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MARKER DATABASE
“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
San Francisco in San Francisco City and County, California — The American West (Pacific Coastal)
 

Fort Point Arch

 
 
Fort Point Arch Marker image. Click for full size.
By Duane and Tracy Marsteller, July 3, 2021
1. Fort Point Arch Marker
Inscription.  The curve of an arch experiences pushing forces, or compression.

At the south (San Francisco) end of the suspension bridge, a large steel arch carries the roadway deck over Fort Point, the brick fort below.

Fort Point was completed in 1861, long before the Golden Gate Bridge was constructed in the 1930s. The chief engineer planning the new bridge, Joseph Strauss, preserved the historic fort by spanning over it with an arch bridge.

A suspension bridge is the structural opposite of an arch.

The curving cables of a suspension bridge are in tension, experiencing pulling forces. The opposite or upside down picture of those curves looks like an arch. The forces in the arch, compression forces, are the opposite of the tension forces that the suspension bridge cables experience.

A tension force is a force that pulls. The curving cables pull on anchorages at the two ends of a suspension bridge. Those anchorages embedded in the earth must supply reaction forces, exerted outward, to withstand the tension in the cables that tries to pull the anchorages inward.

Caption: (shown right)
Fort Point Arch Marker image. Click for full size.
By Duane and Tracy Marsteller, July 3, 2021
2. Fort Point Arch Marker
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The steel arch spans 318 ft (97 m) over the historic Fort Point.
 
Erected 2016 by Golden Gate Bridge, Highway and Transportation District.
 
Topics. This historical marker is listed in these topic lists: ArchitectureBridges & ViaductsForts and Castles. A significant historical year for this entry is 1861.
 
Location. 37° 48.487′ N, 122° 28.551′ W. Marker is in San Francisco, California, in San Francisco City and County. Marker can be reached from Coastal Trail. Marker is in the Golden Gate Bridge Vista Point South. Touch for map. Marker is in this post office area: San Francisco CA 94129, United States of America. Touch for directions.
 
Other nearby markers. At least 8 other markers are within walking distance of this marker. Engineering the Design (here, next to this marker); A Bathtub for the South Tower (here, next to this marker); Working Under Water (here, next to this marker); Making the Impossible, Possible: The Story of the Golden Gate Bridge (here, next to this marker); World's Tallest Bridge Towers (here, next to this marker); Bridging the Gate — the Beginning (here, next to this marker); Spinning the Main Cables (a few steps from this marker); Hanging the Roadway Deck (a few steps from this marker). Touch for a list and map of all markers in San Francisco.
 
 
Credits. This page was last revised on July 15, 2021. It was originally submitted on July 6, 2021, by Duane Marsteller of Murfreesboro, Tennessee. This page has been viewed 32 times since then. Photos:   1, 2. submitted on July 6, 2021, by Duane Marsteller of Murfreesboro, Tennessee.

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Dec. 1, 2021