City of Tacoma
  Jefferson and Hood Street Surface Water Interceptor
Project Description


The City of Tacoma Environmental Services Department is undertaking improvements to provide additional surface water capacity to the downtown core intended to help address flooding in the lower downtown area and provide additional capacity for growth. The existing surface water conveyance system in the downtown core does not have sufficient capacity to convey the runoff generated during significant rain events. The City is proposing to construct a new surface water interceptor, and to construct a new outfall or retrofit an existing outfall for additional capacity. Collectively, these improvements are referred to as the Jefferson and Hood Street Surface Water Interceptor Project.

Planned improvements include:

•   Approximately 3,000 feet of new 48-inch and 60-inch (diameter to be verified during design via modeling) surface water conveyance pipe, including crossings of the BNSF rail corridor and a major City arterial / light-rail corridor, both of which are anticipated to be tunneled
•   A new surface water outfall OR retrofits to an existing outfall and associated conveyance piping