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ROCK ISLAND DISTRICT

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Posted 5/3/2017

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Contact
Regional Program Manager located at CoeMVR -PM-M
(309) 795-5428
UMRR-EMP-Regional@usace.army.mil

Location
Pool 14, Upper Mississippi River Miles 515.0-513.0, Clinton County, Iowa.

Description
Beaver Island is located along the right descending bank of the UMRS in the southern portion of Clinton County, IA. The Project area is in Pool 14 between river miles 513.0 and 515.5 adjacent to the cities of Clinton and Camanche, IA. Lock and Dam 13 is located 5 miles upstream of the island system. Areas considered as part of this project include Beaver Slough, Grass Slough, and Lower Lake. The 2,300-acre Beaver Island Complex represents 16% of Pool 14 backwater habitat.

The complex of backwaters and wetlands has historically provided spawning, nursery, and overwintering habitat for fish and feeding and resting habitat for migratory water birds. Backwater habitat quality has degraded from excessive sedimentation since implementation of the UMRS 9-Foot Navigation Channel Project. Wetland functions have also been negatively affected by sedimentation.

The Corps proposes to rehabilitate and enhance Beaver Island by constructing measures which will increase the quality of year-round habitat for the fish community, increase floodplain forest vegetation diversity, and improve the overall structure and function of Beaver Island habitat.

The need for rehabilitation and enhancement of the Site is based on the following factors:

  1. The existing aquatic habitat currently lacks adequate centrarchid overwintering habitat (i.e., depth and flow) important for year-round habitat functioning. Without action, the available overwintering habitat will continue to decrease.
  2. The existing topography lacks forest diversity and significant amount of the island is inundated during a typical flooding event. Consequently, floodplain forest regeneration, growth, and survival are reduced. Without action, floodplain habitat will decrease in quality through succession to silver maple, open canopy, and/or reed canary grass, which is an invasive species.
  3. Albany Slough, the existing secondary channel habitat, has degrading geomorphologic features, structure, and function. Over time, Albany Island is likely to continue eroding, which would have major detrimental effects on existing mussel communities inhabiting the Albany Slough and on the fish species which serve as hosts.

Status
General design of the project has been initiated and a Feasibility Report is scheduled for completion in 2017.

Authority
CG - Construction General

Summarized Project Costs

Estimated Federal Cost  $19,100,000 
Estimated Non-Federal Cost  N/A 
Estimated Total Project Cost  $19,100,000 
Allocations Prior to Current FY 2017 Cost  $1,516,000 
Current FY 2017 Allocation (received to date)  $434,000 
Current FY 2017 Total Capability  $481,000 


Major Work Item Current Year
FY 2017:
Funds are being used to complete the Feasibility Report, Initiate plans and specification for Stage I and Continue pre-project monitoring.