C

Forest Lake Se Branch

Adair County, WisconsinEutrophic

Forest Lake Se Branch is a productive, nutrient-rich eutrophic lake in Adair County, MO. Water quality is graded C based on 3 sampling years through 2024. Compared to the 4 other monitored lakes in Adair County, Forest Lake Se Branch ranks #3 for water quality.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-09-18. Grade methodology: LakeGrade methodology.

Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Very murky, less than 2.3 ft of visibility. Phosphorus level: 25 µg/L. Chlorophyll-a: 9.3 µg/L. Trophic State Index: 56.

Metric	Value	Grade
Water Clarity (Secchi Depth)	2.3 ft	F
Phosphorus	25 µg/L	B
Chlorophyll-a (Algae)	9.3 µg/L	B
Trophic State Index (TSI)	56	Eutrophic

High nutrients, frequent algae, reduced clarity

Location

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County Ranking

Ranked #3 of 5 lakes in Adair County

Cleaner Lakes Within 30 Miles

Forest Lake Se Branch holds Grade C. 3 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Adair County

Hazel Creek Lk. Lake

Hazel Creek Lk. Lake

Hazel Creek Lk. East Fork Lake

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Other Grade C Lakes in Wisconsin

Aspen Lake Along Southern Arm

Warren County · Clarity: 3.8 ft

Mark Twain Lake by Hwy J

Ralls County · Clarity: 3.7 ft

Warren County · Clarity: 3.3 ft

Platte County · Clarity: 4.7 ft

Table Rock L. Nr. Greens Hollow Lake

Barry County · Clarity: 5 ft

Little Prairie Lake by Dam

Phelps County · Clarity: 4.9 ft

Eutrophic Lakes in Wisconsin

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

EPA Impairment Status

Forest Lake Se Branch is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).

Causes of impairment

Algal growthMercury

Source: EPA ATTAINS assessment unit MO_7151.00 · Official waterbody report · Matched by proximity (0.95 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: 2024-09-18

Monitoring stations: 1