Accession Number : ADP001776

Title :   USAE Division/District Presentations Aquatic Plant Problems-Operations Activities: North Pacific Division, Portland District,

Corporate Author : ARMY ENGINEER DISTRICT PORTLAND OREG

Personal Author(s) : Paveglio,Fred

Report Date : JUN 1983

Pagination or Media Count : 3

Abstract : In order to determine the prevalance of milfoil infestations in the Portland District, a reconnaissance survey was initiated. A plant taxonomist form Oregon State University was contracted to conduct the survey. Specimens in the genus Myriophyllum were collected from 28 locations during the reconnaissance survey. Aquatic Plant Control Program funds received by the Portland District for FY82 were used to initate the monitoring plan proposed by the Reconnaissance report. The Portland District contracted WES to assist on the development of a rapid identification methodology for Eurasian watermilfoil. Ninety locations were identified during the aerial survey that appeared to have submerged aquatic plants on the Willamette River. The most dense beds of Eurasian watermilfoil were located at the upper reaches of the river. On 145 miles of the Columbia River, 12 areas were identified that appeared to support aquatic plants. Native watermilfoil (Myriophyllum exalbecens) was identified at five of the locations. The information obtained from the montioring plan initiated by the Portland District clearly identifies a growing problem created by Eurasian watermilfoil. The impact of milfoil thus far has been on fish an wildlife habitat with the exception of Blue Lake. The results of the monitoring program have been presented to the State Department of Agriculture.

Descriptors :   *Aquatic plants, *Weed control, Symposia, Aquatic weeds, Plant growth, Reconnaissance, Surveys, Ecosystems, Distribution, Collection, Sampling, Identification, Oregon

Distribution Statement : APPROVED FOR PUBLIC RELEASE