Large-Scale Salmon Enhancement Select a topic from the list below Mokelumne River Hatchery Merced River Hatchery Thermalito Afterbay Sacramento Winter Run Iron Gate Hatchery Fish Transport Trailers Net Pens Avila Beach Monterey Bay Rowdy Creek Hatchery, Smith River  Permanent Fish Ladder and Trap At Iron Gate Hatchery, before the Salmon Stamp Program stepped in, the spawner trap – where adult salmon spawners first enter a hatchery, attracted to the trap by water flowing from it – was located upstream from the rearing raceways. The arrangement had never worked well because returning spawners often were more attracted by the discharge water flowing from the hatchery raceways and lingered near this drain water outlet instead of swimming to the trap. The new ladder, located at the raceway drain and built with $60,000 from Salmon Stamp funds, has greatly increased the efficiency of Iron Gate Hatchery.