Figures

Figure 1. Major tributaries and dams of the McKenzie River basin, Oregon.

Figure 2. Longitudinal profile of the McKenzie River showing reaches and basins, Oregon.

Figure 3. Geology of the McKenzie River basin, Oregon.

Figure 4. Mean monthly precipitation, McKenzie River basin, Oregon, 1971–2000.

Figure 5. Location of study reaches, McKenzie River, Oregon.

Figure 6. Dams, canal diversions, streamflow-gaging and stream-temperature stations in the McKenzie River basin, Oregon.

Figure 7. Daily mean streamflow in Reach 7 at McKenzie River near Vida, Oregon (14162500), water years 1925–2008.

Figure 8. Mean daily streamflow in Reach 1 at McKenzie River below Trail Bridge Dam, near Belknap Springs, Oregon (14158850), water years 1936–62 and 1963–2008.

Figure 9. Daily mean streamflow in Reach 1 at McKenzie River below Trail Bridge Dam, near Belknap Springs, Oregon (14158850), water year 1995.

Figure 10. Mean daily streamflow in Reach 3 below Cougar Dam at South Fork McKenzie River, near Rainbow, Oregon (14159500).

Figure 11. Daily mean streamflow in Reach 3 below Cougar Dam at South Fork McKenzie River, near Rainbow, Oregon (14159500), water year 1995.

Figure 12. Mean daily streamflow in Reach 5 below Blue River Dam at Blue River, near Blue River, Oregon (14162000 and 14162200).

Figure 13. Daily mean streamflow in Reach 5 below Blue River Dam at Blue River, near Blue River, Oregon (14162200), water year 1995.

Figure 14. Mean daily streamflow in Reach 7 at McKenzie River near Vida, Oregon (14162500).

Figure 15. Daily mean streamflow in Reach 7 at McKenzie River near Vida, Oregon (14162500), water year 1995.

Figure 16. Mean daily streamflow in Reach 8 at McKenzie River below Leaburg Dam, near Leaburg, Oregon (14163150) and Leaburg Canal.

Figure 17. Mean daily streamflow in Reach 10 at McKenzie River near Walterville, Oregon (14163900) and Walterville Canal.

Figure 18. Mean daily streamflow in Reach 12 at McKenzie River near Coburg, Oregon (14165500).

Figure 19. Daily mean streamflow in Reach 12 at McKenzie River near Coburg, Oregon (14165500), water year 1995.

Figure 20. Mean daily maximum stream temperatures in the upper McKenzie River basin (Reach 1), Oregon.

Figure 21. Mean daily maximum stream temperatures in the South Fork McKenzie River (Reach 3), Oregon.

Figure 22. Mean daily maximum stream temperatures in Blue River (Reach 5), Oregon.

Figure 23. Post-dam period mean daily maximum stream temperatures at monitoring stations on the McKenzie, South Fork McKenzie, and Blue Rivers, Oregon.

Figure 24. Study reach channel changes for 1939 and 2005, McKenzie River basin, Oregon.

Figure 25. Specific gage analyses for selected study reaches, McKenzie River basin, Oregon.

Figure 26. Channel changes at selected sites for upper, middle, and lower McKenzie River basin, Oregon, 1939 and 2005.

Figure 27. Constraints on channel change for the lower McKenzie River basin, Oregon.

Figure 28. Changes in flood-plain vegetation in the lower and middle McKenzie River basins, Oregon, 1939 and 2005.

Figure 29. Pool processes in relation to observed regulated and computed unregulated daily mean streamflow at the McKenzie River near Vida, Oregon (14162500), water year 1995.

Figure 30. Offchannel processes in relation to observed regulated and computed unregulated daily mean streamflow at the McKenzie River near Vida, Oregon (14162500), water year 1995.

Figure 31. Observed and computed unregulated daily mean streamflow in Reach 7 at McKenzie River near Vida, Oregon (14162500), water years 1925–2008.

Figure 32. Depositional processes in relation to observed regulated and computed unregulated daily mean streamflow at the McKenzie River near Vida, Oregon, (14162500), water year 1995.

Figure 33. Life history of two native aquatic species, one anadromous (Chinook salmon) and one resident (bull trout), in relation to pre- and post-dam mean monthly streamflow at McKenzie River near Vida, Oregon (14162500).

Figure 34. Life history of two resident native aquatic species, Oregon chub and Pacific lamprey, in relation to pre- and post-dam mean monthly streamflow at McKenzie River near Vida, Oregon (14162500).

Figure 35. Life history of two resident native offchannel species, western pond turtle and red-legged frog, in relation to pre- and post-dam mean monthly streamflow at McKenzie River near Vida, Oregon (14162500).

Figure 36. Life history of two native riparian vegetation species, black cottonwood and white alder, in relation to pre- and post-dam mean monthly streamflow at McKenzie River near Vida, Oregon (14162500).

First posted February 8, 2010