This park was once part of a limestone quarry operated by the Milwaukee Falls Lime Company, incorporated in 1890. Five vertical stone kilns lined with firebrick were built on the site to burn limestone from the quarry into quicklime, with timbers reinforced by nuts threaded onto long steel rods through the structures. Fueled with cordwood, the kilns reached temperatures from 1,400 to 2,000 degrees Fahrenheit, converting calcium carbonate to calcium oxide or lime, which when mixed with water was widely used in construction and for tanning hides. Mules pulled trams of limestone from the quarries to the crusher, then cables pulled them on tracks atop the kilns, which were stoked in fireboxes below; after dehydration, the limestone was pounded into a fine powder used for plaster, mortar, fertilizer, and white wash. A spur line carried the processed lime to the old Wisconsin Central Railway for shipment to Milwaukee, Chicago, St. Louis, and Detroit. By the spring of 1901, the Milwaukee Falls Lime Co. employed 50 men and shipped 5 to 6 train car loads of lime per day, but the kilns stopped operating in the 1920's. Three remaining kilns were restored many years later and stand as reminders of Grafton's industrial activity in the late 19th and early 20th centuries. In 1888, an iron truss bridge built by the Wisconsin Bridge and Iron Co. of Wauwatosa crossed the Milwaukee River at Bridge Street, replacing an earlier wooden bridge and preserving the village's only access from the east. For many years it served as the main entrance into Grafton and remained the only way across the river there until 1928, when a new concrete bridge on Washington St. was built to handle increased car and truck traffic. The bridge consists of seven modules, with a triangular module on each end and five rectangular modules between them with diagonal tension rods, and its riveted assembly bears a cast iron sign reading "1888 BUILDERS WISCONSIN BRIDGE & IRON CO. WAUWATOSA WIS." With a deck of heavy wooden planks, it was single lane for horse-drawn wagons, with tension rods along each side below deck level. After being moved from its original Bridge Street location, the entire bridge was coated with aluminum paint, and in 1996 it was relocated to Lime Kiln Park when a concrete bridge replaced it. It is one of the few remaining steel truss bridges in Wisconsin.