Wetland Enhancement Near Columbia River Mile 68

by Brian W. Lichtcap, Corps of Engineers, Portland, OR, USA,

Document Type: Proceeding Paper

Part of: Coastal Zone '87


The May 18, 1980 and subsequent eruptions of the Mt. St. Helen's volcano, and consequential ashy river sedimentation have caused major changes to a wetland adjacent to Carrolls Channel, a principal side channel of the Columbia River. Topographic features at three other wetland sites were reconnoitered and a species list with their respective water regime preference prepared. Pilot projects chosen experimented with a range of topographic alterations that we believed were similar to natural riverine topography in this area. During the month of Sept 1982 approximately six inches of the surface sediments within the wetland was scraped back to the edge of the authorized emergency disposal site, and two ponds and a small slough approximately one-half mile in length were created. The four years of observation of pilot wetland creations revealed a useful range of opportunities and problems associated with wetland, restoration on this portion of the Columbia River where vegetation has, been largely unstudied.

Subject Headings: Wetlands (fresh water) | Rivers and streams | Wetlands (coastal) | Volcanic deposits | Emergency management | Volcanic eruption | Topography | Vegetation

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