Jason Wagner, US Bureau of Reclamation From 2004 -2012, an entire new series of fish ladders was constructed at the continental United States' largest salmon hatchery. The new system is comprised of 5 fish ladder sections, to allow for passage upstream of the barrier weir for native salmon, as well as to the hatchery for the hatchery brood stock. The hydraulic design of the site was complicated, as it incorporated six different flow sources to provide a large attraction flow at the mouth of the ladder. In 2013, upgrades to the site earned the ASCE Sacramento Division's Small Job of the Year.