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Upper Amazon Creek <br />b) Guidelines for Tree and Shrub Plantings <br />This reach, from Snell Avenue to Fox Hollow Road, does not include guidelines, since it is <br />dominated by natives and already has a well - developed riparian forest. It may revegetate <br />passively. <br />3. Fox Hollow Road to Hilyard Street <br />a) Existing Conditions <br />There is fairly low plant diversity in this reach, with a mix of some native and many non - native, <br />invasive species. The most frequent plant is willow. The trees and shrubs are mostly on slopes. <br />The top of the bank is mowed annually. <br />WILLOW - COTTONWOOD RIPARIAN FOREST <br />Canopy <br />Dominant species <br />• Populus balsamifera ssp. tricho. Black cottonwood <br />• Salix lucida ssp. lasiandra Pacific willow <br />Woody Understory <br />Dominant species <br />• Crataegus douglasii <br />• Salix hookeriana <br />• Salix fluviatilis <br />• Salix scouleriana <br />• Salix sessilifolia <br />• Salix sitchensis <br />Black hawthorn <br />Hooker's willow <br />Columbia river willow <br />Scouler's willow <br />Soft - leaved willow <br />Sitka willow <br />b) Guidelines for Tree and Shrub Plantings <br />Notes <br />• Plan for a 400' section <br />• Plants not planted in clusters should be planted along the whole section in an even <br />spacing. <br />• If a species is included in more than one planting zone, a single cluster across both zones <br />can be displayed. <br />• To allow adequate conveyance, NO plants should be near bridges. Leave a distance of <br />approximately one bridge width on either side of the bridge implanted. Leave 20 feet <br />unplanted centering on each outfall. <br />10 <br />