Environmental Assessment. Gregory Diversion Channel Maintenance Dredging, Mississippi River Pool 20, Lewis County, Missouri
Abstract
Gregory Drainage District provides interior drainage for nearly 8,000 acres of agricultural lands and surrounding watershed in Lewis County, Missouri. The runoff, however, is a source of the sediment which necessitates routine maintenance of the drainage channels to maintain proper flow. Maintenance dredging of Gregory ditch will create a uniform drainage system that flows from the District's pump station to the Mississippi River. The proposed project would be funded under the authority of the Rivers and Harbors Act of 1930 which authorizes construction and maintenance of the 9-foot Mississippi River navigation channel. In order to comply with the National Environmental Policy Act of 1969, this Environmental Assessment was prepared to address impacts associated with construction and utilization of new dredged material placement sites along the Mississippi River. The Gregory Drainage District has a pumping station located 4.4 miles upstream of Lock and Dam 20 at O'Farrell Lake. The outlet channel for the pump station, Gregory drainage ditch, currently empties into the Mississippi River downstream of Lock and Dam 20. The diversion channel was constructed in 1936 with a pump station installed in 1977 at O'Farrell Lake to increase the efficiency of the drainage system.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1989
- Accession Number
- ADA219465
Entities
Organizations
- Rock Island District, U.S. Army Corps of Engineers