The Lincoln Highway, the nation’s first east-west transcontinental highway, has a close history with Greene County. Stretching from New York City to San Francisco, it was originally built as a largely private promotional effort by the Lincoln Highway Association in 1913, with no federal help and very little from the state. Greene County was the first in the state to gravel its section and the first to pave it. The original route ran through Grand Junction, Jefferson, and Scranton. Several segments and structures in the county are listed on the National Register of Historic Places. In 1928, concrete markers were erected nationwide along the entire route on a single day by Boy Scouts, and several mark the route through Greene County. About 50 miles of hand-dug drain tile adjoin the highway through the county. West of Jefferson, the Eureka Bridge across the Raccoon River was built in 1912 and remains the only multiple-arch bridge of its type in rural Iowa.