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C

Chippewa Flowage -Moore'S Bay Lake

Sawyer County, WisconsinEutrophic

Chippewa Flowage -Moore'S Bay Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. The lake's weakest score is on Secchi depth — the water looks more turbid than its phosphorus number alone would predict.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. Chippewa Flowage -Moore'S Bay Lake is unusually deep for Wisconsin at 92 ft, which buffers the lake against summer warming and helps the deep water stay oxygenated. At 14,593 acres, Chippewa Flowage -Moore'S Bay Lake is one of the larger lakes in Sawyer County, with partial shoreline records supporting multiple distinct use patterns. Within the 50 graded lakes of Sawyer County, Chippewa Flowage -Moore'S Bay Lake sits at rank 42, near the bottom of the county list.

Eurasian watermilfoil is established at Chippewa Flowage -Moore'S Bay Lake, which can dampen recreational access and pressure the native plant community. The fishery includes walleye among the lake's 8 documented species — a notable draw for Wisconsin anglers. The grade is supported by multiple sampling years from the Wisconsin DNR Citizen Lake Monitoring Network, giving the letter a reasonably stable foundation.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2024-09-12. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 4.1 ft. Phosphorus level: 40 µg/L. Chlorophyll-a: 8.1 µg/L. Trophic State Index: 55.

MetricValueGrade
Water Clarity (Secchi Depth)4.1 ftD
Phosphorus40 µg/LC
Chlorophyll-a (Algae)8.1 µg/LB
Trophic State Index (TSI)55Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Maximum Depth92 ft
Surface Area14.6K acres

Fish Species

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

→ Best fishing times for Chippewa Flowage -Moore'S Bay Lake (14-day solunar calendar)

→ Is it safe to eat fish from Chippewa Flowage -Moore'S Bay Lake? (mercury & PFAS guide)

Chippewa Flowage -Moore'S Bay 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.

Chinese Mystery SnailEurasian Water-MilfoilPurple Loosestrife

Water Quality Trend: Improving

Based on 4 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+0.316 m/yr4
Phosphorus Declining+5.75 µg/L/yr2
Chlorophyll-a Improving-0.9 µg/L/yr2
See year-by-year chart →

Location

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County Ranking

Ranked #42 of 50 lakes in Sawyer County

Cleaner Lakes Within 30 Miles

Chippewa Flowage -Moore'S Bay Lake holds Grade C. 5 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Sawyer County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 9 stations on file (most recent sample 2020).

Fish Species (DNR-rated)

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

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2024-09-12

Monitoring stations: 1