What is the water quality grade for Giltners Lake?

Giltners Lake in Fond du Lac County, Wisconsin received a water quality grade of F (Very Poor). Phosphorus: 159.5 µg/L. Maximum depth: 13 ft. Surface area: 16 acres.

Is Giltners Lake safe to swim in?

Avoid swimming, very poor water quality, potential algae toxins. Giltners Lake has an overall water quality grade of F. Always check local health department advisories before swimming.

How deep is Giltners Lake?

Giltners Lake has a maximum depth of 13 feet. The lake covers 16 acres.

What fish are in Giltners Lake?

Fish species found in Giltners Lake include Panfish, Northern Pike. Giltners Lake is located in Fond du Lac County, Wisconsin.

Giltners Lake

Fond du Lac County, WisconsinLimited DataHypereutrophic

Giltners Lake grades an F: every scored parameter (phosphorus) rates poorly, placing it among the most stressed lakes monitored in Wisconsin.

Hypereutrophic conditions mean the lake is operating at the upper end of the productivity scale, with all the bloom risk that implies. A maximum depth of just 13 ft means sediment-bound phosphorus releases back into the water column whenever wind stirs the bottom — a classic shallow-lake dynamic. The lake is compact at 16 acres, with partial shoreline records and little volume to buffer nutrient inputs. Giltners Lake ranks 10 of 10 in Fond du Lac County — at the lower end of the locally monitored distribution.

No invasive species are currently listed at Giltners Lake — the lake remains off the Wisconsin infested-waters roster. The lake's fish records list 2 species — a varied community without one dominant gamefish. 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.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-09-09. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated May 31, 2026