What is the water quality grade for Sugar Hollow Lake?

Sugar Hollow Lake in Warren County, Wisconsin received a water quality grade of D (Poor). Water clarity: 3.3 ft visibility. Phosphorus: 31.5 µg/L. Chlorophyll-a (algae): 14.7 µg/L. Surface area: 17 acres.

Is Sugar Hollow Lake safe to swim in?

Swimming not recommended, poor water quality with high algae risk. Sugar Hollow Lake has an overall water quality grade of D. Algae concentration (chlorophyll-a) is 14.7 µg/L. Always check local health department advisories before swimming.

Sugar Hollow Lake

Warren County, WisconsinEutrophic

Sugar Hollow Lake is a 17-acre productive, nutrient-rich eutrophic lake in Warren County, MO. Water quality is graded D based on 3 sampling years through 2024. Compared to the 15 other monitored lakes in Warren County, Sugar Hollow Lake ranks #14 for water quality.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-09-14. Grade methodology: LakeGrade methodology.

Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Very murky, less than 3.3 ft of visibility. Phosphorus level: 31.5 µg/L. Chlorophyll-a: 14.7 µg/L. Trophic State Index: 57.

Metric	Value	Grade
Water Clarity (Secchi Depth)	3.3 ft	F
Phosphorus	31.5 µg/L	C
Chlorophyll-a (Algae)	14.7 µg/L	C
Trophic State Index (TSI)	57	Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

Characteristic	Value
Surface Area	17 acres

Location

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County Ranking

Ranked #14 of 16 lakes in Warren County

Cleaner Lakes Within 30 Miles

Sugar Hollow Lake holds Grade D. 2 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Warren County

Sherwood Lake Nr. Dam

More Wisconsin Lake Rankings

Cleanest lakes in Wisconsin

Top 25 by overall water quality score

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Grade A/B + low algae filter

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Panfish-rich, public access

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Full state directory

Other Grade D Lakes in Wisconsin

Boathouse Lake

St. Louis city County · Clarity: 2.3 ft

Hunnewell Lake

Shelby County · Clarity: 3.2 ft

Long Branch Lk. Lake

Macon County · Clarity: 1.8 ft

Harrison County Lake Intake

Harrison County · Clarity: 1.7 ft

Table Rock L. Bl. Hwy. 173 Lake

Stone County · Clarity: 2.3 ft

Henry Sever Lake

Knox County · Clarity: 2.1 ft

Eutrophic Lakes in Wisconsin

Boathouse Lake Hunnewell Lake Long Branch Lk. Lake Creve Coeur Lake

Reservoir Info (USACE NID)

Sugar Hollow Lake is a man-made reservoir impounded by the Sugar Hollow Dam (completed 1968), built primarily for recreation on the TR-WOLF CREEK; earth-type dam, 43 ft tall and 420 ft long.

Surface area: 17 ac
Normal storage: 178 ac-ft
Max storage: 326 ac-ft
Drainage area: 1.52 sq mi
Hazard class: High
Owner: LAKE SHERWOOD ESTATES HOA

Source: USACE National Inventory of Dams, NID ID MO30522 · Operator website

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2024-09-14

Monitoring stations: 1