They spawn in late winter to early spring. Usually some will be spawning in Feb. and continue into April.
The Skamania steelhead are named after the Skamania Fish Hatchery that is located on the North Fork of the Washougal River in the State of Washington. The Skamania Strain is derived from wild summer run fish taken from the Washougal River and Klickitat River starting in 1956. Some Cowlitz River fish were also used in the late 1950's. Eggs were cultured and stcoking started in 1959. The hatchery strain [Skamania ] were stocked to supplement the wild strain of summer steelhead and are used in the majority of the Columbia River Basin watershed.
Skamania have an adipose fin clip in order to keep them separate for ID from the Chambers Creek winter run steelhead. In the past they used a pectoral fin clip one year and then alternated with a pectoral /adipose clip the next year to distinguish year classes. They stopped this to only use the adipose clip as it is easier on the fish.
When the summer fish actually enter the river in the early summer months before the water gets too warm [55 F ro 65 F optimum ] the Skamania are very active especially toward chasing things up high in the water column or on the surface, and when hooked fight spectacular. When the water gets above 68 F they get lethargic and sluggish in order to conserve energy so if caught they tire quicker and do not fight as well. Same goes for winter run fish that enter in Oct. or November that are in optimum temps. of 42 F to 50 F, they fight like a crazed animal. Let the water drop below 40 F and get down into the mid to low 30's and they slow down.