with reference to the second terminal mentioned previously, is that place a city, town or a county?
City.
Blythe, California
Blythe is a city in eastern Riverside County, California, United States. 
what is california state route 78? It is a state highway in the U.S. state of California. what are the two terminals? Oceanside and Blythe. in which year did it begin construction? UNANSWERABLE what is the total length of it? UNANSWERABLE
wiki:25174860
Blythe, California [SEP] Introduction
Blythe is a city in eastern Riverside County, California, United States. It is in the Palo Verde Valley of the Lower Colorado River Valley region, an agricultural area and part of the Colorado Desert along the Colorado River, approximately east of Los Angeles and west of Phoenix. Blythe was named after Thomas Henry Blythe, a San Francisco financier, who established primary water rights to the Colorado River in the region in 1877. The city was incorporated on July 21, 1916. The population was 20,817 at the 2010 census.