25 CFR 170.504 - When and how are bridge inspections performed?
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IRR bridge inspections must be performed at least every 2 years to update the NBI using criteria that meets or exceeds applicable Federal standards (23 CFR 650.305).
(a) Federal standards for bridge inspections are found in 23 CFR part 650, subpart C.
Title 25 published on 2014-04-01
no entries appear in the Federal Register after this date.