{{Short description|Major road in central Contra Costa County, California, United States}} {{Use American English|date=May 2025}} {{Infobox street | maint = [[Walnut Creek, California|Walnut Creek]], [[Concord, California|Concord]], [[Pittsburg, California|Pittsburg]], and [[Contra Costa County, California]] | name = Ygnacio Valley Road<br>Kirker Pass Road<br>Railroad Avenue | image = Iron Horse Trail Ygnacio Valley Rd Bridge 01.jpg | caption = [[Iron Horse Regional Trail]] pedestrian bridge over Ygnacio Valley Road | map = {{maplink|frame=yes|plain=yes|frame-align=center|frame-width=300|frame-height=240|type=line|from=Ygnacio Valley Road.map}} | map_caption = Ygnacio Valley Road highlighted in red | length_mi = 15.66 | terminus_a = Parkside Drive in Walnut Creek | junction = {{plainlist| *{{jct|state=CA|I|680|SR|24}} in Walnut Creek *{{jct|state=CA|SR|4}} in Pittsburg }} | terminus_b = E 3rd St in [[Pittsburg, California|Pittsburg]] | direction_a = Southwest | direction_b = Northeast }} '''Ygnacio Valley Road''' is a major [[arterial road]] in central [[Contra Costa County, California]]. It extends from [[Interstate 680 (California)|Interstate 680]] and [[California State Route 24|SR 24]] in [[Walnut Creek, California|Walnut Creek]] to [[California State Route 4|SR 4]] in [[Pittsburg, California|Pittsburg]]. The road passes through [[Concord, California|Concord]] and borders [[Clayton, California|Clayton]]. In the northern half of the route, it is also known as '''Kirker Pass Road''' and then '''Railroad Avenue'''. It is listed, but not signed, as '''Hillside Avenue''' at its southwest terminus.
== Route == The route begins near the [[Interstate 680 (California)|Interstate 680]]/[[California State Route 24|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.<ref>{{Cite web|last=Walnut Creek|first=City of|date=2014-02-28|title=THE LANDING AT WALNUT CREEK APARTMENTS PROJECT DRAFT EIR 4.12 TRANSPORTATION AND TRAFFIC|url=https://www.walnut-creek.org/home/showpublisheddocument/2858/635692942935770000|access-date=2021-09-12|website=City of Walnut Creek}}</ref>
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]].<ref>{{Cite web|last=Planning Division|first=The City of Pittsburg|date=2009-11-02|title=Railroad Avenue Specific Plan|url=https://www.pittsburgca.gov/home/showpublisheddocument/3500/637479142624630000|access-date=2021-09-13|website=City of Pittsburg}}</ref>
=== Major Intersections === {{CAinttop|county=Contra Costa}} {{CAint|location=Pittsburg|lspan=3|road=E 3rd Street|mile=0}} {{CAint|road={{jct|state=CA|SR|4|city1=Concord|city2=Antioch}}|notes=Interchange; SR 4 exit 23|mile=1.15}} {{CAint|road=Buchanan Road|mile=2.55}}{{CAint|location=Concord|lspan=2|road=Clayton Road|notes=|mile=7.80}} {{CAint|road=Cowell Road|notes=|mile=9.89}} {{CAint|location=Walnut Creek|lspan=7|road=Oak Grove Road|notes=|mile=11.89}} {{CAint|road=Walnut Avenue / Bancroft Road|mile=13.06}} {{CAint|road=Walnut Boulevard|notes=|mile=14.53}}{{CAint|road=Civic Drive|mile=14.77}}{{CAint|road={{jct|state=CA|road|North Main Street|to2=to|I|680|dir2=north|city1=Sacramento}}|notes=No Interchange|mile=15.08}}{{CAint|road={{jct|state=CA|I|680|city1=Concord|city2=Sacramento|city3=San Jose}}|notes=Northbound exit 46B; no northbound entrance|mile=15.45}}{{CAint|road=Parkside Drive|mile=15.66}} {{jctbtm}}
== References == {{reflist}}
[[Category:Streets in Contra Costa County, California]]
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