lake Nb Test Site fails the cutoffs — a TSI of 67 and persistent algal pressure put it in the bottom tier.
Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. Mead Lake Nb Test Site reaches 16 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. Mead Lake Nb Test Site covers 310 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Mead Lake Nb Test Site sits at rank 3 of 4 in Clark County, in the lower half of the local distribution.
Mead Lake Nb Test Site has at least one documented invasive species (Curly-Leaf Pondweed), 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. 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 2025-09-28. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 2 ft of visibility. Trophic State Index: 67.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 67 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 16 ft |
| Surface Area | 310 acres |
Fish Species
Click a species to see all Wisconsin and Minnesota lakes where it is found.
→ Best fishing times for Mead Lake Nb Test Site (14-day solunar calendar)
→ Is it safe to eat fish from Mead Lake Nb Test Site? (mercury & PFAS guide)
→ Mead Lake Nb Test Site 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 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.114 m/yr | 4 |
| Phosphorus | ↑ Improving | -36.5 µg/L/yr | 3 |
Location
County Ranking
Ranked #3 of 4 lakes in Clark County
Cleaner Lakes Within 30 Miles
Mead Lake Nb Test Site holds Grade F. 2 nearby lakes hold higher grades.
Nearby Lakes in Clark County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1996. 6 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
EPA Impairment Status
Mead Lake Nb Test Site is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit WI10004701 · Official waterbody report · Matched by proximity (0.43 km)
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: 2025-09-28
Monitoring stations: 1