Environmental Assessment: Mooring Cell Construction at Mississippi River Mile 557.4 Near Bellevue, Iowa
Abstract
It is proposed to build a towboat mooring cell about 0.7 mile upstream from Lock and Dam 12 on the Mississippi River at River Mile 557.4. A 30-foot-diameter cell will be constructed of steel sheet piling with sand fill and a concrete cap. Approximately 1,780 cubic yards of rock berm will be deposited on the river bottom around the cell to stabilize the structure. Short- term adverse impacts due to construction and placement of the rock berm are expected to be offset by long-term benefits resulting from the introduction of a biologically productive rockpile at the construction site. No adverse impacts to endangered species or other environmental concerns are anticipated. The study was initiated in the fall of 1985, and an evironmental assessment was prepared and released for public review in March 1986. New information received during the review period concerning the possible presence of mussel beds and the endangered species Lampsilis higginsi caused the Fish and Wildlife Service to request that the Rock Island District conduct a biological assessment. Results of the biological assessment and updated project design information are incorporated in this revised environmental assessment. Keywords: Environmental impact, Construction materials, Civil engineering, Mussels.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1988
- Accession Number
- ADA198584
Entities
Organizations
- Rock Island District, U.S. Army Corps of Engineers