 This stretch through the Arbuckles was particularly expensive and difficult to construct, taking almost two years and requiring the blasting and removal of 4 million cubic yards of rock.A few months later in January, 1971, I-35 was finally completed across the state of Oklahoma, when the remaining portions of the interstate from Purcell to SH-7 near Davis were opened to traffic.In 2008, the Oklahoma Department of Transportation announced plans to widen of Interstate 35 through Norman, from the Main Street interchange to the McCall Bridge over the South Canadian River (Exit 109).