What is the water quality grade for Epping-Springbrook Dam-Deepest Lake?

Epping-Springbrook Dam-Deepest Lake in Williams County, Wisconsin received a water quality grade of D (Poor). Water clarity: 4.9 ft visibility. Chlorophyll-a (algae): 21.3 µg/L. Surface area: 148 acres.

Is Epping-Springbrook Dam-Deepest Lake safe to swim in?

Swimming not recommended, poor water quality with high algae risk. Epping-Springbrook Dam-Deepest Lake has an overall water quality grade of D. Algae concentration (chlorophyll-a) is 21.3 µg/L. Always check local health department advisories before swimming.

Epping-Springbrook Dam-Deepest Lake

Williams County, WisconsinEutrophic

Epping-Springbrook Dam-Deepest Lake is a 148-acre productive, nutrient-rich eutrophic lake in Williams County, ND. Water quality is graded D based on 2 sampling years through 2025. Compared to the 8 other monitored lakes in Williams County, Epping-Springbrook Dam-Deepest Lake ranks #8 for water quality.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2025-10-28. Grade methodology: LakeGrade methodology.

Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Murky, only visible to about 4.9 ft. Chlorophyll-a: 21.3 µg/L. Trophic State Index: 57.

Metric	Value	Grade
Water Clarity (Secchi Depth)	4.9 ft	D
Phosphorus	No data
Chlorophyll-a (Algae)	21.3 µg/L	D
Trophic State Index (TSI)	57	Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

Characteristic	Value
Surface Area	148 acres

Location

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County Ranking

Ranked #8 of 9 lakes in Williams County

Cleaner Lakes Within 30 Miles

Epping-Springbrook Dam-Deepest Lake holds Grade D. 5 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Williams County

Epping-Springbrook Dam-Littoral Lake

Epping-Springbrook Dam-S Inlet Lake

Williams County

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Other Grade D Lakes in Wisconsin

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Ramsey County · Clarity: 2.9 ft

Lake Laretta

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Sweetwater Lake

Ramsey County · Clarity: 2.9 ft

Eutrophic Lakes in Wisconsin

Lake Alice J. Clark Salyer Pool 357 E. A. Patterson Lake Lake Irvine

Reservoir Info (USACE NID)

Epping-Springbrook Dam-Deepest Lake is a man-made reservoir impounded by the Epping Dam (completed 1935), built primarily for recreation on the Stony Creek; earth-type dam, 56 ft tall and 1,000 ft long.

Surface area: 148 ac
Normal storage: 1,560 ac-ft
Max storage: 3,890 ac-ft
Drainage area: 72.9 sq mi
Hazard class: Significant
Owner: Williams County WRB

Source: USACE National Inventory of Dams, NID ID ND00249 · Operator website · Matched by proximity (0.17 km)

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-10-28

Monitoring stations: 1