Accession Number : ADA303435

Title :   Zebra Mussel Densities in St. Paul District, 1991-1994.

Descriptive Note : Technical notes.

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

Personal Author(s) : Yager, Tim

PDF Url : ADA303435

Report Date : OCT 1995

Pagination or Media Count : 4

Abstract : The purpose of this technical note is to summarize the zebra mussel densities found in Lock and Dam 7 at La Crescent, MN, in 1994. In addition, zebra mussel densities for 1991-93 and projected densities for 1995-97 at St Paul District locks and dams are discussed. Structural maintenance of the locks and dams in the St. Paul District portion of the upper Mississippi River (UMR) is usually conducted on a rotating basis, with one lock dewatered each year for maintenance and rehabffitation. Locks and Dams 8, 9, and 6, were dewatered in 1991, 1992, and 1993, respectively. In early December 1994, Lock and Dam 7, located at La Crescent, MN (Figure 1), was dewatered for major maintenance and repair. The dewatering provided an opportunity to collect information on the densities of zebra mussels on the lock floors and walls within the chamber.

Descriptors :   *DENSITY, *MUSSELS, *DAMS, MAINTENANCE, REMOVAL, STRUCTURAL PROPERTIES, WATER, REPAIR, WALLS, MISSISSIPPI RIVER.

Subject Categories : Toxicology
      Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE