Abstract: A span lock system for a double-leaf drawbridge. A guide housing mounted at the tip of one leaf includes an opening with vertically opposed cushioned shoes slidably supporting an elongate lock bar reciprocative lengthwise in a direction along the length of the drawbridge. A receiver housing mounted at the tip of the other leaf is positioned to interlock with the guide housing and includes a like opening slidably receiving the lock bar between vertically opposed cushioned shoes. A pair of vertical guide columns project from either side of the guide housings opening with the upper and lower edges of the distal sides beveled inwardly, and another pair of vertical guide columns project from the on either side of the receiver housing opening with the upper and lower edges of the proximal sides beveled outwardly.