2011 Top 10 Bridges - No. 9
PROJECT: I-270 Over Dorsett Road
LOCATION: Maryland Heights, Mo.
COST: $10 million
LENGTH: 2,232 ft
DESIGNER: HDR Inc.
CONTRACTOR: Fred Weber Inc.
OWNER: Missouri DOT
They were counting the days in Maryland Heights, Mo. Using the diverging diamond interchange con?guration, a ?rst in the St. Louis region, crews constructed two bridges, one at a time, in just 56 days on Missouri’s busiest section of highway. During construction of bridge one, there was just 4 ft of space between the bridge to be demolished and the adjacent temporary bridge.