Ygnacio Valley Road

The route begins near the Interstate 680/Highway 24 junction, at the westbound entrance to Highway 24 at Ygnacio Valley Road, although this portion is actually signed as Hillside Avenue. It then changes signage to Ygnacio Valley Road through an interchange with I-680 and continues though downtown Walnut Creek and Heather Farm Park.^[1]

The road then enters Concord through Lime Ridge Open Space and continues into the Clayton Valley neighborhood. After the intersection with Clayton Road, its signage changes to Kirker Pass Road. It then makes an approximately 4.5 mile-long pass over the northern Diablo Range. It then enters Pittsburg, where it changes signage to Railroad Avenue at the Buchanan Road intersection. From here it continues through central Pittsburg before terminating at East 3rd St near the Pittsburg Marina.^[2]

The entire route is in Contra Costa County.

Location	mi	km	Destinations	Notes
Pittsburg	0	0.0	E 3rd Street
	1.15	1.85	SR 4 – Concord, Antioch	Interchange; SR 4 exit 23
	2.55	4.10	Buchanan Road
Concord	7.80	12.55	Clayton Road
	9.89	15.92	Cowell Road
Walnut Creek	11.89	19.14	Oak Grove Road
	13.06	21.02	Walnut Avenue / Bancroft Road
	14.53	23.38	Walnut Boulevard
	14.77	23.77	Civic Drive
	15.08	24.27	North Main Street to I-680 north – Sacramento	No Interchange
	15.45	24.86	I-680 – Concord, Sacramento, San Jose	Northbound exit 46B; no northbound entrance
	15.66	25.20	Parkside Drive
1.000 mi = 1.609 km; 1.000 km = 0.621 mi