[Code of Federal Regulations]
[Title 23, Volume 1]
[Revised as of April 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 23CFR661.45]

[Page 343]
 
                           TITLE 23--HIGHWAYS
 
 CHAPTER I--FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
 
PART 661--INDIAN RESERVATION ROAD BRIDGE PROGRAM--Table of Contents
 
Sec. 661.45  How is a list of deficient bridges to be generated?

    (a) In consultation with the BIA, a list of deficient BIA IRR 
bridges will be developed each fiscal year by the FHWA based on the 
annual April update of the NBI. The NBI is based on data from the 
inspection of all bridges. Likewise, a list of non-BIA IRR bridges will 
be obtained from the NBI. These lists would form the basis for 
identifying bridges that would be considered potentially eligible for 
participation in the IRRBP. Two separate master bridge lists (one each 
for BIA and non-BIA IRR bridges) will be developed and will include, at 
a minimum, the following:
    (1) Sufficiency rating (SR);
    (2) Status (structurally deficient or functionally obsolete);
    (3) Average daily traffic (NBI item 29);
    (4) Detour length (NBI item 19); and
    (5) Truck average daily traffic (NBI item 109).
    (b) These lists would be provided by the FHWA to the BIADOT for 
publication and notification of affected BIA area offices, Indian tribal 
governments (ITG)s, and State and local governments.
    (c) BIA area offices in consultation with ITGs, are encouraged to 
prioritize the design for bridges that are structurally deficient over 
bridges that are simply functionally obsolete, since the former is more 
critical structurally than the latter. Bridges that have higher average 
daily traffic (ADT) should be considered before those that have lower 
ADT. Detour length should also be a factor in selection and submittal of 
bridges, with those having a higher detour length being of greater 
concern. Lastly, bridges with higher truck ADT should take precedence 
over those which have lower truck ADT. Other items of note should be 
whether school buses use the bridge and the types of trucks that may 
cross the bridge and the loads imposed.