Home Page  Assessment  Action Plan  Habitat Restoration  Monitoring  References   Salmonid Temperature Requirements1 Coho Salmon are listed in as an endangered species. Spring Chinook, Chum, Winter Steelhead, and Sea Run Cutthroat Trout runs are depressed. Fall Chinook runs are healthy and stable.   Spawning Water Temperature   Location  Migration Time  Spawning Time    Water Temperature  Fahrenheit  Centigrade Chinook- Fal   main stem and large tributaries Sept- Dec Oct- Jan 42.1 - 57.2   Chinook - Spring   upper main stem April - Jan Sept - Oct 42.1 - 57.2   Coho small tributaries  Sept - Jan Oct - Jan  39.9 - 57.2   Chum lower main stem and tributaries  Nov - Dec Nov - Dec 44.9 - 55   Steelhead - Winter small tributaries  with moderate grade  Nov - May Jan - May 39 - 48.9   Steelhead - Summer small tributaries  with moderate grade   May - Jul Jan - April 39 - 48.9   Cutthroat Trout small headwater tributaries  Jan - Oct Dec - Feb 42.8 - 62.6     Rearing Water Temperature    Juvenile Habitat Freshwater Residency Estuary Residency    Temperature   Fahrenheit   Centigrade Chinook- Fall deep water  in main river channel Days to 3 months  Extensive 5 - 6 months   Preferred =45.1-58.3 Growth stops =68.5 Lethal = 77.4   Preferred =4.4-14.5 Growth stops =14.4 Lethal = 25 Chinook - Spring deep water  in main river channel  Days to 3 months   Extensive 5 - 6 months    Preferred =45.1-58.3 Growth stops =68.5 Lethal = 77.4   Coho Pools in summer alcoves, ponds and pools with complex cover in winter  One year  Move through 2 - 9 days   Preferred =53.2-58.3 Growth stops =68.5 Lethal = 78.4    Chum   Hours to a few days  2 -3 2 days   Preferred =44.1-58.3 Growth stops =68.5 Lethal =  78.4   Steelhead - Winter Pools, riffles and runs of tributary streams; large woody debris preferred  2 - 3 years   Move through in days  Preferred =45.14-58.3 Growth stops =68.5 Lethal =  75.4   Steelhead - Summer Pools, riffles and runs of tributary streams; large woody debris preferred    2 - 3 years Move through in days   Preferred =45.14-58.3 Growth stops =68.5 Lethal =  75.4   Cutthroat Trout Low velocity ponds and side channels in winter  2 - 4 years  Used extensively by adults before upstream migration   Preferred =49.1-55.2 Growth stops = 68.5 Lethal =  73.4   1. adapted from Salmonid Habitat Requirements published by the Tillamook Bay National Estuary Project