Minnesota Public Radio slideshow:
Pollution cleanup cost is hard to comprehend
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Lake Calhoun in Minneapolis faced pollution problems in the 1980s. Chemical treatments were used in the lake to clean up phosphorous, and urban run off from surrounding neighborhoods was diverted to storm water ponds. Now the lake has seen an improvement in it's quality and clarity. (MPR Photo/Tim Post)

Lake Calhoun in Minneapolis faced pollution problems in the 1980s. Chemical treatments were used in the lake to clean up phosphorous, and urban run off from surrounding neighborhoods was diverted to storm water ponds. Now the lake has seen an improvement in it's quality and clarity.

(MPR Photo/Tim Post)
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