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LakeQuality
D

Monee Lake

Will County, WisconsinEutrophic

Monee Lake is a productive, nutrient-rich eutrophic lake in Will County, IL. Water quality is graded D based on 2 sampling years through 2022.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2022-10-27. 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. Phosphorus level: 128 µg/L. Trophic State Index: 64.

MetricValueGrade
Water Clarity (Secchi Depth)4.9 ftD
Phosphorus128 µg/LF
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)64Eutrophic

High nutrients, frequent algae, reduced clarity

Location

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County Ranking

Ranked #1 of 1 lakes in Will County

Cleaner Lakes Within 30 Miles

Monee Lake holds Grade D. 4 nearby lakes hold higher grades.

See full comparison →

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Other Grade D Lakes in Wisconsin

Lake Opeka

Cook County · Clarity: 4 ft

Consumers Quarry Lake

Cook County · Clarity: 6.5 ft

Lake Arlington

Cook County · Clarity: 4.5 ft

Great Lakes Quarries East

Cook County · Clarity: 4.5 ft

Flatfoot Lake

Cook County · Clarity: 6 ft

Papoose Lake

Cook County · Clarity: 5 ft

Eutrophic Lakes in Wisconsin

Lake OpekaConsumers Quarry LakeLake CharlemagneLake Arlington

Reservoir Info (USACE NID)

Monee Lake is a man-made reservoir impounded by the Monee Reservoir Dam (completed 1900), built primarily for recreation on the TRIB ROCK CREEK; earth-type dam, 29 ft tall and 2,400 ft long.

Normal storage
320 ac-ft
Max storage
650 ac-ft
Hazard class
Significant
Owner
FOREST PRESERVE DISTRICT OF WILL COUNTY

Source: USACE National Inventory of Dams, NID ID IL00566 · Operator website

EPA Impairment Status

Monee Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

MercuryNutrients (phosphorus, nitrogen)Pesticides

Source: EPA ATTAINS assessment unit IL_RFH · Official waterbody report · Matched by proximity (0.05 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: 2022-10-27

Monitoring stations: 3