Chinook salmon spawn in the late summer and fall and die.
In the spring, their offspring use the runoff provided by snowmelt to migrate to the ocean.
CLICK TO VIEW THE BONNEVILLE FISH CAM A fish ladder, also known as a fishway, fish pass or fish steps, is a structure on or around artificial and natural barriers (such as dams, locks and waterfalls) to facilitate anadromous fish natural migration.
Most fishways enable fish to pass around the barriers by swimming and leaping up a series of relatively low steps into the waters on the other side.
This site shows what species of fish are migrating through the fish ladder of Bonneville Dam on the Columbia River.
The lines you see are used by fish counters to determine if a fish is a jack salmon or an adult salmon.
Juveniles spend the summer in fresh water and migrate to the ocean in the fall.They spend from one to four years in the ocean before returning to their spawning streams.Spawning occurs any time from late winter to late spring.They average 10 pounds and can grow as large as 42 pounds.Unlike salmon, steelhead do not necessarily die after spawning and a few may spawn several times.Electrical power generated at Bonneville is distributed by the Bonneville Power Administration. Benjamin Bonneville, an early explorer credited with charting much of the Oregon Trail.