The Iowa Dept. of Transportation has proposed a five-year, $3.6-billion transportation plan, more than half of which would be devoted to road and bridge projects. Many projects would be in rural areas. If the state’s transportation commission approves the plan in June, major projects would advance, including replacement of the Interstate-74 bridge between Bettendorf, Iowa, and Moline, Ill., and the Black Hawk Bridge, a 90-year-old cantilever through-truss structure in northeast Iowa. Other projects include reconstructing the I-29/80/480 system in Council Bluffs, a new I-80/380 interchange near Iowa City and continued widening of I-35 in the Des Moines-Ames corridor to six lanes. Iowa’s proposed plan also allocates funds for facility and airside improvements at numerous airports.