Laserfiche WebLink
<br />,. <br /> <br />area is rural in nature and lightly populated except for the <br />City of Glendale with a population of about 800. Interstate <br />Highway No.5 runs generally along the left bank of the creek <br />for about 7 miles. County Road No. 12 runs to the right of the <br />creek from Azalea to Glendale. <br /> <br />2. Cow Creek Canyon <br /> <br />This reach is a rather remote area extending about 31 miles <br />downstream of Reuben. There are only a couple of residences in <br />this area. County Road No. 321 and a Southern Pacific Railroad <br />line parallel the creek. This is primarily a timber access <br />area, and recreational mining also occurs here. The creek <br />channel is about 200 feet wide and 25 feet deep, and along with <br />the adjacent road and railroad, essentially comprises the canyon <br />bottom. The canyon bottom is covered with rock, trees, and <br />brush. <br /> <br />3. Lower Cow Creek <br /> <br />\ <br />\ <br />! <br /> <br />This is a 7 mile reach in the vicinity of Riddle which flows <br />through a valley about 1 mile wide. The creek channel is about <br />200 feet wide and about 25 feet deep. The valley floor cover is <br />predominately open grassy areas, with brush and trees along the <br />creek banks. The area is rural in nature and lightly populated, <br />except for the city of Riddle with a population of about 1,200. <br />County Road No. 39 lies to the left of the creek, crossing the <br />creek near the upstream end of the reach and continuing on the <br />right side of the creek. The Southern Pacific Railroad line <br />lies to the left of the creek. <br /> <br />4. South Umpqua River <br /> <br />This is a 47 mile reach extending from the confluence of the <br />South Umpqua River with Cow Creek downstream to its confluence <br />with the North Umpqua River. The river channel is about 300 <br />feet wide and 30 feet deep. The valley which the river flows <br />through varies from several hundred feet to about 1 mile wide, <br />and is about two miles wide in the Garden Valley area where the <br />study terminates. This reach is typically agricultural oriented <br />with moderate population, except for the more densely populated <br />areas in and around cities. These areas and approximate <br />population are, in downstream order: Myrtle Creek-Tri City, <br />6,500; Winston-Dillard 4,500; Green District 3,000; Roseburg, <br />18,000. Valley floor cover varies from pastures, orchards, row <br />crops, to residential and industrial areas. <br /> <br />STUDY METHODS <br /> <br />The National Weather Service computer program DAMBRK (version B) <br />was used to model the dam failure flood. Computer runs were <br />performed by Douglas County Water Resources Survey on the <br />County's mainframe computer. <br /> <br />B 2 of 11 <br />