Progress in the cofferdam construction at the Onalaska dam, under construction on the Upper Mississippi as part of Upper Mississippi River improvements.
Clearing operations at the dike section of cofferdam at the Onalaska dam, under construction on the Upper Mississippi as part of Upper Mississippi River improvements.
Construction of the cofferdam nearing completion at the Onalaska dam, under construction on the Upper Mississippi as part of Upper Mississippi River improvements.
Burning brush in the dike area of the cofferdam for the Onalaska dam project, under construction on the Upper Mississippi as part of Upper Mississippi River improvements.
A general view of the cofferdam under high water conditions. The cofferdam is part of the Onalaska dam project, under construction on the Upper Mississippi as part of Upper Mississippi River improvements.
General view of equipment within the cofferdam, part of the Onalaska dam project. The Onalaska dam underwent construction as part of Upper Mississippi River improvements.
A train car waits beside the cofferdam, part of the construction of the Onalaska dam. The Onalaska dam was constructed as part of Upper Mississippi River improvements.
Workmen set up aggregate bins at the cofferdam, part of the Onalaska dam project, under construction on the Upper Mississippi as part of Upper Mississippi River improvements.
A crane operates on common excavation and disposal of material below the cofferdam, part of the Onalaska dam project. The Onalaska dam underwent construction as part of Upper Mississippi River improvements.
Men set up a pump for disposing of common excavation below the cofferdam, part of the Onalaska dam project. The Onalaska dam underwent construction as part of Upper Mississippi River improvements.
Workmen use a hose inside the cofferdam in this photograph, which shows the condition of the lower elevation. The cofferdam is part of the Onalaska dam project and underwent construction as part of Upper Mississippi River improvements.
Permanent steel sheet piling in place within the cofferdam, part of the Onalaska dam project. The Onalaska dam underwent construction as part of Upper Mississippi River improvements.
A general view of the cofferdam under high water conditions. The cofferdam is part of the Onalaska dam project, under construction on the Upper Mississippi as part of Upper Mississippi River improvements.
A general view of the cofferdam with the river elevation above the cofferdam at 637.9. The cofferdam is part of the Onalaska dam project, under construction on the Upper Mississippi as part of Upper Mississippi River improvements.
A sub contractor places cofferdam fill while workers look on from the rail spur as part of the Onalaska dam project, under construction on the Upper Mississippi as part of Upper Mississippi River improvements.
Men work on the hydraulic stripping of top soil inside of the cofferdam as part of the Onalaska dam project, under construction on the Upper Mississippi as part of Upper Mississippi River improvements.
A general view of the unwatered cofferdam, part of the Onalaska dam project, under construction on the Upper Mississippi as part of Upper Mississippi River improvements.
Removing sand fill at the downstream arm of the cofferdam at the Onalaska dam. The Onalaska dam project was undertaken as a part of improvements to the Upper Mississippi River.