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LakeQuality
A

Cedar Lake

Iron County, WisconsinOligotrophic

Cedar Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Iron County. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

The lake's low TSI puts it in oligotrophic territory — the cleanest of the four trophic classes, but also the most vulnerable to nutrient-driven shifts. The lake bottoms out at 21 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. Cedar Lake covers 187 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Cedar Lake ranks 7 of 34 in Iron County, putting it in the upper tier of locally monitored lakes.

No invasive species are currently listed at Cedar Lake — the lake remains off the Wisconsin infested-waters roster. The fishery includes walleye alongside the lake's other 6 documented species — a notable draw for Wisconsin anglers. A documented public access point at 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 2023-09-16. 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 24.8 ft down. Phosphorus level: 18.3 µg/L. Trophic State Index: 38.

MetricValueGrade
Water Clarity (Secchi Depth)24.8 ftA
Phosphorus18.3 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)38Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Maximum Depth21 ft
Surface Area187 acres
Public AccessYes

Fish Species

Click a species to see all Wisconsin and Minnesota lakes where it is found.

→ Best fishing times for Cedar Lake (14-day solunar calendar)

→ Is it safe to eat fish from Cedar Lake? (mercury & PFAS guide)

Cedar Lake fishing regulations (limits, seasons, special rules)

Water Quality Trend: Improving

Based on 3 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+0.314 m/yr3
Phosphorus Improving-1.56 µg/L/yr3
See year-by-year chart →

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #7 of 34 lakes in Iron County

Nearby Lakes in Iron County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2023).

Fish Species (DNR-rated)

Musky(Common)Panfish(Common)Northern Pike(Common)Walleye(Common)Largemouth Bass(Present)Smallmouth Bass(Present)

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: 2023-09-16

Monitoring stations: 1