High Quality Content by WIKIPEDIA articles! Interstate 10 (I-10) is the southernmost transcontinental highway in the Interstate Highway System of the United States. It stretches from the Pacific Ocean at State Route 1 (Pacific Coast Highway) in Santa Monica, California to Interstate 95 in Jacksonville, Florida. The freeway is part of the original Interstate Highway plans designated in 1956 with its final section completed in 1990. Over one third of the length of I-10 resides in the state of Texas where the freeway spans the state at its widest points.