North End – Stockton, California
The north end of Interstate 9 was proposed to tie into the multi-level interchange joining Interstate 5 and California 4 (Ort J. Lofthus / Crosstown Freeway) in the city of Stockton.
Another potential location for the northern terminus of Interstate 9 is the exchange connecting Business Loop I-80 (Capital City Freeway) and U.S. 50 in Sacramento.
South End – Mettler, California
Representing the south end of what could be Interstate 9, California 99 separates from Interstate 5 north at a wye interchange (Exit 221) between Wheeler Ridge and Mettler.