Clinton Storage Facility

In January 2008, Onondaga County Executive Joanie Mahoney halted the construction of a sewage treatment facility in Armory Square. As an alternative, the County is now building this state-of-the-art, six and a half million gallon stormwater storage facility and simultaneously investing millions of dollars in green infrastructure throughout the City of Syracuse to capture stormwater before it enters our sewer system.

Facility Details:  The Clinton CSO Storage Facility Project is a 6.5 million gallon combined sewer overflow storage facility under construction in the parking area between the elevated rail tracks and Onondaga Creek just south of the Armory Square area of downtown Syracuse (formerly known as the Trolley Lot). During wet weather events, the facility’s three, parallel 18-foot diameter, underground storage tunnels capture flow from 9 combined sewer overflows (CSOs) in the vicinity of the former Trolley Lot. The wastewater is stored in the tunnels until it can be conveyed via the main interceptor sewer to the Syracuse Metropolitan Sewage Treatment Plant (Metro) for treatment. The off-site conveyance piping, which will transmit the flow to the facility, was installed under the Clinton CSO Phase 1 and 2A conveyances projects completed in 2009. There is additional on-site conveyance piping installed under this project to connect the existing sewers to the new facility. In addition to the tunnels, there is two above-ground structures located at either end (east and west) of the parking lot, which provide access to the tunnels and house the pumping, grit collection and odor control facilities.

Greening the Gray: To further enhance the sustainability of the facility, the project includes green infrastructure components. The stormwater runoff from the entire site that measures approximately 275,000 square feet (SF) or 6.3 acres will be managed by green infrastructure. The stormwater from the area surrounding the main structure on the western half of the site will be collected by a series of catch basins and stormwater piping that will outfall into two bio-retention basins. The bioretention basins will allow the stormwater to infiltrate into the ground rather than immediately runoff to the creek. In addition, stormwater runoff from the eastern half of the project site, to be restored as a parking area, will be directed to a subsurface collection facility and used to flush the storage tank to clear them of grit and debris that may have settled or been left behind after the stored combined sewage was transmitted to Metro.

Construction Update (March 2014): The Clinton CSO Storage Facility was placed on line on December 27, 2013. The first large event occurred on March 29, 2014 with nearly 2” of rainfall in the City of Syracuse as well as significant snow melt. The snowpack was concentrated with water due to the very wet late season snow storms. The Clinton Storage Facility functioned essentially as designed with the effluent pumps activating when the tank reached a preset level. The contractor is working on miscellaneous final work items. Site restoration began on April 1, 2014 with closure of the temporary parking and the start of final grading. Completion is scheduled for June 2014, however, the contractor will remain onsite for the duration of the Performance Period as required in the Contract Documents.

Recent presentation to the Onondaga County Legislature (PDF) 

Trolley Lot: When final paving is complete, the parking area will be restored.  Onondaga County is working closely with the City of Syracuse, the Armory Square Association, and the Downtown Committee of Syracuse to ensure that the ample parking available in Armory Square is open, accessible and well-marked throughout project construction.


Save the Rain project will cost $1 million less than revised estimate, Onondaga County legislators told – PS 2013 – Glenn Coin


Click here for a map of parking lots/garages in Downtown Syracuse 

**UPDATES: On April 1, 2014 the lot is closing for final restoration and paving. The lot will reopen in late June 2014.

Clinton Storage Photos December 2013

Clinton Storage Facility Construction Photos - June 2013 (facebook link)

VIDEO UPDATE (Dec 2013): Testing the storage facility flushing system at Clinton CSO Storage Facility in anticipation of facility start up!

Download Facility Specifications and Details Below:

Project Overview
Technical Specifications
Trolley Lot Closing

Related media: 9 WSYR – Trolley Lot Project is Full Steam Ahead in Downtown Syracuse – Cranes in the Air: Save the Rain   

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