direct route to New Mexico. For a short time, the National Old Trails Road was partnered with a local auto trail known as the Ocean-to-Ocean Highway, which acted as an alternate route going from the National Old Trails Road to Phoenix and Yuma. Disagreements soon arose between the managers of both highways. The National Old Trails Highway Association preferred the main route be the highway to Topock, while the Ocean-to-Ocean Transcontinental Highway Association preferred the route to Yuma. Both organizations eventually ended their partnership and went in opposite directions. In the early days, National Old Trails Road traffic crossing the river utilized a ferry crossing between Topock and Needles on the California side of the river. The ferry, established in 1890, was used until 1914, when a river flood destroyed it. In response, the upstream Red Rock Bridge, owned by the Santa Fe Railway, became the new river crossing for National Old Trails Road motorists. The railroad had allowed cars to use the bridge so long as the drivers were willing to pay a toll. Construction started on the Old Trails Bridge, a dedicated automobile bridge, on June 30, 1915, and was completed several months later on February 20, 1916. The bridge was paid for by the states of California and Arizona as well as the Bureau of Indian Affairs at a cost of $75,000 (equivalent to $ in ). The bridge itself was a steel arch structure designed by San Bernardino County surveyor S. A. Sourwine. Once construction on the Old Trails Bridge had been completed, National Old Trails Road traffic was moved onto the new bridge and the Red Rock Bridge became train only once again. From 1916 to 1928, the Old Trails Bridge held the record of being the longest three-hinged arch bridge in the United States. Between 1915 and 1922, the National Old Trails Highway was surfaced with gravel between Topock and Oatman as well as between Seligman and Holbrook. A small section just outside Ash Fork was also reconstructed and realigned at this time, becoming the first road to ever be paved using volcanic cinders. The highway was also paved through Flagstaff in 1921 using concrete. In 1921, the Arizona state highway system was reorganized again following the passage of the Federal Aid Highway Act of 1921. The state no longer referred to the National Old Trails Road as the Santa Fe Highway, and instead