State Historic Bridge Inventory and Evaluation (2024 Update)

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STATE HISTORIC BRIDGE INVENTORY AND EVALUATION 2024 UPDATE 2.0: BRIDGE IDENTIFICATION FEDERAL DEFINITION The Federal government defines a bridge as a structure erected over a depression or an obstruction with a track or passageway for carrying traffic or other moving loads, and having an opening measured along the center of the roadway of more than 20 feet between undercopings of abutments or springlines of arches (23 C.F.R. § 650.403). This definition is used as a criterion for eligibility to use Federal funds and includes all bridges that are inspected every two years. Due to this definition, HDOT does not maintain the same records for the bridges or culverts less than 20 feet. Pedestrian and other non-vehicular bridges were sometimes included in the inventory when listed on the National Bridge Inventory(NBI). Counties can opt to place a pedestrian bridge on the NBI to qualify for Federal funding. IDENTIFICATION OF BRIDGE COMPONENTS TOTAL BRIDGE LENGTH RAILING DECK LSUPERSTRUCTURE SPAN LENGTH SUBSTRUCTURE SUBSTRUCTURE (ABUTMENT) (PIER) FIGURE 1. BRIDGE COMPONENTS.SOURCE:MKE ASSOCIATES LLC,2013. SUMMARY OF BRIDGE TYPES IN HAWAII6 Bridge type is defined by the form or method in which the structure functions. It is not exclusively determined by any of the following: materials, method of connection, type of span, or if the bridge structure exists above or below the grade. 6 The following bridge descriptions are drawn from the following source: Parsons Brinckerhoff and Engineering and Industrial Heritage,A Context for Common Historic Bridge Types, NCHRP Project 25-25, Task 15, prepared for the National Cooperative Highway Research Program, Transportation Research Council, National Research Council (October 2005). o� 17