3000 E Storm Drain Outfall – 1140 S to Merrill Road
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The 3000 East Storm Drain Outfall project in St. George, Utah, is a privately funded expansion of the city’s stormwater system. Owned by the City of St. George, the project supports planned development along the 3000 East corridor, including a 205,000-square-foot retail complex and a 48-acre residential community.
The new storm drain consists of 3,145 linear feet of 10’x6′ reinforced concrete box culvert (RCB) and 53 feet of 16’x4′ RCB, all manufactured by Geneva Pipe and Precast. Running from 1140 South to Merrill Road, the alignment features four 22.5-degree bends and four 45-degree bends, accommodated with custom-fabricated elbow boxes. Geneva also supplied 15 – 60-inch diameter storm sewer manholes with flat floors, cones, and pre-installed rubber steps to provide safe maintenance access.
A total of 424 box culverts were supplied to complete the nearly 3,200-foot system. The 10’x6′ sections and elbows were dry cast at Geneva’s Orem plant, each weighing 31,200 and 40,000 pounds, respectively. The 16’x4′ sections were wet cast at the St. George plant and weighed 53,000 pounds each. Geneva maintained an average production pace of nine box sections per day to meet the project schedule, balancing on-site storage capacity with the delivery timeline.
Sunroc Corporation served as the installation contractor. Joints were sealed with rubber mastic, ensuring watertight connections in an area known for high groundwater levels. Soil stabilization and dewatering measures were implemented to address these site-specific challenges.
The new RCB connects to an existing 96-inch reinforced concrete pipe storm drain installed during the earlier 3000 East Improvement Project Phase 1, which included 2,440 linear feet of 96-inch RCP also supplied by Geneva.
As development continues in this area of St. George, the expanded stormwater infrastructure—constructed with high-performance precast components designed to meet the required flow capacity—will support long-term stormwater management and future growth.
