A system for monitoring the condition of a bridge includes:a video camera stably positioned at a selected distance from a bridge and having an unobstructed view of a selected portion of the bridge structure； and,a data processing system to analyze the output of the video camera over a selected time interval and calculate a physical parameter related to movement of the selected portion of said bridge structure as a function of time, and further including: a GUI that displays: a fixed image frame from the video camera, corresponding to a particular user-selected time within the time interval；an area selector, movable by the user to select a portion of the structure for analysis； and,a display of the physical parameter versus time for the selected portion over the selected time interval.The processor may perform some tasks, e.g., area selection, autonomously or via predetermined rules.
