Ausable Sea Lamprey Trap

Construction of a sea lamprey trap structure at the Michigan Department of Natural Resources weir on the AuSable River, Iosco County, MI. The structure will consist of a marine platform, trap vault, and lift system. The aluminum grating platform will be 25 feet long and 10 feet wide and will be supported by driven H-piles and H-pile girders. Steel railing will be installed along the edges of the platform. The trap vault will be formed by steel plates bolted and welded to the driven piles and will have a concrete base and two sluice gates to control flow. A 1-ton pedestal mounted davit crane with a manual hoist is to be installed on the structure for trap removal. The sea lamprey trap will be constructed by the U.S. Fish and Wildlife Service (USFWS) in a separate contract and will be designed to fit into the trap vault. In addition to the construction of a sea lamprey trap structure, the project will also include the creation of an access path leading to the platform and repairs to the east bank weir wingwall. The access path will consist of two steel sheet pile (SSP) enclosures constructed on the north and south sides of an existing stormwater swale and steel grating spanning the width of the swale. The path will be 15-feet-wide and approximately 50-feet-long. The SSP enclosure will have H-pile cross beam bracing and will be filled with crushed limestone fill. The existing stormwater swale will be re-graded and lined with riprap. The repairs to the wingwall will include the installation of an SSP anchor wall and H-pile cross beam bracing connecting to the existing wingwall. Stone ranging in size from aggregate to a D50 of 10 inches, will be required throughout the project as erosion protection. Access road repairs including grading will be required at the time of construction for equipment access to the site. Restoration activities throughout the project site will include excavation, grading, and seeding prior to demobilizing equipment.

Animal/Plant/Fish Facility, New Construction.

Division 31 -	Earthwork, Erosion and Sedimentation Controls.
Division 33 -	Utilities, Storm Drainage Utilities, Ponds and Reservoirs.
Division 35 -	Waterway and Marine Construction, Shoreline Protection, Waterway Construction and Equipment.