In response to a congressional request, GAO reviewed the Zilwaukee
Bridge Project to: (1) determine whether the testing program that
the Michigan Department of Transportation (MDOT) implemented
confirmed that the bridge was structurally sound; (2) identify
construction problems causing concerns about the bridge and
determine whether they would affect its ability to perform as
designed; and (3) assess the MDOT draft bridge maintenance manual.
GAO found that: (1) the tests indicated that the Zilwaukee Bridge
had performed as designed and that the concrete exceeded design
requirements for strength and durability; (2) repairs made after a
1982 construction accident fully restored the damaged areas of the
bridge; (3) concrete spalling and cracking did not affect the
bridge's ability to perform as designed; (4) MDOT took corrective
action to ensure proper bonding of all areas with a concrete
overlay; and (5) although an independent panel's review of the
maintenance manual concluded that the manual was generally well
prepared, it recommended several changes that, if followed, would
provide for more adequate future maintenance.
General
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