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Mulberry Riverside Drainage Improvements and Cowan/Myrtle Waterline Replacement


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Storm drainage improvements will be installed in Cowan and Myrtle streets near Mulberry Street and Riverside Avenue. Construction of an outfall structure at the Poudre River near the Springer Natural Area is included. Preliminary access work near the natural area will begin this fall and extend into the summer.

The purpose of the drainage improvement project is to provide a new storm sewer and inlets to address localized drainage problems and reduce the effects of flood potential in the area during major storms. It is funded by the City of Fort Collins, State of Colorado and the Federal Emergency Management Agency (FEMA) as part of the federal Hazard Mitigation Grant Program (HMGP).

Drainage improvement work will be coordinated with a water line replacement project along Cowan and Myrtle streets. City crews will install 1,000 linear feet of new 8-inch PVC waterline to replace the existing 4-inch cast iron waterline. Construction should begin in January and continue through spring 2018. The waterline will be installed with open trenches and crews will work with residents to provide access. Residents will be notified in advance of any planned short-term water outages that may occur during construction.

Portions of the street will be repaved when construction is complete.

Drainage improvements will include:

  • Installation of 434 feet of 48-inch reinforced concrete pipe (RCP) from Myrtle and Cowan streets to Mulberry and Cowan streets
  • Extensions of existing storm sewers in Cowan and Myrtle streets
  • New inlets along Cowan Street, just north of the Myrtle and Cowan intersection
  • New inlets just south of Mulberry Street on the east and west sides of Cowan Street
  • New manholes, inlets and laterals to replace existing inlets near Lesser and Myrtle streets
  • New inlet laterals to replace existing laterals at Endicott and Myrtle streets
  • New inlets to replace existing inlets just north of Mulberry on either side of Cowan
  • Improved outfall into water quality pond at Springer Natural Area, including 50 feet of 48-inch RCP, two drop manholes, and a concrete outlet energy dissipator structure with riprap erosion protection
  • Maintenance access improvements from East Mulberry to proposed outfall in the Springer Natural Area
  • Landscape restoration of the natural area near the outfall
  • Manhole restoration at Riverside Avenue, including a 36-inch RCP culvert crossing
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