Question 1

How clean is Big Creek Lake?

Accepted Answer

Big Creek Lake has very poor water quality and a high algae bloom risk. It received a water quality grade of F (Very Poor) based on EPA monitoring data. Water clarity (Secchi depth): 2.6 ft. Chlorophyll-a (algae): 35.7 µg/L. Trophic State Index: 64.

Question 2

What is the water clarity of Big Creek Lake?

Accepted Answer

Big Creek Lake has a Secchi depth (water clarity) of 2.6 feet. That is poor clarity, indicating heavy algae or sediment.

Question 3

Does Big Creek Lake have an algae problem?

Accepted Answer

Big Creek Lake has a chlorophyll-a (algae) level of 35.7 µg/L. That is high — the lake is at meaningful risk of harmful algal bloom advisories in summer.

Question 4

Is Big Creek Lake polluted?

Accepted Answer

Big Creek Lake shows pollution indicators consistent with nutrient over-enrichment (typically phosphorus from agricultural runoff, fertilizer, or failing septic systems). Its grade of F reflects elevated nutrient and algae levels.

Metric	Big Creek Lake	Wisconsin avg
Overall Grade	F	D
Water Clarity (Secchi)	2.6 ft	—
Chlorophyll-a (Algae)	35.7 µg/L	<10 = clean
Trophic State Index	64	<50 = clean

How Clean Is Big Creek Lake?

Cleanliness Snapshot

How does Big Creek Lake compare?

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