This Russian River Bridge at Cosmo, which was built from scratch, uses a Camelback Truss. A Camelback truss is a variation of the Parker truss that has a polygonal upper chord of exactly five slopes. This provides some saving of material with the greatest depth of truss where it is most required, at the center of the span.

While it is normal not to tear down an old bridge in order to build a new bridge, it is still odd to imagine a time when this bridge and the 1890's bridge stood next to each other.

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Once the railroad discontinued service to the area in 1937, the Russian River bridge was converted to a one-lane automobile bridge. The road surface on the bridge was made of wood.

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Here is the completed one-lane automobile bridge that was fashioned from the 1914 railroad bridge. Note it is dark in color, perhaps green with white railings.

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The one-lane bridge was closed for eight months while this expansion to two lanes was done. The two trusses were kept intact and each side was moved five feet left and right on top of expanded concrete piers. The other steel supports over and under the roadway were replaced with a new wider configuration. The tops of the piers were expanded but not considered a seismic upgrade until 1998.

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Large piers and additional bracing has made this bridge ready to last a really long time.

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