3 Unknown Bridge Inspection Facts: Fact 1 - The Federal Highway Administration mandates that all U.S. bridges must be inspected at regular intervals not to exceed two years. Fact 2 - As of 1989, more than 40% of the nation's total (231,389 bridges), were judged deficient … [Read more...] about Underwater Inspection Design and Construction – The Castle Group – Part 1 Preparing for Inspection
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