Milton, WA

Bridge Point I-5 Seattle

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Industrial Development
Underground Stormwater Vault
Gravel pit converted to industrial park in Milton

AHBL provided structural engineering for an underground stormwater vault as part of a large 118-acre industrial development near I-5 and the Port of Tacoma in Milton. The vault measures approximately 115 feet wide by 950 feet long, with a storage depth of 16 feet and an overall height of 19 feet. Our engineers designed a pre-cast concrete plank system spanning between cast-in-place concrete walls, supported by interior concrete beams. Due to the sloping site, one end of the vault was above grade and visible. AHBL also coordinated with the MSE wall design and designed the Hylebos Culvert Foundation, specifying a pre-engineered culvert system and its foundation based on manufacturer-provided reactions.

 

Photos: Seven Maples Photography

Teaming Partners

  • Owner: Bridge Industrial
  • Architect: Nelson Worldwide
  • Contractor: Sierra Construction
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