ROBERT I SCHRODER (IRON HORSE) OVERCROSSING

Pleasant Hill, California

The Robert I. Schroder Overcrossing provides safe passage for pedestrians and bicyclists over a major traffic intersection, connecting a commuter rail station, high-density development, and the 33-mile Iron Horse Trail. The bridge’s deck is supported by cable hangers from two inclined multi-pipe arch ribs. Emerging from a single foundation, the arches tilt outward, creating a striking sculptural form while minimizing the footprint. The curved, S-shaped design accommodates site constraints, preserving utilities and trees, while enhancing structural efficiency and aesthetics. Lightweight and streamlined, the bridge incorporates a hull-like deck underside for rigidity and rhythm. Inspired by a nearby historic bridge, Donald MacDonald Architects (DMD) collaborated with the engineering team to develop all aesthetic detailing, the design blends modern engineering with community-driven input for a dynamic, transit-oriented landmark.

Client – Contra Costa County
Location – Pleasant Hill
Timeline – 2008-2010
Bridge Engineer – Arup
Overall Length – 800′
Type – Arch
Main Span – 245′
Spans – 7
Deck Width – 10′

'At its own modest scale, the Robert I. Schroder Overcrossing shows what an icon can be. You don't expect to see it; once you do, you're glad it's there. And you look forward to seeing and experiencing it again,' John King SF Gate

The Bridge is part of the Pleasant Hill BART Station Specific Plan, including refined designs for streets and parking lots, public open spaces, building massing and character and allowed uses. The design’s specific features address the needs of bicyclists and pedestrians in the major transportation and commercial hub of Pleasant Hill. The DMD team collaborated with the Redevelopment Agency of Contra Costa County, incorporating extensive community input.

DMD was active in the charrette process involving all key participants, including designers, local citizens, land and business owners, agencies, and officials, all of whom contributed to the development of a detailed and finished design. This shared experience has created a momentum that enabled the project to survive political and economic challenges.

Awards

2011 Project of the Year Award: California Transportation Foundation Awards

2011 Award of Merit for Transportation; Engineering News Record

2011 Outstanding Public Facility Project for Beauty of the Environment; Walnut Creek Action for Beauty Council Community Awards

2012 Outstanding Public Facility Project for Beauty of the Environment; Walnut Creek Action for Beauty Council Community Awards