Loree Estates Outfall Repair

Project Background

The City of Sammamish (City) is investigating an alternative discharge location for an existing stormwater outfall that discharges to a small tributary drainage to Kanim Creek (a tributary to Pine Lake Creek). A slope failure occurred downstream of the existing outfall location, and the existing infrastructure is located in a 23-foot-wide drainage easement between two homes. The proposed outfall shall relocate infrastructure into the City’s right-of-way and discharge to a more stable location. The City has identified the vicinity of the Kanim Creek culvert crossing at SE 19^th Street as a likely proposed outfall location. The purpose of this task order is to perform an alternatives analysis and identify a preferred solution for the outfall relocation. The figure below shows the vicinity map of Kanim Creek and potential stormwater discharge re-route location.

Timeline