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LOG SILLS <br /> These complex coarse woody structures are constructed of whole trees found within the <br /> stream corridors and are most often constructed in conjunction with trout stream <br /> fshability projects and trout habitat improvement projects. <br /> Construction: <br /> Structure locations are most often in deep runs and pools at the outside bank of meander <br /> bends in water exceeding two feet of depth. The large butt sections are reoriented in a <br /> quartering downstream fashion and are anchored to either the streambank ors streambed. <br /> The medium sized material is placed on top of the largest materials and brush and/or <br /> small limbs are placed on top of the medium material. <br /> Dimensions: <br /> Length—Structure will begin on the established stable bank upstream of treatment site. <br /> The stream thalwag will enter the structure at the upstream third. The structure will again <br /> end on the established stable bank downstream of treatment site. <br /> Width—Less than 1/3 the stream width.Natural streambank curve/integrity will not be <br /> compromised. <br /> Height—streambed to no higher than the OHWM. <br /> Benefits: <br /> -provides complex woody cover habitat for adult fish <br /> -increases amount of anchoring substrate for aquatic invertebrates <br /> -allows high water to flow over and through which promotes sediment deposition within <br /> structure <br /> -provides ideal conditions for instream aquatic vegetation growth <br /> -increases streambank stability by protecting bank from full thalwag energy <br /> Log Sill 1 <br /> e <br /> . as <br /> �,. tom, ' s{ e <br /> `$a,.+ r. t gy ,•mom.: <br />