Arroyo Simi Overhead
{{Use mdy dates|date=April 2025}}
{{Use American English|date=January 2025}}
{{Infobox bridge
|bridge_name = Arroyo Simi Overhead
|image =
|image_size =
|caption =
|official_name =
|carries = 4 lanes of {{Jct|state=CA|SR|118}}
|crosses = Arroyo Simi
|locale = Moorpark, California
|coordinates={{Coord|34|17|13|N|118|51|53|W|display=inline,title}}
|owner = Caltrans
|maint = Caltrans
|material = Concrete
|pierswater =
|width = {{convert|14|m|ft}}
|height =
|load =
|clearance = {{convert|13|m|ft}}
|length = {{convert|538|m|mi}}
|below =
|traffic =
|begin = April 19, 1991{{cite news|url=https://www.latimes.com/archives/la-xpm-1991-04-20-me-8-story.html|title=Long-Awaited Freeway Connector Project Starts: Transportation: The route will bridge the gap between the Moorpark and Simi Valley freeways and reduce Los Angeles Avenue congestion.|work=Los Angeles Times|date=April 20, 1991|first=Gerry Brailo |last= Spencer }}
|complete =
|open = {{start date and age|October 15, 1993}}{{cite web|url=https://www.latimes.com/archives/la-xpm-1993-08-20-me-25616-story.html|title= Freeway Connector Opening Due Oct. 15|work=Los Angeles Times|date=August 20, 1993|first= Phil|last=Sneiderman}}{{cite news|url=https://www.latimes.com/archives/la-xpm-1993-10-09-me-43760-story.html|title=Westbound Freeway Linkage Opened|work=Los Angeles Times|date=October 9, 1993|first= Phil|last=Sneiderman}}
|closed =
| replaces = Los Angeles Avenue{{cite news|url=https://www.latimes.com/archives/la-xpm-1993-10-16-me-46493-story.html|title=Connector Is Welcomed by Officials, Commuters|work=Los Angeles Times|date=October 16, 1993|last1=Catania|first1=Sara }}{{cite news|url=https://www.latimes.com/archives/la-xpm-1993-10-16-me-46266-story.html|title=Test Drives Show the New Route to Be a Time Saver|work=Los Angeles Times|date=October 16, 1993|last1=Catania|first1=Sara |last2=Reed|first2=Mack}}
|toll =
| builder =C. C. Myers (bridges)
C. A. Rasmussen (roadwork){{cite news|url=https://www.latimes.com/archives/la-xpm-1993-01-21-me-1703-story.html|title=Rains Delay Completion of Freeway Connector|work=Los Angeles Times|date=January 21, 1993|first=James|last=Maiella Jr.}}
}}
The Arroyo Simi Overhead is a tall viaduct in Ventura County, California, that carries State Route 118 (SR 118, Ronald Reagan Freeway) over the Arroyo Simi. At the south end of the bridge, the freeway continues as SR 23.[https://web.archive.org/web/20061004230016/http://www.dot.ca.gov/hq/structur/strmaint/brlog/logpdf/logd07.pdf Caltrans Bridge Log 7, p. 59] The state routes continue as highways to the west and north respectively. The entire connector, completed in 1993, is {{convert|2.2|mi|km|}} long and includes seven bridges.{{cite news|url= http://www.vcstar.com/news/moorpark-officials-push-for-fencing-on-freeway |title=Moorpark officials push for fencing on freeway connector to prevent suicides|first=Michele |last=Willer-Allred|work=Ventura County Star|date= April 17, 2014}}
The railroad line between Simi Valley and Moorpark together with a local road also pass under the two main {{convert|100|ft|m|adj=mid|-high}} bridges that separately carry the traffic in each direction, each more than {{convert|1,400| ft|m}} long. A wetlands was created as a mitigation measure for the impacts of the construction on the Arroyo Simi. Nearby Moorpark College manages and maintains the site which is used as a nature center by the environmental science program.{{cite news|url=https://www.latimes.com/archives/la-xpm-1995-07-09-me-21885-story.html|title=Man-Made Wetlands' Future Starts to Dry Up: Despite initial success, biologists say a site near the Simi Valley-Moorpark freeway interchange will be choked by silt within 20 years.|work=Los Angeles Times|date=July 9, 1995|first=Joanna M. |last=Miller}}