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2023 Docket Enabling Ordinance December 19, 2023 <br />Page 109 <br /> <br /> <br />H. All box culverts and bridges shall have the year of construction permanently indentured <br />on the downstream headwall face in legible numbers. The numbers shall be 3" high by 1- <br />1/2" wide by approximately 3/8" deep in the headwall face. <br />I. All bridge and major drainage structure designs must comply with WSDOT load rating <br />requirements and be stamped, signed, and dated by a registered professional structural <br />engineer. <br />J. All box culvert, pipe arch, structural plate culverts and bridge designs shall be done by a <br />registered professional structural engineer licensed in the state of Washington. The <br />complete design of the structure shall be submitted to the County Engineer for approval. <br />K. Any public or private structure defined as a bridge per WSDOT shall require the applicant <br />(and engineer) to submit a load rating analysis and scour analysis. All public structures <br />require completion and submittal of applicable WSDOT forms. <br />L. Foundation designs shall be based upon the recommendations of a qualified <br />geotechnical engineer and shall include a scour analysis for the protection of existing <br />streambed and footing elevations. These recommendations shall be documented in the <br />geotechnical report. <br />M. A new structure shall not create a backwater elevation rise of more than one foot. The <br />bottom of the superstructure of bridges shall be a minimum of three feet above the one- <br />hundred-year flood elevation. <br />N. Vehicular railing shall comply with AASHTO crash tested rail or approved crash tested <br />rail. <br />O. Pedestrian railing shall comply with AASHTO Standard Specifications for Highway <br />Bridges. <br />P. Bridge and major drainage structure waterway opening designs shall conform to the <br />parameters of the applicable WSDOT design manual, AASHTO design guidelines, and the <br />guidelines and regulations of any agency, such as the Washington Department of Fish <br />and Wildlife and Army Corps of Engineers.