The Metropolitan Sewerage District’s (MSD) Sanitary Sewer Improvements at Carrier Bridge will accommodate the continuous growth of western and southern areas of Buncombe County, and northern parts of Henderson County. The sewer improvements consist of two separate projects to be constructed within the next 4 years. These projects are essential for meeting the current and future wastewater flows (including wet weather events) and protecting the quality of the French Broad River.
Project No.1 - French Broad Interceptor at Amboy Road
This project is located along Lyman Street and the RADTIP Greenway. The project will replace approximately 1,100 feet of existing 48-inch and 54-inch reinforced concrete gravity sewer pipe with new 60-inch corrosion-resistant pipe (material TBD) and include a junction box for the Project No. 2 force main river crossings. The existing pipe, that was installed in 1966, is in poor condition and has deteriorated due to the release of hydrogen sulfide, a gas present in all domestic sewer systems. This line required a spot repair in January 2021.
This project is currently in the final design phase; however, material shortages will delay the start of construction. Construction is scheduled to start in Winter 2023, when the greenway usage is at its lowest and to account for pipe fabrication and delivery lead times.
This project will involve a large, temporary sewer bypass pumping and piping system that will require the greenway to be closed in the area of construction. Occasionally the southbound lane of Lyman Street will be closed for certain construction activities.
Project No.2 - Carrier Bridge Pump Station Replacement
This project is located just north of the existing pump station off Riverview Drive, next to the French Broad River Park. The project will replace the existing Carrier Bridge Pump Station, MSD’s largest pump station that was originally constructed in 1966. Many upgrades have been made throughout the years to maximize the pump station’s capacity (currently rated at 23 million gallons per day (MGD). The new pump station’s capacity is being increased to meet projected growth for the next 50 years and beyond. The replacement pump station is being designed for an initial capacity of 40 MGD with the capability for future expansion to 50 MGD with minor upgrades.
This project will involve a complete replacement of the existing pump station, approximately 800 feet of new 60-inch influent gravity sewer, and two 36-inch discharge force mains connecting to the Project No. 1 junction box. The station will be enclosed with an odor control system. This project is currently in design with construction plans to be complete by Summer 2023. Construction will follow in Fall 2023 and is anticipated to last for approximately 2 years. The French Broad River Park will remain open; however, construction activities may interfere with use.