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Coos Bay vicinity

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Isthmus Slough Bridge, Spanning Isthmus Slough at Milepoint 0.2, Coos Cit, Coos Bay, Coos County, OR



Data Pages


Photo Caption Pages


Item Title


Location
Coos Cit, Coos Bay vicinity, OR

Find maps of Coos Bay, OR


Created/Published
Documentation compiled after 1968.

Notes
Survey number HAER OR-144
Building/structure dates: 1955 initial construction
Significance: The Isthmus Slough Bridge is significant as a good example of the bascule bridge type. This bridge is unique within the Oregon context at it is the only known bascule structure that utilizes a block and tackle lifting mechanism, as opposed to the more common motorized lifting mechanism. The lack of motorized technology distinguishes this structure within Oregon's context of moveable bridges. The Isthmus Slough Bridge is also significant as a late example of the bascule type within Oregon, as it is only one of three bascule spans built after WWII.

Subjects
Vehicular Bridges


Related Names
Stephenson, P. M.


Collection
Historic American Engineering Record (Library of Congress)

Contents
Photograph caption(s): 
Topographic view of Isthmus Slough Bridge, view looking northwest.
General perspective view of Isthmus Slough Bridge, view looking west.
General perspective view of Isthmus Slough Bridge, view looking west, south side of structure.
General perspective view of Isthmus Slough Bridge, view looking east.
General perspective view of Isthmus Slough Bridge lift tower, view looking west.
Detail view of Isthmus Slough Bridge lift tower, view looking west.
Detail view of Isthmus Slough Bridge traffic gate and Warren truss.


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