Results of Sediment Sampling and Elutriate Testing at the Proposed Indian Cave State Park Shallow Water Habitat Project Site.

摘要

A project is being proposed to construct shallow-water habitat (SWH) along the Missouri River at Indian Cave State Park in Richardson County, Nebraska. The U.S. Army Corps of Engineers (USACE) is constructing SWH along the lower Missouri River downstream of Gavins Point Dam to mitigate aquatic habitat lost from past bank stabilization and channelization, and enhance habitat for the endangered pallid sturgeon (Scaphirhynchus albus) population along the lower Missouri River. The Omaha District (District) is referring to the proposed project as the Indian Cave State Park project. Deposited sediment will be excavated at the project site to create a backwater area. Sediment excavation will involve hydraulic dredging with the dredge spoil being discharged to the adjacent Missouri River. It is believed the sediment/soil to be dredged will be primarily alluvial material. An estimated 400,000 cubic yards of sediment/soil would be excavated and discharged to the Missouri River.