California State Route 115 is a 35.24-mile State Highway located in Imperial Valley of Imperial County. California State Route 115 begins at California State Route 111 in Calipateria and ends at Interstate 8 east of Holtville. California State Route 115 first appeared on State Highway maps during 1956 over a segment of Legislative Route Number 187 and Legislative Route Number 201. California State Route 115 was realigned onto a bypass of Holtville during 1959 and originally had a southern terminus at Bonds Corner. During 1972 the southern terminus of California State Route 115 was shifted east of Holtville to Interstate 8.
https://www.gribblenation.org/2023/07/california-state-route-115.html?m=1
This is one of the strangest state highways. It has 2-3 distinct alignments and yet clinching it requires doing some very oddball turns when there are direct connections that are shorter, but not part of the route's definition.