Northwest Hydraulic Consultants, Inc. Share: Civil EngineeringComputer Applications/TechEnvironmental EngineeringHydrology/HydrogeologyWater/Wastewater Northwest Hydraulic Consultants, Inc. Visit Website 12787 Gateway Drive Tukwila, WA 98168 (206) 241-6000 (206) 439-2420 (fax) Map What's Nearby? Distance: 5 10 15 20 25 50 mi.