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Communication at the NABS Annual meeting, Keystone, 2000
(83) AQUATIC ECOSYSTEM RESTORATION PROJECT ON A WESTERN OREGON MOUNTAIN STREAM.
R.C. Wildman, S.V. Gregory, and L.R. Ashkenas. Department of Fisheries and Wildlife, Oregon State University, Corvallis, OR, 97331
A stream restoration project was initiated at Quartz Creek in 1988 to study the changes in the geomorphic and biological attributes associated with the installation of log accumulations. The stream reach was intensively studied for 1 year before log installation and each year thereafter for 5 years. The stream reach was again monitored in 1996 and 1997, corresponding to before and after two major flood events in 1996. Changes in channel structure include the increase in pool habitat by 6% and an increase in side-channel habitat by 20%. Recruitment of wood by the installed accumulations was faster than expected. The restoration reach has developed the amounts and sizes of wood that would be expected in a stream flowing through old-growth forests in this basin. Retention of potential food resources, as measured by leaves, has approximately tripled. Channel bedform, measured at monumented cross-sections, changed at 28 of the 48 accumulations with 11 exhibiting downcutting and 17 exhibiting deposition. Differences in the degree of cabling (full, partial, and none) applied to the accumulations had no apparent effect on their persistence. Trout populations within the restoration site have been variable with an average increase of 21% greater than the populations in 1988.
Presented at 9:15 AM on Tuesday, May 30, 2000 in River and Stream Restoration
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