In 1914 work was ongoing to dig the present ship canal at Fremont. The original, narrow channel had already been made wider and had been spanned with a bridge called a trestle, meaning a flat, rigid structure supported by posts.  The trestle bridge was wide enough to support streetcar rails and had a lane for the increasing number of automobiles which were being driven in Seattle.  During the work of digging a much deeper and wider channel for the ship canal, the waters of Lake Union were held back by a timber dam at the northwest corner of the lake.

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