Ives Island Study PRELIMINARY Results

The slides below comprise the preliminary findings of USFWS personnel on the Ives Island study area (See slide 1). The study is a joint U.S. Fish and Wildlife, Oregon Department of Fish and Wildlife and Washington Department of Fish and Wildlife study of the effects of flow on chinook spawning below Bonneville Dam.

Findings so far show that:

• Lower River Tule Fall chinook salmon, lower river Bright Fall chinook and ESA listed Chum salmon spawn at this site.
• Bonneville Dam flow level determines the amount of spawning habitat available to these fish at this site.
• Flow level and fluctuating flow can eliminate spawning habitat, dewater redds and strand emerging juvenile salmon at this site.

The photos will take the longest to load. Some of the graphs from Excel look a little light - click on the thumbnail to see the graphs clearly.

Slide 1: Study Area	Slide 2: Study Area	Slide 3: Historic Photo	Slide 4: Ives Island with gage locations	Slide 5:
Slide 6: Bonneville Flow 97	Slide 7: 1997 spawning	Slide 8: Female Chum	Slide 9: Early 1998 flows	Slide 10: Location of index redd
Slide 11: Flow vs. depth at index redd	Slide 12: Bonneville average flow Fall 1998	Slide 13: 1998 Flow < 125kcfs w/redds observed	Slide 14: 1998 Flow at 125kcfs w/redds observed	Slide 15: 1998 Flow > 150kcfs w/redds observed
Slide 16: 1998 distribution of redds	Slide 17: BON hourly flows Dec. 1998	Slide 18: Flows and stranding March 1999	Slide 19: Flows and stranding April 1999	Slide 20: Flows and stranding May 1999
Slide 21: Flows and stranding June 1999	Slide 22: F&W personnel observing stranding	Slide 23: Bonneville average flow Fall 1999	Slide 24: 1999 observations of Tule Fall Chinook	Slide 25: View of spawning area
Slide 26: View of spawning area	Slide 27: Fish swimming in gravel	Slide 28: 1999 Flow at 125kcfs w/redds observed	Slide 29: 1999 Flow at 140kcfs w/redds observed	Slide 30: 1999 Flow at 150kcfs w/redds observed
Slide 31: 1999 Chum redds observed flow at 150kcfs	Slide 32: Flow less than 125kcfs	Slide 33: Flow at 125kcfs	Slide 34: Flow at 150 kcfs	Slide 35: 1998/1999 Chum overlaid on flow of 125kcfs
Slide 36: 1998/1999 Chum redds at different flow levels	Slide 37: 1998/1999 Fall Chinook redds at different flow levels	Slide 38: All redds at different flow levels