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Intertidal disposal of dredged materials at Depoe Bay, Oregon: an analysis of effects

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https://ir.library.oregonstate.edu/concern/defaults/2j62s577p

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  • Depoe Bay, situated on the Oregon Coast about 100 miles south of the mouth of the Columbia River and 13 miles north of Yaquina Bay at Newport, Oregon, is a small, rock-bound tidal lagoon much affected by man's activities. In its natural condition, Depoe Bay was very shallow, with a narrow channel to the sea carved by streamflow from Depoe Creek and North Depoe Creek (see figure 1). In early days, the bay provided a sheltered harbor for fishing vessels, but the narrowness of the channel and the shallowness of the bay limited passage to and from the bay to 􀀕eriods of high tide; cradles were used to keep moored vessels upright during low tide. In 1939, as a result of the desire of local residents and others to stimulate additional use of the harbor, the Corps of Engineers began work. The channel was widened to facilitate passage and to increase water level through tidal influence; some dredging of the bay was also performed. In the late 1940's, extensive additional work was performed by the Corps! The channel was widened further, to its present 50-foot width, and the bay was dredged to an approximately uniform 8-foot depth. A boat basin about 390 feet by 750 feet was thus created, with a retaining wall along its eastern boundary. A check dam near the mouth of Depoe Creek was constructed to reduce the amount of stream-borne silt entering the bay. To reduce wave activity at the channel entrance, a concrete breakwater was built at the north side of the channel's seaward end; a second, complementary breakwater adjacent to the original was added in 1966. The cover photograph and figure 2 show Depoe Bay as it appears today.
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  • File scanned at 300 ppi (Monochrome, 256 Grayscale) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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file details IntertidalMaterialsDepoe1978.pdf 2017-07-13 Pubblico Scaricare