64North wins the new Adobe Creek Pedestrian & Cyclist Bridge competition


OVERVIEW: For many years, the infrastructure of the automobile has created emissions, noise, and divisions in our communities.  Palo Alto has instead embraced a more multimodal future, choosing walking and cycling, developing car sharing and even self-driving vehicles.  At the confluence between Adobe and Barron Creeks, the Adobe Creek Pedestrian & Cyclist Bridge creates a new multifunctional, more forward-looking infrastructure, a synthesis of architecture, engineering, landscape, and art.

© City Palo Alto
© City Palo Alto

Drawn from the trajectories of the cyclists moving along it and the sinuous waterways that trace the edges of San Francisco Bay, it is designed not as an icon but as an experience, creating a more consequential relationship between Palo Alto and the Bay.

© City Palo Alto
© City Palo Alto

ORGANIZATION: West of US 101 the bridge ascends in a counterclockwise loop, arcing over the freeway before descending in a broad circle. To the east, a new gathering space provides a place to sit and take in the view, with amenities including bicycle repair.  Encircled by the bridge is a new vernal pond and boardwalk, a new way to explore the Palo Alto Baylands and the Bay.  Recognizing the challenges of multiple users traveling the same route, the bridge creates dedicated zones for pedestrians and cyclists, lifting one above the other, and separating them in plan.

© City Palo Alto
© City Palo Alto

Over the freeway the arch gestures to the sky, creating a cathedral-like space. More than a crossing, it is a space to pause and reflect. Twin pathways over the Baylands integrate structure within their solid interior rails, levitating over the sensitive landscape below with piers nearly 100 feet apart. West of the freeway bicycles are outboard, maximizing their turning radius; here, pedestrians are oriented outward, the walkway expanding to provide a space to birdwatch, rest on a bench, and take in the view.

© City Palo Alto
© City Palo Alto

STRUCTURE: Structured as an arch, the bridge leans northward, counterposed to the deck, a network of thin cables between, the first curved network cable arch of its kind.  A gateway over the freeway, it is slender, structurally efficient, and cost effective, with excellent seismic performance, eliminating supports in the median and between US 101 and Bayshore Road, increasing safety and future flexibility.

© City Palo Alto
© City Palo Alto

The deck, a thin eighteen inches, maximizes visibility and lowers the bridge profile, reducing its length and cost.  Constructed of corrosion-resistant weathering steel, its warm hues are sympathetic with the Baylands’ natural palette.  This innovative approach extends to construction:  erected at a temporary location while foundation work is underway, the arch can be rolled into place with self-propelled modular transports, reducing traffic disruption to a single nighttime closure.

© City Palo Alto
© City Palo Alto

LANDSCAPE: The landscape recognizes its strategic place in the broader watershed, leveraging its small footprint for larger-scale change through hydrologic and symbolic connection.  Storm water is captured from the bridge, bike path, and frontage road, treated and routed to a new basin.

© City Palo Alto
© City Palo Alto

As the water mixes with seasonal ground water and residual bay mud salinity, this vernal pool creates a new ecological niche.  Overflow and grey water from a possible bathroom and drinking fountains can be recaptured in tanks concealed in the bridge abutments, irrigating vertical gardens of pollinator species flanking their sides.

© City Palo Alto
© City Palo Alto

Buffering sound and absorbing particulates, these living walls also draw the natural character of the Bay into the City as users first encounter the bridge to the west.  Finally, this site, like the rest of the Bay, must address sea level rise:  the design anticipates this change, enabling future ecologies and habitats and communicating the importance of resiliency.

© City Palo Alto
© City Palo Alto

ART: Finally, a large-scale artwork by artist Ned Kahn is integrated into the bridge, utilizing technology to engage the natural phenomena of the site.  Brushed stainless steel disks are fixed to the cable net, weathervanes swaying in the wind, deterring birds and ensuring their safety.  Undulating with each gust and passing vehicle, they sparkle in the sun, an ineffable experience of motion and light.

© City Palo Alto
© City Palo Alto

Location: Palo Alto, USA
Architects: 64North
Landscape Architecture: Bionic
Cycling Advisor: Jeff Selzer
Lighting: Sean O’Connor Lighting
Art: Ned Kahn
Engineering: HNTB
Environmental Consulting: WRA
Year: 2015
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