identify the existing vertical clearance if the 4.1.4 Bridge Type Selection Report bridge is located over a road or railroad. Bridge Hydraulic Requirements. Indicate General the flood frequency used for design, type of The Bridge Type Selection Report is prepared opening (vertical or sloped), channel bottom by the consultant to identify potential structure width, slope pitch, and freeboard alternates for a particular site. In this report, requirements. each viable structure type is evaluated in terms of initial and long-term costs, constructability, Proposed Location and Alignment. Indicate serviceability, and adaptability and fit to the site. the new alignment in relation to structure’s Cost estimates are prepared for each alternative the existing alignment, if applicable. and a recommendation made for the preferred Mention if the horizontal alignment is structure type. located on a curve or tangent. Describe the vertical alignment (grades, vertical curve, crown, super transition). 4.1.4.2 Preparation and Distribution Bridge Configuration. Describe the The consultant prepares the Bridge Type following features of the proposed structure Selection Report for the Consultant Design and why selected: Engineer and the report is then distributed to the Bridge Engineer, District Administrator, Roadway Width Highways Design Engineer, and the Hydraulics Sidewalk requirements Engineer with comments requested. Structure Skew Proposed End and Intermediate Bent Type Format/Content Bridge rail Type Deck Geometry (crown, super, In general, the consultant will prepare the Bridge varying super) Type Selection Report in the sequence and Vertical clearance over highway or format discussed below. All subject areas may railroad not be required for each individual structure site. Deck Drainage Sufficient detail should be provided so the reader can understand the selection process. Right-of-Way. Identify if the proposed structure will require new right-of-way or Introduction. Briefly describe the purpose construction permits. of the report and the factors used in the selection of the preferred alternative. Utilities. Identify is utilities are located on the existing structure and if they are to be Existing Structure. If the project involved is accommodated on the new bridge. Describe a bridge replacement, describe the existing how they are to be attached. structure. Indicate overall width and length, span lengths, skew angle, superstructure, Structure Alternatives. List the structure substructure and foundation types. Also types considered for the site. For each,
4.1.4 Bridge Type Selection Report General The Bridge Type Selection Report is prepared by the consultant to identify potential structure alternates for a particular site. In this report, each viable structure type is evaluated in terms of initial and long-term costs, constructability, serviceability, and adaptability and fit to the site. Cost estimates are prepared for each alternative and a recommendation made for the preferred structure type. 4.1.4.2 Preparation and Distribution The consultant prepares the Bridge Type Selection Report for the Consultant Design Engineer and the report is then distributed to the Bridge Engineer, District Administrator, Highways Design Engineer, and the Hydraulics Engineer with comments requested. Format/Content In general, the consultant will prepare the Bridge Type Selection Report in the sequence and format discussed below. All subject areas may not be required for each individual structure site. Sufficient detail should be provided so the reader can understand the selection process. Introduction. Briefly describe the purpose of the report and the factors used in the selection of the preferred alternative. Existing Structure. If the project involved is a bridge replacement, describe the existing structure. Indicate overall width and length, span lengths, skew angle, superstructure, substructure and foundation types. Also identify the existing vertical clearance if the bridge is located over a road or railroad. Bridge Hydraulic Requirements. Indicate the flood frequency used for design, type of opening (vertical or sloped), channel bottom width, slope pitch, and freeboard requirements. Proposed Location and Alignment. Indicate the new structure’s alignment in relation to the existing alignment, if applicable. Mention if the horizontal alignment is located on a curve or tangent. Describe the vertical alignment (grades, vertical curve, crown, super transition). Bridge Configuration. Describe the following features of the proposed structure and why selected: Roadway Width Sidewalk requirements Structure Skew Proposed End and Intermediate Bent Type Bridge rail Type Deck Geometry (crown, super, varying super) Vertical clearance over highway or railroad Deck Drainage Right-of-Way. Identify if the proposed structure will require new right-of-way or construction permits. Utilities. Identify is utilities are located on the existing structure and if they are to be accommodated on the new bridge. Describe how they are to be attached. Structure Alternatives. List the structure types considered for the site. For each,
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