The Avon, Conn. branch of Oldcastle Precast was chosen by the Connecticut Department of Transportation (Connecticut DOT) to design, fabricate, ship, and erect the precast concrete pool and weir fish ladder units, and precast concrete footings for their State Route 410 culvert rehabilitation project.
The Connecticut DOT made the decision to make these inclusions after learning their benefits on a site by the Connecticut Department of Energy & Environmental Protection (CT DEEP) Inland Fisheries Division and the Fishery department. The new ladder would provide fish with passage through the slip line repaired culvert as well as restore connectivity to over 1.4 miles of stream habitats.
At their Avon manufacturing facility, Oldcastle Precast created fourteen, 7-foot-4-inch-high by 9-foot-4-inch-wide, fish ladder units, with monolithically cast weirs, and fifteen, approximately 3-foot-wide by 11-foot-4-inch-long by 10-inch thick footings which provide structural support under the fish ladder. Following installation of the fish ladder, the units were connected by angle locking devices that provide a silt-tight connection.
“This project required precision manufacturing and had to be manufactured within exacting tolerances, within fractions of an inch, to site assemble the precast components and meet the requirements of the fish ladder specifications,” said Victoria Bazzano of Oldcastle Precast. “We were very happy with the project outcome. The precast fish ladder units fit together perfectly and the project went smoothly with no major issues. The Connecticut Department of Transportation plans on having more of these all over Connecticut.”