Abstract: A method for monitoring the condition of a bridge includes: stably positioning a video camera at a selected location with an unobstructed view of a selected portion of the bridge structure; collecting a video file of the structure over a selected total time interval; using a data processing system to analyze the video and calculate a physical parameter related to movement of the selected portion as a function of time, wherein the data processing system is controlled through a graphical user interface (GUI) having the following features: a display of a single video frame corresponding to a selected time; a movable area selector in the video frame to indicate the selection of an area of the structure for analysis; and, a display of displacement versus time for the selected area over the total time interval. The processor may perform some tasks, e.g., area selection, autonomously or via predetermined rules.