Rapidly deployable gap-crossing technologies composed of lightweight latticed modules arranged longitudinally to form a girder-type bridge (i.e. Callender-Hamilton, Bailey, Medium Girder, Acrow, and Mabey-Johnson systems) are effective short-term solutions to increasingly common natural and anthropogenic disaster-induced infrastructure collapse. However, their spans cannot exceed 210 ft, making them ineffective at addressing long-term recovery in regions isolated by larger gaps and creating an urgent need for ``transitional bridging" (a methodology that adapts deployable bridge components to longer-span solutions). This thesis provides a proof of concept for transitional bridges. First, three efficient forms for an approximately 300 ft span transitional bridge structure are determined. Finite element models of these forms are then analyzed under current American Association of State Highway and Transportation Officials (AASHTO) criteria. An impact analysis comparing transitional forms to both a steel and concrete girder bridge of comparable length is completed, supporting the claim that transitional forms compare well to conventional construction practices.