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FY04 budget) is allocated toward this objective). Extremely accurate aerial maps/ <br /> topography of the river banks /borders are available as a base information platform for <br /> this work. <br /> 4.Study and jurisdictional discussion regarding revetments used for control of the <br /> McKenzie River, particularly at Cedar Creek. <br /> Several revetmenis have been built on the McKenzie River to furnish bank protection, <br /> and noticeably active deterioration has occurred both chronic and episodic fashion. <br /> Controversy surrounds whether (and if so, how) they should be maintained; many are <br /> locally sponsored. Federal and state agencies are questioning reliance on revetments in <br /> the context of other environmental requirements /concerns. Farm land and housing has <br /> been harmed to date, and USACE predicts that a similar (or lesser) floods to 1996 would <br /> now overtop the banks of the McKenzie and flow into Cedar Creek, potentially adversely <br /> affecting urbanized land in Springfield. It is surmised that further deterioration would <br /> create unknown future impacts on flood patterns, and other unknown "ripple" effects. <br /> There has been abundant discussion, but no consensus of strategy, about repair or <br /> remediation of this problem. The city forecasts at least two major impacts if the situation <br /> persists in an un- addressed fashion: 1) the McKenzie will more frequently overtop its <br /> banks and flow into Cedar Creek which could have a potential negative impact on <br /> hydraulics of City stormwater drainage to the Creek from the Thurston area; 2) the <br /> McKenzie could actually eventually shift its main stem to new routes, including the <br /> Cedar Creek area, which could have a direct impact on urbanized areas. The substantive <br /> jurisdictional issues described previously apply here. This situation is a microcosm of an <br /> important overarching problem elsewhere in the study area and throughout the <br /> Willamette basin. The study would develop information and analyze the potential threat <br /> of increased flooding in north Thurston and any potential impacts on ability to provide <br /> storm drainage services to the Thurston area if the revetments are allowed to continue to <br /> deteriorate. It would also analyze the direct threat to the urban area from the potential <br /> greater meandering of the McKenzie River with revetment deterioration. If such a threat <br /> or impact exists, the study would identify methods of lowering the threat or impact. <br /> City funding ($100,000 as a specifically targeted program line item is available in the <br /> FY04 budget) is allocated toward this objective — work is interrelated to #3 above. <br /> 5. Lower Springfield Millrace <br /> Segments of the Mill Race which do not support fish passage and/or lack a functional <br /> riparian area. The city believes it is in the public interest to improved conditions along <br /> the entire length of the Springfield Mill Race that will support the long range success of <br /> the in- progress Section 206 project, and help comply with federally mandated water <br /> quality programs. The primary elements of this study objective include acquiring and <br /> stormwater quality and quantity, and evaluating opportunities for the pretreatment of <br /> urban stormwater prior to its discharge to the Mill Race. The work would evaluate the <br /> bank and streambed conditions — erosion, invasive vegetation and stream substrate — and <br /> identify projects /solutions to improve and stabilize the lower reach of the Mill Race. <br /> 10 <br />