t　has　been　proposed　that　0.7　in.　(17.8　mm)　diameter　prestressing　strand　be　permitted　for　use　in　bridge　girders.　If　0.6　in.　(15.2　mm)　diameter　strand　is　replaced　on　a　one-to-one　basis　with　0.7　in.　strand,　the　pretensioning　force　can　be　increased　by　35%.　When　designs　use　0.7　in.　strands　as　well　as　high　concrete　strengths,　longer-span　prestressed　concrete　girders　may　be　achieved.　An　extensive　analytical　study　is　presented　to　assess　the　maximum　girder　span　lengths　that　can　be　achieved　when　using　0.6　and　0.7　in.　strands.　A　parametric　design　study　with　584　cases　was　conducted　to　examine　the　influence　of　girder　shape　and　size　on　the　potential　benefits　of　using　0.7　in.　strands.　A　detailed　finite　element　analysis　of　some　of　the　longer　spans　achieved　was　also　conducted.　The　impacts　of　using　0.7　in.　strands　on　end-region　detailing　requirements,　prestress　transfer,　and　handling　and　erection　stability　of　long-span　girders　were　examined.　Girder　span　increases　of　up　to　22%　were　achieved　using　0.7　in.　strand　in　place　of　0.6　in.　strand.　The　larger　pretension　forces　affected　end-region　detailing　and　increased　congestion,　though　all　resulting　requirements　were　constructible.　The　longer　spans　affected　girder　stability　calculations,　and　some　girder　types　required　a　wider　top　flange　to　meet　stability-related　limit　states.　©　2023　Precast/Prestressed　Concrete　Institute.　All　rights　reserved.