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Amazon Creek Enhancement(ACE) PE-HY File No.6512 <br /> . Project <br /> willow had been planted in areas that were not specified in the original design,but were <br /> to be evaluated for their effect with this analysis. The channel has been widened in <br /> several areas as proposed in the original designs. However, all areas tend to have <br /> sections that remain in their historic geometric condition,particularly areas at pipe <br /> outfalls. These channel contractions were left without transitions to and from the re- <br /> constructed channel. Bridge cross-sections, while modeled as unaltered sections, were <br /> actually altered to various degrees by channel excavation and installation of bike paths, <br /> grouted rip-rap, guide-walls and steel railings. Large, well-established willow bushes <br /> were also noted in various locations throughout the reach. Many of these bushes were <br /> located along the water's edge and were not modeled. It appears from viewing the <br /> channel that the capacity has not increased substantially other than the increase in off- <br /> channel storage area. This increase in storage could significantly reduce profiles to a <br /> certain extent. However, stages from large flood events and flood events with long <br /> durations may not be reduced from the previous situation. <br /> c. Photographic Comparison <br /> A photographic comparison of channel conditions from before and after construction was <br /> made. The emphasis of this effort was to compare changes in bridge conveyance. Four <br /> of the seven bridges within the study reach have been altered to accommodate the newly <br /> constructed bike path. The four altered bridges include: West 11th Avenue,Bertelsen <br /> Road,Beltline Road and Danebo Avenue. The following section presents the before and <br /> after construction photos of each of the four altered bridges. <br /> Date: 08/26/98 Page 3 Channel Maintenance Analysis <br /> CENWP-PE-HY;MTK <br />