[Code of Federal Regulations] [Title 23, Volume 1] [Revised as of April 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 23CFR661.27] [Page 325] TITLE 23--HIGHWAYS CHAPTER I--FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 661_INDIAN RESERVATION ROAD BRIDGE PROGRAM--Table of Contents Sec. 661.27 When is a bridge eligible for replacement? To be eligible for replacement, the bridge must be considered deficient for reasons of structural deficiency or functional obsolescence. Also, the bridge must have a sufficiency rating of less than 50 to be eligible for replacement.