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LakeQuality
F

Bull Frog Lake

Cook County, WisconsinLimited DataEutrophic

Bull Frog Lake is a productive, nutrient-rich eutrophic lake in Cook County, IL. Water quality is graded F based on 1 sampling years through 2022. Compared to the 67 other monitored lakes in Cook County, Bull Frog Lake ranks #46 for water quality.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2022-03-21. Grade methodology: LakeGrade methodology.

Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

Very murky, less than 3 ft of visibility. Trophic State Index: 61.

MetricValueGrade
Water Clarity (Secchi Depth)3 ftF
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)61Eutrophic

High nutrients, frequent algae, reduced clarity

Location

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County Ranking

Ranked #46 of 68 lakes in Cook County

Cleaner Lakes Within 30 Miles

Bull Frog Lake holds Grade F. 3 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Cook County

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Powderhorn Lake
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Wampum Lake
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Lake Calumet
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More Wisconsin Lake Rankings

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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

All Wisconsin lakes

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Other Grade F Lakes in Wisconsin

Salem Lake

Marion County · Clarity: 1 ft

Lake Springfield

Sangamon County · Clarity: 1.5 ft

Vandalia Lake

Fayette County · Clarity: 1.3 ft

Holiday Shores Lake

Madison County · Clarity: 1.7 ft

Sam Dale Lake

Wayne County · Clarity: 1.2 ft

Raccoon Lake

Marion County · Clarity: 1.2 ft

Eutrophic Lakes in Wisconsin

Long LakeLake of EgyptVienna Correctional Center LakeOne Horse Gap Lake

Reservoir Info (USACE NID)

Bull Frog Lake is a man-made reservoir impounded by the Bullfrog Lake Dam (completed 1958), built primarily for recreation on the TRIB DES PLAINES RIVER; earth-type dam, 17 ft tall and 700 ft long.

Normal storage
77 ac-ft
Max storage
144 ac-ft
Hazard class
Significant
Owner
FOREST PRESERVE DISTRICT OF COOK COUNTY

Source: USACE National Inventory of Dams, NID ID IL00869 · Operator website

EPA Impairment Status

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

Causes of impairment

Algal growthNoxious aquatic plantsNutrients (phosphorus, nitrogen)Turbidity

Source: EPA ATTAINS assessment unit IL_RHZF · Official waterbody report

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: 2022-03-21

Monitoring stations: 1