W Washington St Watershed
Construction of the stormwater improvements on Phase 2 of the West Washington Street Drainage Improvements are being financed by the Clean Water State Revolving Fund (SRF). The SRF program is administered by the Illinois Environmental Protection Agency and receives a portion of its money to fund these types of projects from the U.S. Environmental Protection Agency. This project includes the construction of a 19-acre-feet detention basin, storm and sanitary sewer improvements, rain garden, bio-swales, and other water quality improvement features. Once complete, it will reduce flooding and improve water quality for area residents and businesses in the West Washington Street Watershed by filtering pollutants from stormwater runoff in the watershed. SRF programs operate in each state to provide communities the resources necessary to build, maintain, and improve the infrastructure that protects one of our most valuable resources: water.
The West Washington Street Watershed Drainage Improvement project consists of four phases that include detention basins, rain gardens and storm sewer pipe upgrades at multiple locations throughout the watershed. Once fully implemented, the project will improve the flood protection level in the watershed to a 40-year level.
West Washington Street – Phase 1. This phase of the project was completed in November 2014. The project included the construction of Preservation Pond and storm sewer and street improvements around the intersection of Washington Street and Russell Street. A total of 10 acre-feet of stormwater storage was provided in this phase of the project at a cost of $5.2 million.
West Washington Street – Phase 2. Final design of Phase 2 of the West Washington Street Drainage Improvements was completed in September 2016. The project is eligible for an Illinois EPA revolving loan, which would cover approximately $9 million of the $13.9 million project costs. Pending final loan approval and finalization of the financing plan, this phase of the project would be ready to bid in November or December of 2016.
The primary stormwater management features on Phase 2 are a 19-acre-feet detention basin along westbound Glenn Park Drive and a new storm sewer to connect Preservation Pond to the proposed Phase 2 detention basin. Once completed, the Phase 2 detention basin will operate together with Preservation Pond to reduce flooding in the watershed.
In addition to the flood control elements, the Phase 2 detention basin will feature park-like amenities, similar to Preservation Pond, including a gazebo and waterfall, decorative lighting and fencing, multi-use paths, stone columns, rock outcroppings, rain gardens/bio-retention and native plantings. The final design of Phase 2 will blend with the existing Glenn Park to make one large continuous green space that will become a community amenity.
The Phase 2 project also includes the installation of a new storm sewer along Columbia Avenue in order to connect Preservation Pond to the new detention basin at Glenn Park Drive. In addition, the installation of secondary storm sewers is required along Garfield Avenue, Draper Avenue, Carson Avenue, Miller Avenue, Fair Street, and parts of Washington Street in order to address smaller local flooding areas. The streets in these areas will be completely reconstructed with new concrete pavement, curb and gutter, street lighting, and sidewalks. The goal of this is to provide new street infrastructure in areas that are disturbed as part of the storm sewer installation work.
West Washington Street – Phase 3. Phase 3 of the project consists of a new storm system that will be extended from Preservation Pond to the flooding areas located to the south. Specifically, storm sewers will be extended along Edwin Street, Church Street, James Street, Park Street, University Avenue and Flora Drive where flooding occurs in the watershed. The storm sewers in Phase 3 will discharge into Preservation Pond and eventually into the Phase 2 detention basin. Final design for Phase 3 is estimated to be approximately $700,000 and the construction cost is estimated to be approximately $6.6 million. It is anticipated that this phase of the project will also be eligible for an Illinois EPA revolving loan in an amount of $7.3 million, which would fund the entire project.
West Washington Street – Phase 4. Phase 4 is a future phase of the West Washington Street project that provides drainage improvements near the Bradley Avenue/McKinley Avenue intersection to address flooding at that location. This phase of the project would require a detention basin similar in size to Preservation Pond. Storm sewer improvements would also be required to direct stormwater from the flooding areas into the new detention basin. Very early estimates indicate a cost of approximately $7.0 million for this phase.