Williamsport Falls, near the center of Williamsport, Indiana, is the state's tallest waterfall at about 90 feet. Formed where Fall Branch passes through town, it separates the older riverside section from the newer area that developed after the railroad arrived. The water drops over a sandstone ledge near Monroe Street and the railroad crossing, and that ledge has slowly changed as rock has broken away, causing the height to vary over time. Sandstone below the falls was quarried for local building foundations, and in the 19th century the stream powered a mill. Today, flow is often reduced because farmland expansion and water impoundments have diverted natural runoff.