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California’s Tallest Bridge Undergoes Major Inspection

Foresthill Bridge Faces Rigorous Testing for Safety and Stability

Cris Alarcon by Cris Alarcon
August 29, 2024
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California’s Tallest Bridge Undergoes Major Inspection

Foresthill Bridge

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El Dorado County (Aug 27, 2024, 2024) – The Foresthill Bridge, California’s tallest, towering 730 feet above the American River, is undergoing a critical inspection mandated by federal guidelines. Spanning from Auburn to Foresthill off I-80, the bridge is iconic but now faces scrutiny as all 282 steel welds made with T-1 steel from the 1960s and 70s are tested for structural integrity. The inspection, prompted by safety issues in similar bridges on the East Coast, involves ultrasonic testing to detect cracks and fractures invisible to the naked eye. Crews will use trucks, scaffolding, and spider baskets to access both high and low welds, with the complex project expected to last up to nine months. Funded by $6.2 million, 80% of the cost will be covered by federal funds and 20% by local tax dollars, ensuring the bridge’s safety for years to come.


The Foresthill Bridge, located in Placer County, California, is a towering engineering marvel and the tallest bridge in the state. Here are some key details about this iconic structure:

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1. Height and Length

  • The bridge stands at an impressive 730 feet (222 meters) above the American River, making it the highest bridge in California and one of the tallest in the United States.
  • It stretches 2,428 feet (740 meters) in length, connecting the towns of Auburn and Foresthill, providing a vital link for residents and visitors traveling over the deep American River canyon.

2. Construction and History

  • Construction began in 1971 as part of a project to reroute traffic away from the old Highway 49 route, which was deemed insufficient for modern needs.
  • The bridge was originally intended to be part of the Auburn Dam project, which was eventually abandoned due to environmental concerns and seismic safety issues.
  • It officially opened in 1973, and despite the cancellation of the dam, it remains a critical infrastructure piece, providing breathtaking views of the surrounding landscape.

3. Design and Structure

  • Designed as a truss arch bridge, it utilizes T-1 steel, a material commonly used in the 1960s and 70s for its strength but now subject to strict safety inspections due to potential issues with weld integrity.
  • The bridge is supported by concrete piers and features a green-painted steel deck that has become an iconic sight for travelers on the route.

4. Inspection and Maintenance

  • Due to its age and height, the Foresthill Bridge undergoes rigorous and ongoing maintenance. Current inspections are focused on testing the structural integrity of the welds to ensure the bridge’s safety, involving advanced techniques like ultrasonic testing.
  • The ongoing inspection and maintenance project, expected to take several months, underscores the importance of this bridge to local transportation.

5. Cultural Significance

  • The Foresthill Bridge is a popular spot for filming, appearing in movies such as “XXX” starring Vin Diesel. Its dramatic height and scenic backdrop have made it a go-to location for filmmakers.
  • It’s also a favored spot for bungee jumping and base jumping enthusiasts, though these activities are often illegal and highly dangerous due to the sheer height.

6. Scenic Views and Recreation

  • The bridge offers stunning views of the American River Canyon, attracting tourists, photographers, and those seeking a unique vantage point of Northern California’s rugged beauty.
  • There are nearby hiking trails, including some that pass beneath the bridge, providing an up-close look at this towering structure from below.

The Foresthill Bridge stands not only as a functional piece of infrastructure but also as a testament to mid-20th-century engineering and the adventurous spirit of those who live and explore in the Sierra Nevada foothills.

Source: Local News
Via: Cris Alarcon
Cris Alarcon

Cris Alarcon

Former Member: Executive Board of Directors, Treasurer, Boys & Girl Club of El Dorado County Western Slope. - Former Member: Board of Directors, Treasurer, Food Bank of El Dorado County. - Opening Team Dealer at Red Hawk Casino - Retried EDC Elections Department Inspector. - Youngest Charter Member of the Hangtown Kennel Club. - Political Strategist and Campaign Manager.

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© 2023 Placerville Newswire Commentary is produced by the Placerville Newswire, a private service focusing on Placerville Local Area issues. All conclusions expressed in this publication should be understood to be solely those of the author(s). You may find us in El Dorado County Placerville, CA 95667