Blue Line Light Rail Transit (BLRT) Extension Project

Minneapolis, Golden Valley, Robbinsdale, Crystal, and Brooklyn Park, Minnesota

The Blue Line Light Rail Transit (BLRT) extension continues the growth of the transit network in the Twin Cities and will provide transit improvements in the highly traveled northwest area of Hennepin County. The project will extend light-rail transit service approximately 14 miles from downtown Minneapolis, through the suburbs of Golden Valley, Robbinsdale, Crystal, and Brooklyn Park, terminating north of TH 610. Much of the proposed alignment is within an existing freight railway corridor.

SRF is leading the water resources design task as part of the larger consultant team. The stormwater management design includes:

  • Design of stormwater management BMPs that meet regulatory requirements and fit within the limited right-of-way. BMPs include bioretention basins, tree trenches, infiltration basins, wet sedimentation ponds, and underground detention systems.
  • Detailed hydrologic and hydraulic analysis of the existing stormwater systems that will be impacted by or cross the LRT corridor to determine impacts of the LRT project.
  • Floodplain mitigation within the Shingle Creek and Bassett Creek floodplains.
  • Hydraulic design of multiple new or reconstructed bridge crossings.

This work involves engaging stormwater regulators at the municipal, state, and watershed level to create the framework for the water resources design and facilitate the review and approval process. This coordination has continued through key stages in the design to discuss strategies for mitigating the project’s impacts to water resources, including floodplain and mitigation areas, the realignment of a portion of Bassett Creek in order to maintain adequate conveyance as demonstrated through HEC-RAS modeling, and stormwater treatment facilities.

Client: Metropolitan Council