CFR > Title 25 - Indians > CHAPTER I—BUREAU OF INDIAN AFFAIRS, DEPARTMENT OF THE INTERIOR > SUBCHAPTER H—LAND AND WATER (parts 150 to 183) > PART 170—INDIAN RESERVATION ROADS PROGRAM > SUBPART D—Planning, Design, and Construction of Indian Reservation Roads Program Facilities (§170.400 to §170.507) > 170.504—When and how are bridge inspections performed?

170.504—When and how are bridge inspections performed?

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.
(b) Tribes may develop alternative bridge inspection standards, provided that these standards meet or exceed applicable Federal standards.