 The Glamis road opened in August 1958 , and the road from Glamis to Palo Verde was under construction at that time ; the part of the road that was already open was dedicated in October . In 1959 , the rest of the current routing of SR 78 between Brawley and Palo Verde was added to the state highway system as SR 195 and Legislative Route 146 . The state legislature added the portion of SR 78 from SR 115 to the Riverside County line in the 1964 state highway renumbering , also naming the road the Ben Hulse Highway . In March 1964 , the Ben Hulse Highway leading to Palo Verde was dedicated , and state senator Hulse 's efforts to have the road built were recognized . Following this , in 1965 , the newly constructed section was signed as CR S78 . The section from Palo Verde to Blythe shows up as part of SR 78 on maps as early as 1965 , and the section from southwest of Midway Well to Palo Verde is shown as part of SR 78 as early as 1966 . 
