The segment from the Alpine/Mono County line to the junction of Route 89 and Route 4 is named the "Robert M. Jackson Memorial Highway". This segment was named in memory of Robert M. Jackson, who was born in Sacramento, California on September 21, 1912. His family moved to Markleeville in Alpine County when he was two weeks old and remained there until 1924 when they moved to Los Angeles County. Robert M. Jackson returned every summer to Alpine county to work at the historic Alpine Hotel. In 1942 Robert M. Jackson enlisted in the United States Army Air Corps. He was stationed in Texas, Brazil, and finally in the Ascension Islands. After being discharged in 1945, he returned to Markleeville where he built the home he lived in for the rest of his life. In October 1946, Robert M. Jackson began work with the Alpine County Public Works Department, where he spent more than 30 years surveying, engineering, constructing, and realigning many of the county and state highway routes of today. Robert M. Jackson's most significant accomplishment was the completion of Route 89 over Monitor Pass in the early 1950's. This 18-mile span traverses both Alpine and Mono counties, and is a mountainous road reaching elevations in excess of 8500 feet. The original road grade was crooked and steep, as much as 17% in some places. The majority of the survey work done by Robert M. Jackson was on horseback. Alpine County and the Department of Transportation cooperated for 7 years to complete the project, which was dedicated on September 12, 1954. Robert M. Jackson retired from Alpine County in 1973, after 27 years of service. He remained in Alpine County until his death on May 12, 2004. " Named by Senate Concurrent Resolution (SCR) 57, Resolution Chapter 27, on 4/21/2006.