The differences in costs for an approach to and from the Madison-Milton bridge hinge on how traffic would be moved between the bridge and State Road 56, or Main Street.

When a consultant for the Indiana Department of Transportation looked at possible approaches two years ago, the least expensive alternative would have been to use the same route as was used before traffic was rerouted off Harrison Street during bridge construction. The difference would be softening of the corners at Harrison and East Second streets, Second and Baltimore streets, and Baltimore and Main streets.

To do that, five properties would be displaced: two houses listed as contributing to Madison's National Historic Landmark status at 701 E. Second St. and 614 E. Main St.; two commercial properties, 822 E. First St. and 150 Harrison St., that have no historic status; and a long-vacant house at 902 Fillmore St. next to the east side of Harrison Street that is outside the National Historic Landmark area but is listed as contributing to the historic district.

The other four options would have a new connection to State Road 56. Alternative 2 would have a street parallel to Harrison that would curve east just north of First Street and be built on an earthen embankment to reach the higher elevation of State Road 56 just west of the current intersection of State Road 56 and Second Street. Second Street would end in a cul de sac where Fillin' Station Liquors is now.

In Alternative 3, the pavement at the bridge abutment would make a large curve to the west and connect to State Road 56 between Second Street and Roosevelt Street.

Alternative 4 would be similar to Alternative 3, but would be elevated on an earthen embankment. Second Street would pass beneath an overpass

Alternative 5, the most expensive, would have an overpass - longer than the one in Alternative 4 - just north of First Street to the connection to State Road 56 at a T-intersection. Second Street would go under the overpass.

Each of the alternatives would result in the removal of houses listed as contributing to Madison's National Historic Landmark district, which encompasses downtown.

The first step for an approach will be an environmental impact statement that could take a couple of years and cost up to $400,000.

Some properties would be impacted by one of the alternatives, while others would be removed if any of the five options was chosen. The properties and how they would be affected are:

• The commercial property at 822 E. First St. would be displaced in Alternatives 1, 2, 5.

• The commercial property at 150 Harrison St. would be displaced in Alternatives 2, 3, 4 and 5, as would a residential property at 210 Harrison St.; Fillin' Station Liquors at 901 E. Second St.; Hudson Auto Sales at 902 E. Second St.; and A-Z Lawn and Garden Equipment at 114 Sering St.

• The commercial property at 202 Harrison St. would be displaced in Alternatives 2, 3, 4 and 5 as well as No. 1.

• Residential property at 904 E. Second would be displaced in Alternatives 2, 3 and 4, as would residential property at 906 E. Second St. and residential property at 116 Sering St.

• Residential properties at 910 E. Second St. and 118 Sering St. would be displaced in Alternative 2.

• A residential property at 903 E. First St. would be displaced in Alternative 4.

• A residential property at 819 E. First St. would be displaced in Alternative 5.