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Admin Order 58-12-14
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Admin Order 58-12-14
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Last modified
11/7/2012 2:23:00 PM
Creation date
11/7/2012 2:09:00 PM
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City Recorder
CMO_Document_Type
Admin Orders
Document_Date
11/2/2012
Document_Number
58-12-14
Author
CRO
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SECTION 2 Study Area Characteristics <br />2.5.1.5 Highway 99 <br />This drainage system mainly consists of a long roadside ditch along Highway 99. This ditch <br />drains in a northwesterly direction and into the A -1 channel. The ditch is owned and maintained <br />by the Oregon Department of Transportation. <br />2.5.2 Wetlands <br />Most wetland features within the basin are associated with riparian areas adjacent to creeks and <br />open waterways. There are also a few wetland sites located primarily near the relatively <br />undeveloped northern and western portions of the basin outside the UGB. About 281 acres of <br />wetlands are identified in the basin in the National Wetland Inventory (NWI) which provides <br />basic data about the general characteristics and extent of wetlands in the nation. The NWI <br />identifies the general boundaries of wetlands; however, in many instances actual wetland <br />boundaries are more extensive than what is identified. About 54 percent of the NWI wetlands in <br />the basin are located outside the UGB, and the area outside the UGB represents about 42 percent <br />of the total basin area. <br />A Local Wetland Inventory (LWI) was conducted in 2005, and the wetland sites evaluated for <br />potential protection as part of the City and County's Goal 5 efforts. Several wetland sites in the <br />River Road Santa Clara basin are identified in the adopted 2007 Goal 5 Water Resources <br />Conservation Plan in the River Road Santa Clara basin and are protected in the form of the <br />Water Resources Conservation Overlay Zone adopted by the City of Eugene and Lane, including <br />setbacks ranging from 25 to 50 feet from the jurisdictional wetland boundary. <br />The River Road Santa Clara basin also includes several open water ponds; all located in the <br />general vicinity of the Northwest Expressway and /or Highway 99 North. These ponds are <br />identified in the adopted 2007 Goal 5 Water Resources Conservation Plan as Site E62: <br />Northwest Expressway Ponds. The Northwest Expressway ponds are located just south of <br />Maxwell Road and on both the east and west sides of the Northwest Expressway. The eastern <br />pond (Dianna's Pond) is within the River Road Santa Clara basin and is hydrologically <br />connected with Upper (or South) Flat Creek. The pond is a former borrow pit that currently <br />supports willow, black cottonwood, reed canary grass, rush and sedge as the predominant plant <br />species. The southern and eastern arms of the pond have healthy riparian strips, while much of <br />the rest of the banks are bare and eroding. <br />2.5.3 Public Piped Drainage System <br />Most of the existing development in this basin occurred prior to the City of Eugene having <br />jurisdiction over urban land use requirements and, as a consequence, this basin lacks a <br />stormwater pipe system found in the other basins. Only 94.5 miles of stormwater pipes exist in <br />this basin and 43 of these miles are located outside the UGB, mostly serving Mahlon Sweet <br />Airport. The piped system located within the UGB was constructed to serve more recent <br />development that was required to annex and develop to City of Eugene standards. See Map 5. <br />0:\25695978 Eugene RR -SC Final Basin P1an\Master P1anTINAL 2- 2010\Master_Plan 3- 11- 10_FINAL_ Word _Version.doc 2-16 <br />
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