Red Cedar Lake
Barron County, WisconsinMesotrophic
Red Cedar Lake earns an A — every scored parameter (clarity and phosphorus) rates among the best monitored waters in Barron County. clarity and phosphorus rate similarly, so there is no obvious single lever to pull on watershed management.
A TSI near 45 places Red Cedar Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. Red Cedar Lake is unusually deep for Wisconsin at 53 ft, which buffers the lake against summer warming and helps the deep water stay oxygenated. At 1,897 acres, Red Cedar Lake is one of the larger lakes in Barron County, with partial shoreline records supporting multiple distinct use patterns. Within Barron County's 37 graded waters, Red Cedar Lake sits at rank 3, near the top of the local distribution.
An invasive species record — Chinese Mystery Snail — has been logged at Red Cedar Lake; Wisconsin DNR maintains the official infested-waters list. Walleye are documented at Red Cedar 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 2025-09-22. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 10.1 ft. Phosphorus level: 17.4 µg/L. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.1 ft | B |
| Phosphorus | 17.4 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 53 ft |
| Surface Area | 1.9K acres |
Fish Species
Click a species to see all Wisconsin and Minnesota lakes where it is found.
→ Best fishing times for Red Cedar Lake (14-day solunar calendar)
→ Is it safe to eat fish from Red Cedar Lake? (mercury & PFAS guide)
→ Red Cedar 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 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -1.48 µg/L/yr | 2 |
Location
County Ranking
Ranked #3 of 37 lakes in Barron County
Nearby Lakes in Barron County
More Wisconsin Lake Rankings
Other Grade A Lakes in Wisconsin
Washington County · Clarity: 11.8 ft
Washington County · Clarity: 12.6 ft
Walworth County · Clarity: 11 ft
Waukesha County · Clarity: 11.3 ft
Walworth County · Clarity: 20.2 ft
Kenosha County · Clarity: 10 ft
Mesotrophic Lakes in Wisconsin
Compare Red Cedar Lake With Nearby Lakes
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 12 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Red Cedar Lake covering fish populations, stocking, water quality, and management. 1 report on file.
- 2023Red Cedar Chain of Lakes fisheries survey, 2023Fisheries Survey · WI DNR · 2023 (PDF)
EPA Impairment Status
Red Cedar Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5R).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10004632 · 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: 2025-09-22
Monitoring stations: 4