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LakeQuality

Turtle Flambeau Flowage Lake vs Turtle-Flambeau Flowage Lake

Water quality, depth, fish species, and recreation comparison.

Turtle Flambeau Flowage Lake has a higher water quality grade (B, Good) than Turtle-Flambeau Flowage Lake (D, Poor). Both are in Iron County, Wisconsin.

Turtle Flambeau Flowage Lake and Turtle-Flambeau Flowage Lake are both in Wisconsin — a same-state head-to-head where the comparison comes down to lake-specific differences in depth, watershed, and monitoring history rather than the broader state-level water-quality regime. The grades are meaningfully apart: Turtle Flambeau Flowage Lake grades a B while Turtle-Flambeau Flowage Lake grades a D. That two-letter spread reflects real underlying differences — different watershed inputs, different depth profiles, or different monitoring rigor.

For a recreational visitor, the wider grade gap is decisive — Turtle Flambeau Flowage Lake is the better water-quality choice. For a researcher, the gap is the interesting part: what is different about the two watersheds, and which of those differences is mutable?

B

Turtle Flambeau Flowage Lake

Iron County, Wisconsin

Murky, only visible to about 6 ft.

D

Turtle-Flambeau Flowage Lake

Iron County, Wisconsin

Murky, only visible to about 4 ft.

Side-by-Side Metrics

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

MetricTurtle Flambeau Flowage LakeTurtle-Flambeau Flowage Lake
Overall GradeB (Good)D (Poor)
Water Clarity6 ft4 ft
Phosphorus19.7 µg/LNo data
Chlorophyll-a (Algae)No dataNo data
Maximum Depth--
Surface Area13.8K acres13.8K acres
Public AccessUnknownUnknown
Fish Species00
Trophic Statemesotrophiceutrophic

Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).

Verdict

Turtle Flambeau Flowage Lake wins on overall water quality with a Grade B versus Turtle-Flambeau Flowage Lake's Grade D. Water clarity: 6 ft vs 4 ft. For fishing diversity, Turtle Flambeau Flowage Lake also leads with 0 species.