D

Sugar Creek Lake North Arm

Randolph County, WisconsinEutrophic

Sugar Creek Lake North Arm is a productive, nutrient-rich eutrophic lake in Randolph County, MO. Water quality is graded D based on 3 sampling years through 2024. Compared to the 6 other monitored lakes in Randolph County, Sugar Creek Lake North Arm ranks #7 for water quality.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-09-21. 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 1.6 ft of visibility. Phosphorus level: 71.3 µg/L. Chlorophyll-a: 24.1 µg/L. Trophic State Index: 66.

Metric	Value	Grade
Water Clarity (Secchi Depth)	1.6 ft	F
Phosphorus	71.3 µg/L	D
Chlorophyll-a (Algae)	24.1 µg/L	D
Trophic State Index (TSI)	66	Eutrophic

High nutrients, frequent algae, reduced clarity

Location

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County Ranking

Ranked #7 of 7 lakes in Randolph County

Cleaner Lakes Within 30 Miles

Sugar Creek Lake North Arm holds Grade D. 5 nearby lakes hold higher grades.

See full comparison →

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Other Grade D Lakes in Wisconsin

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Harrison County · Clarity: 1.7 ft

Table Rock L. Bl. Hwy. 173 Lake

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Henry Sever Lake

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Eutrophic Lakes in Wisconsin

Aspen Lake Along Southern Arm Boathouse Lake Hunnewell Lake Long Branch Lk. Lake

EPA Impairment Status

Sugar Creek Lake North Arm is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).

Causes of impairment

Mercury

Source: EPA ATTAINS assessment unit MO_7166.00 · Official waterbody report · Matched by proximity (0.97 km)

Data Sources

Water quality data from the EPA Water Quality Portal

Impairment status from EPA ATTAINS 303(d) database

Grading methodology based on Metropolitan Council standards

Most recent sample: 2024-09-21

Monitoring stations: 1