bascule bridge
moveable bridge using a counterweight to balance a span through its upward swing to let boats move underneath
en-US/ˈbæskjul ˈbɹɪd͡ʒ/
en-GB/ˈbæskjuːl ˈbɹɪd͡ʒ/
moveable bridge using a counterweight to balance a span through its upward swing to let boats move underneath