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<br /> <br /> <br />"';~ <br /> <br />\1 <br />j <br /> <br /> <br />FIGURE 6. - Severe bank scour by Bear Creek at ".Vest Dartmouth Avenue and South Newland Street, May 9, <br />1973. Denver Post photograph by Bill Wunsch. <br /> <br />~, <br /> <br />scoured its banks laterally in many places and, <br />in overtopping its banks, caused sheet flooding <br />that silted cultivated fields, <br />Plum Creek itself scoured and destroyed <br />bridge abutments at Titan Road (east from the <br />Martin Marietta Corp., toward Louviers), at <br />Sedalia, on Douglas County Road 20 west of <br />Sedalia, and at Louviers. Near Titan Road <br />about 13 acres of land was badly eroded (E. E, <br />McGregor, written commun., 1973). Many <br />ranches along Plum Creek were isolated when <br />access roads were severed by scour (The Parker <br />Press, May 10, 1973), Scour undercut and col- <br />lapsed the center span of a railroad bridge at <br />the Du Pont Company plant in Louviers. Happy <br />Canyon Creek and its tributaries damaged cul- <br />verts and caused rockfalls in the Dawson For- <br />mation, <br />Abutments of the West Cherry Creek bridge <br />above Franktown, according to Maberry, were <br /> <br />I <br /> <br />destroyed by scour. The east abutment of the <br />main stem Cherry Creek bridge on West Parker <br />Road (Douglas County Road 8) was badly <br />scoured. Cherry Creek washed out the bridge <br />on the Parker-Castle Rock shortcut road and <br />deposited sediment over about 50-100 acres of <br />sod farms on its flood plain, It eroded its banks <br />slightly at Havana Street, about half a mile <br />downstream from Cherry Creek Dam. <br />County Line Road (Colorado Highway 470) <br />was closed between South University Boulevard <br />and Interstate 25 when Willow Creek washed <br />out twin 2-foot-diameter culverts and about 50 <br />feet of roadway. Maberry noted that countless <br />unnamed tributaries, normally dry washes, and <br />shallow drains did some damage by scouring <br />and rill erosion, even on nearly flat ground. He <br />also noted that much of the stream scour in <br />Douglas County coincided with the outsides of <br /> <br />9 <br />