Recognized as a leader in accelerated bridge
construction (ABC), Iowa’s Department of Transportation
(IDOT) was asked to partner with HNTB
Corporation to demonstrate the viability of a
high-performance ABC concept being developed
as a standard for nationwide use. The project
included the replacement of the Keg Creek Bridge
on U.S. 6 in Pottawattamie County, Iowa. The
bridge, a steel/precast modular structure 47' wide
and 210' long, would be completely replaced in a
two-week traffic-closure period. Normally, such
an undertaking would require complete or partial
road closure for a period of months.