1. Factors Limiting Columbia Gorge Chum Salmon US Fish and Wildlife Service Columbia River Fisheries Program Office February 2002

2. Chum had widest distribution of all Pacific salmon (~ 50% of annual biomass) Historic chum run in the early 1900s was ~1,400,000 By 1928, run size was ~700,000 adults In 1950s the run size had dropped to ~10,000 Since 1959, the population has been relatively stable with the annual minimum run size ranging from 300 to 5,700 Brief History

3. Adults

4. Hamilton Springs WeirHardy Creek Weir Spawning Ground SurveysRadio Telemetry

5. Date Live count and corresponding peak daily flow, 1998-2001

6. Typical male and female movement [50 m] [3600 m] [2000 m] Date

7. Hamilton Springs Hardy Creek Ives Island Pierce Island 3000m 2 2000m 2

8. Juveniles

9. D-Frame Fyke Net Floating Fyke Net Bismark Brown Photonic Dye Injection

10. Smolt emigration timing, 1997-2001 * * * Indicates Hamilton Springs data

11. 199819992000 2001 Smolt abundance estimates in Hardy Creek and Hamilton Springs, 1998- 2001 55* 203* 48* 50* 12* 26* * Indicates number of females in stream previous spawning season

12. Redd Caps

13. Habitat

15. Piezometers