Point Bonita Lighthouse Pedestrian Bridge 2012 - Geobrugg Point Bonita Lighthouse Pedestrian Bridge 2012 - Geobrugg
Point Bonita Lighthouse Pedestrian Bridge 2012 - Geobrugg Point Bonita Lighthouse Pedestrian Bridge 2012 - Geobrugg
Point Bonita Lighthouse Pedestrian Bridge 2012 - Geobrugg Point Bonita Lighthouse Pedestrian Bridge 2012 - Geobrugg
Point Bonita Lighthouse Pedestrian Bridge 2012 - Geobrugg Point Bonita Lighthouse Pedestrian Bridge 2012 - Geobrugg

Point Bonita Lighthouse Pedestrian Bridge

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ZIP code
94965
Place
Sausalito, CA
Country/Region
United States
Year of installation
2012
Customer
National Park Service
Engineering
HDR, Inc.
Contractor
AIS Construction (defunct)
Other participating companies
Yeh and Associates, Inc.
Protected object
Building, Touristic infrastructure
Energy absorption capacity
100 kJ
System height
20.0 m
System length
223 m
Corrosion protection
GEOBRUGG SUPERCOATING® + PET, INOX / STAINLESS
Situation

In 1954, the U.S. Coast Guard built a suspension footbridge to access the Point Bonita Lighthouse on the outer northwestern point overlooking the Pacific Ocean and San Francisco Bay. Over the years, the bridge had been renovated, but needed to be replaced in 2012. Before a new bridge could be constructed, the rock face needed to be stabilized. The point’s rock mass was fracturing and displaying signs of instability due to years of exposure to harsh marine elements. Stabilization was required to support the weight of a modern bridge without fracturing further.

Description

A stainless steel anchored SPIDER S4-230 mesh system was installed to stabilize the rock face. The diamond shaped net is comprised of three 4 mm wires twisted into a 1x3 strand, with tensile strength of 239 ksi and a diameter of 5/16 inches. As required by the National Park Service, the net was powder coated bronze to better blend with the natural color of the rock mass and further protect against corrosion.

The project won ENR California’s Best Small Project — Construction award in 2012.

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Kevin H. Coyle
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Pierce Runnels, Civil Engineer
Pierce Runnels, Civil Engineer
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Algodones NM 87001 / USA
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