Hammersley Pump Station protects 160 farms, about 200 residential properties and two federal correctional facilities: it’s the sole drainage option for the Mountain Slough. The new pump station is able to move more than twice as much water as the old one, which had been in place for about 50 years. Instead of a centrifugal pump, the new screw pumps are able to move both water and fish safely through the station, while maintaining water required water levels in the area. Integral Engineering as the structural engineers for WSP, designed the structure of pump house and outfall. The pump house consists of heavy reinforced concrete foundation and inclined channels to suite the screw pump constructed on piles, as well as a reinforced masonry building on top. The outfall consists of heavy reinforced gate structure to also accommodate fish migration.