Freeway plan
increases runoff, paves over floodplain
Milwaukee County hit hardest
(Updated Nov. 23 to include information on grass ditch stormwater treatment.)
Nov. 21, 2007 -- The proposed $1.9 billion I-94 north-south expansion project would increase paved-over freeway land in the corridor by almost almost 50% in Milwaukee County, according to the draft Environmental Impact Statement for the project.
The amount of impervious I-94 freeway land would increase from 10.3 million square feet to 15.4 million square feet, a 49.7% increase, according to the EIS.
That is more than the combined pavement increases in Racine and Kenosha counties in Wisconsin and Lake County in Illinois, the other counties affected by the proposed expansion project.
"The amount of storm water runoff is expected to increase proportionately to the increase in impervious surface (that is, pavement)" according to the EIS.
The project overall would increase freeway-related pavement from 37 million square feet to 46.4 million square feet, a 25.4% increase.
Some of the Milwaukee
County land to be filled -- about 174,000 square feet -- is floodplain,
or land that is susceptible to flooding. Increasing the amount of land
that cannot absorb water raises flooding risks.
Runoff from the hard surfaces of freeways is generally highly contaminated.
Chemical pollutants from cars can poison water, vegetation and associated aquatic life.
The document does not specify the steps the state would take to reduce pollution from the increased runoff. It says most storm water quality control in Milwaukee County would be achieved through grass ditches near the freeway.
The EIS also does not specify any steps the state would take to reduce potential flooding.
The Milwaukee Metropolitan Sewerage District is involved in major, expensive flood control and water quality efforts in the Milwaukee area. MMSD spokesman Bill Graffin said district officials say WisDOT has not been in touch with them about the North-South project.
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