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San Juan Creek Bridge Replacement Project

Construction Updates

The Orange County Transportation Authority (OCTA), in coordination with Metrolink, is replacing the railroad bridge over San Juan Creek. Built in 1917, the bridge has reached the end of its useful life and will be replaced by a new three-span girder bridge.

Project Details

SJC Bridge

The San Juan Creek Bridge Replacement Project will replace the railroad bridge over San Juan Creek in the City of San Juan Capistrano.

The project will construct a new three-span girder bridge west of the existing bridge. The new bridge will enhance safety, reduce maintenance needs, and meet current design and bridge load standards. The existing bridge will be demolished, and a new foundation and substructure will be installed for a potential future bridge. There are no plans to construct a second bridge but if a need arises, the supporting infrastructure will be in place.

The bridge serves Metrolink and Amtrak Pacific Surfliner passenger trains, as well as freight trains.

The project will also:

  •    Construct tracks
  •    Construct a new bikeway underpass
  •    Construct retaining walls
  •    Install new utilities and signals
  •    Remove vegetation

Construction Activities


Retaining Walls

Crews are constructing multiple retaining walls adjacent to the bikeway bridge over San Jan Creek Trail. The longest retaining wall being constructed is within the rail right of way next to City Hall and the Santa Margarita Water District facilities. This wall will be approximately 470' long and 6' tall.

This work may be loud. The schedule is subject to change due to inclement weather or unforeseen operational issues.

retaining wall
pile wall

Community Impacts


San Juan Creek Trail

For the safety of crews and trail users, a segment of the San Juan Creek Trail is being closed intermittently during weekdays to allow crews to continue constructing retaining walls and performing work on the new railroad bridge adjacent to the trail. In addition, the trail is expected to be closed after the New Year holiday, beginning on Thursday, Jan. 2 for approximately two weeks.

The trail is set to close on the dates listed below from 6 a.m. to 5 p.m. and will reopen to pedestrians and bicyclists at the end of each work day.

  • Monday, Dec. 23
  • Thursday, Dec. 26
  • Friday, Dec. 27 **
  • Monday, Dec. 30
  • Thursday, Jan. 2 **
  • Friday, Jan. 3
  • Monday, Jan. 6 and Tuesday, Jan. 7
  • Wednesday, Jan. 8 **
  • Thursday, Jan. 9 to Wednesday, Jan. 15

** Indicates trail will be closed from 6 a.m. to 7 p.m.

This work may be loud. The schedule is subject to change due to inclement weather or unforeseen operational issues.

Trail users will detour to Camino Capistrano, Del Obispo Street and the Trabuco Creek Trail. Detour signs will be installed prior to the closure.

detours map
Click on the map to enlarge.

Train Horns

Federal Railroad Administration (FRA) guidelines require all trains to sound their horns when workers are present, in emergency situations or when there are trespassers on or around railroad tracks. This federal mandate applies to construction zones. As a result, for the safety of construction workers, train crews and passengers, and the public, horns will be sounded when trains pass through the area.

Additional Impacts

The public and businesses adjacent to the work area may experience noise and vibration from demolition and drilling activities as well as light from construction operations. Noise may also be generated from construction equipment back-up alarm. The alarms are required by state regulation.

Community Outreach

The Public Outreach team regularly hosts project information booths at Descanso Park in San Juan Capistrano. In addition, the team participates in community events.

Businesses or civic organizations that would like to receive a project presentation may email the team at SJCBridge@octa.net.

Latest Activity

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December 20, 2024
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December 13, 2024
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December 6, 2024
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November 22, 2024
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November 15, 2024
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November 8, 2024
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November 1, 2024
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October 25, 2024
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October 18, 2024
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October 11, 2024
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October 4, 2024
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September 27, 2024
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September 23, 2024
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September 20, 2024
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September 13, 2024
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September 6, 2024

Contact the Outreach Team

If you have any questions or would like to request information in another language, please contact the Outreach Team at (800) 724-0353 or email SJCBridge@octa.net.