The effectiveness of stream habitat rehabilitation was evaluated in year one of an initiative requiring several years. The study used a staircase design in the treated (rehabilitated) watershed, the Keogh River, and an untreated (logged) watershed, the neighbouring Waukwaas
River. The study examined anadromous salmonid density, growth, smolt yield and survival rates associated with a variety of stream habitat structures and whole-river fertilization. Other
activities in the drainage include hillslope rehabilitation, road de-activation, and, eventually, riparian area restoration. Based on samples (electroshocking) to obtain fish population estimates, complex lateral debris jams had highest coho fry (Oncorhynchus kisutch) densities ( = 80
fry·100m-2), while boulder clusters had greatest steelhead parr (O. mykiss) abundance ( = 6 parr.·100m-2, or ca. one parr per boulder). However, results were not significantly different statistically among habitat structures, as a result of large variance among fish densities in structures, particularly steelhead fry and parr, due to the reduced and patchy recruitment among
treatment reaches coincident with extremely depressed steelhead adult run size over the past few years; additional monitoring is therefore essential. Stream flow and habitat type affected fish response to habitat structures...
McCubbing, D.J.F., Ward, B.R.. 1997. The Keogh and Waukwaas Rivers Paired Watershed Study for B.C.'s Watershed Restoration Program: Juvenile Salmonid Enumeration and Growth 1997. Ministry of Environment. Watershed Restoration Project Report. WRPR06