I suspected for quite some time that these three bridges just north of Bridalveil Falls were once highway spans. Turns out they were and in addition to that they were also the first reinforced concrete bridges Yosemite being constructed in 1913:
https://historicbridges.org/california/bridalveilfalls2/ca1639data.pdf
The bridges in question:
https://flic.kr/p/2r9DsGi
https://flic.kr/p/2r9JRue
https://flic.kr/p/2r9K53Q