bascule bridges
Bridges in which sections of the span are pivoted upward by use of counterweights. For bridges whose sections are pivoted upward by chains, cables, or other ropelike devices, use "drawbridges.".
Bridges in which sections of the span are pivoted upward by use of counterweights. For bridges whose sections are pivoted upward by chains, cables, or other ropelike devices, use "drawbridges.".
