Townsend Flowage Lake

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

A TSI near 42 places Townsend Flowage Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. Townsend Flowage Lake covers 476 acres alongside partial shoreline records — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Among the 62 graded lakes in Oconto County, Townsend Flowage Lake sits at rank 18, above the county median.

No invasive species are currently listed at Townsend Flowage Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Townsend Flowage Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.