Hi Michael, I found the 1880 San Benito, CA Census with Job and family and a Sally Hill. Job Malsbury, b. OH, 47, farmer. Harriett, b. IL, 38. Sanford, b. CA, 17, farmer. Amy, b. CA, 11, student. Cora, b. CA, 9, student. Otis, b. CA, 5. Sally Hill, b. OH, 23, keeping house. It doesn't say how she's related and she's listed as single.
Contact the Riverdale Public Works or their local museum to find out about the street name. Successful Searching!