ST. MARYS DAM SPILLWAY REPLACEMENT — OHIO DEPARTMENT OF NATURAL RESOURCES
Sector
Flood Control Systems
Client
Ohio Department of Natural Resources
Location
Celina, OH
State
Ohio
Status
Complete
By the Numbers
Metrics
7,000 CY
Mass Concrete
750 FT
Sheet Pile Cofferdam
55K CY
Silt and Sediment Removal
25K CY
Clay Embankment Numerous Operations from Floating Barges
Challenge
Replace an aging spillway with a massive gravity dam within one of Ohio’s largest and most heavily silted water bodies while maintaining lake-level control and flood protection throughout construction. Manage extensive sediment removal, cofferdam construction in open water, and complex mass-concrete placement under challenging hydraulic and environmental conditions.
Solution
ESW implemented a comprehensive in-water construction strategy that included extensive sediment removal, construction of a 750-foot sheet pile cofferdam installed from a floating barge, and installation of a temporary spillway to maintain lake-level control throughout construction. By safely isolating the work area and executing the complex mass-concrete dam construction in phases, ESW successfully replaced the failing spillway and delivered a long-term flood-control solution for Grand Lake St. Marys.
Project Scope
E.S. Wagner served as the prime contractor for the Ohio Department of Natural Resources’ Grand Lake St. Marys Spillway Replacement project, designed to address chronic flooding and replace a deteriorating spillway structure. The project included construction of a new 160-foot horseshoe-shaped concrete gravity dam extending into Ohio’s largest manmade lake, along with an 80-foot bridge supporting the perimeter roadway. Construction required removal of 55,000 cubic yards of silt and sediment, placement of 25,000 cubic yards of clay embankment, and excavation of a deep concrete keyway to anchor the dam foundation. The dam utilized 7,000 cubic yards of mass concrete and was constructed within a cofferdam formed by a 750-foot steel sheet pile wall installed from barges and stabilized with 20,000 tons of stone. A temporary spillway consisting of two 60-inch pipes was maintained throughout construction to provide emergency lake overflow capacity. The new structure improved flow management and reduced chronic flooding.
On the Ground
Project Gallery
Final photography, captions, and any video to be supplied by ESW per project.
Keep Exploring
Related Projects
-
RESTORATION OF NORTH/SOUTH SEAWALLS — PERRY’S VICTORY & INTERNATIONAL PEACE MEMORIAL – NATIONAL PARK SERVICE
Port Clinton, OH
4925 CY
Concrete for Structures (Batched On-Island)
6875 LF
Cofferdam
-
PORT CLINTON SEAWALL
Port Clinton, OH
29,000 SF
Permanent Steel Sheeting
21,000 SF
Stamped and Colored Concrete
-
ST. JOSEPH RIVER FLOOD CONTROL
Fort Wayne, IN
5,500 FT
of Flood Wall, 5’ to 15’ Tall
175,000 CY
of Cohesive Embankment
From Proof to Partnership
Have a Project Like This?
Bring us your site and scope — we'll show you how E.S. Wagner delivers it.