Red Cedar Lake
Barron County, WisconsinOligotrophic
Red Cedar Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Barron County. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.
Trophically, Red Cedar Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. 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 38 graded waters, Red Cedar Lake sits at rank 7, 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. A documented public access point at Red Cedar Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. 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 2025-09-22. Grade methodology: LakeGrade methodology.
Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 32.8 ft down. Phosphorus level: 17.4 µg/L. Trophic State Index: 36.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 32.8 ft | A |
| Phosphorus | 17.4 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 36 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 53 ft |
| Surface Area | 1.9K acres |
| Public Access | Yes |
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 Species
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.5 m/yr | 2 |
| Phosphorus | ↑ Improving | -1.48 µg/L/yr | 2 |
Recreation & Access
Location
County Ranking
Ranked #7 of 38 lakes in Barron County
Nearby Lakes in Barron County
More Wisconsin Lake Rankings
Other Grade A Lakes in Wisconsin
Waukesha County · Clarity: 14.6 ft
Waukesha County · Clarity: 13.8 ft
Walworth County · Clarity: 19 ft
Washington County · Clarity: 12 ft
Kenosha County · Clarity: 10.1 ft
Washington County · Clarity: 12.5 ft
Oligotrophic Lakes in Wisconsin
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)
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Fish and recreation data from Wisconsin DNR Lakes
Most recent sample: 2025-09-22
Monitoring stations: 4