Only four noise barriers are recommended for the proposed new six-lane Interstate 74 corridor, despite the identification of 11 locations where the increased traffic sounds are expected to exceed federal noise abatement criteria.
The noise impacts and recommended list of four projects are contained in the Final Environmental Impact Statement issued for the project last month.
Seven of the 11 noise abatement projects were not recommended because they were deemed "economically unjustified" based on the number of residences currently adjacent to the roadway.
The four noise barriers recommended for construction in the impact statement are:
• Southwest of the Middle Road, Iowa, interchange adjacent to two apartment buildings. The 14-foot barrier would be 1,806 feet long and cost an estimated $110,000.
• East of I-74 and north of Lincoln Road, Iowa, adjacent to an apartment complex. The 8- to 16-foot barrier would be 500 feet long and cost an estimated $204,000.