 Joseph Knowland was honored, on the 101st California State Admission Day, September 9 1951, by the City of Oakland, Alameda County, and the State of California, with the renaming of the park to Joseph Knowland State Arboretum and Park.In 1973, the site was ceded to the City of Oakland, and in 1975, management of the park was granted to the City of Oakland.The largest and most pristine portion of the park is undeveloped, and yet is the most accessible to park users.