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https://hdl.handle.net/11681/39942| Title: | Elkhorn River Near Wisner, Nebraska : Section 14, Integrated Feasibility Study/Environmental Assessment |
| Authors: | United States. Army. Corps of Engineers. Omaha District. |
| Keywords: | Elkhorn River (Neb.) Flood control Shore protection Environmental protection Environmental management |
| Publisher: | United States. Army. Corps of Engineers. Omaha District. |
| Abstract: | The Elkhorn River is a meandering stream with an extremely flat gradient and very small channel capacity in relation to its drainage area. Rainfall in the spring often combines with the annual plains snowmelt to produce floods that exceed channel capacity and spread onto the broad plains. This Feasibility Study is being completed to document site visits, assess the erosion problem, evaluate alternatives, and if possible recommend a feasible alternative to provide stream bank protection to prohibit rapid erosion to the Cuming County Road 6 Bridge. The proposed project is located on the right-descending bank of the Elkhorn River in Cuming County, Nebraska, in the SE 1/4 of the NE 1/4 of Section 11, Township 23 North, Range 4 East. The county road and bridge are located approximately 1 half mile west of Wisner, NE. In 2010, the Elkhorn River experienced severe flooding induced by the runoff from a summer thunderstorm. Because the Elkhorn River is a sinuous, sand-bed river with highly erosive, silty-sandy streambanks, the flood caused significant bank erosion and lateral channel migration in many areas where the banks are not fixed by structures, such as bridges or existing bank protection. The resulting damage puts at risk adjacent road infrastructure, affected nearby residents, farm, towns and businesses. During the flood the river channel migrated approximately 600 feet into the right bank floodplain just upstream of the county road. Future migrations at this rate put the roadway at severe risk. Cuming County requested Corps assistance under the Section 14 authority and is the non-Federal sponsor for this project. |
| Description: | Feasibility Report with Integrated Environmental Assessment |
| Rights: | Approved for Public Release; Distribution is Unlimited |
| URI: | https://hdl.handle.net/11681/39942 |
| Appears in Collections: | Environmental Documents |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Elkhorn River Section 14 FS and EA_2014.pdf | 2.6 MB | Adobe PDF |  View/Open |