Goodwiler Lake

Goodwiler Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. Secchi readings are the weakest of the scored parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

At a TSI of 54, Goodwiler Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. A maximum depth of just 5 ft means sediment-bound phosphorus releases back into the water column whenever wind stirs the bottom — a classic shallow-lake dynamic. At 23 acres, Goodwiler Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Among the 6 graded lakes in Iowa County, Goodwiler Lake sits at rank 2, above the county median.

An invasive species record — Curly-Leaf Pondweed — has been logged at Goodwiler Lake; Wisconsin DNR maintains the official infested-waters list. The fishery is bass-led, with 3 documented species across the lake's records. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.