The Madison Redevelopment Commission voted Wednesday to amend its work plan to add a $200,000 allocation toward the cost of a study of potential routes to and from the new bridge.

The vote started a process that will include a public hearing, a recommendation from the Plan Commission and a vote by the City Council.

The study would cost $300,000 to $400,000, Mike Flint, a consultant who is spearheading the approach project, told the commission, which is also called the TIF Board.

The rest of the money, he said, will come from the state, which he said will put in $40,000 but would not identify which agency except to say it is not the Indiana Department of Transportation; and "other groups and sources."

The study will be an environmental impact statement, which the National Environmental Policy Act says is required for "major federal actions that significantly affect the quality of the human environment."

The environmental impact statement will study five alternative routes that a consultant working for INDOT identified in 2010. A memo Flint gave to commissioners listed the alternatives by number and didn't include the details of what each encompassed. The details will be published Friday.

"There's a lot of interest in making this an entrance to the state, not just an approach," Flint told the commission members.

All five of the alternatives would have an adverse effect on Madison's National Historic Landmark status, according to a chart in the memo.

Two to six businesses, three to seven homes and parts of 17 to 24 properties would be taken if one of the five alternatives is chosen, according to the chart.

One to five of the structures that would be displaced are in the National Historic Landmark District, and one is outside it, according to the chart.

The estimated total cost, including construction, right of way, utilities relocation and design ranges from $2.95 million to $13.36 million, depending on which alternative was chosen.

The least expensive alternative would displace two businesses and three residences, including two structures in the National Landmark district.

The alternative in which the most structures in the historic district would be displaced and the most partial parcels of property would be taken is the second-least expensive.

Mayor Damon Welch, who was at the TIF Board meeting, said Flint has already had private meetings with owners of historic properties in the area.

The TIF Board has rescheduled its next meeting. The board will meet at 3 p.m. Wednesday, Nov. 14 at City Hall, which is a week earlier than its regular meeting date.

The TIF Board collects a property tax in its tax increment financing zone on the hilltop. It pays cash for everything, but any projects it finances must first be in its printed work plan.