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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />. <br />I <br />I <br />. <br />I <br />I <br />I <br />I <br />II <br />I. <br /> <br />Existinq Drainaqe Structures <br /> <br />The existing drainage structureS <br /> <br />in the upper (northeastern) portion of the basin consists almost <br /> <br />solely of small to medium sized culverts beneath roads and streets, <br /> <br />The major exceptions to this general rule are approximately 16 <br /> <br />small "stockpond" type reservoirs and bridges ,over Cottonwood Creek <br /> <br />at Templeton Gap (Black Forest) Road, Cowpoke Road near Point 2, <br /> <br />and Woodmen Road near Point 4. In addition, a few defacto reser- <br /> <br />voirs have been created by construction of high road embankments <br /> <br />coupled with inadequately sized culverts. <br /> <br />In this upper basin, water flow is <br /> <br />in natural channels throughout. A few minor changes have been <br /> <br />made in the natural channels at the sites of bridges and other <br /> <br />structures, but these changes are minimal, At the locations of <br /> <br />the three major bridges, the main channel of Cottonwood Creek is <br /> <br />rather deeply incised, The openings of these three major bridges <br /> <br />are all adequate for the flow at those points, <br /> <br />Some consideration should be given <br /> <br />to reconstruction of the drainageway below the Templeton Gap Road. <br /> <br />Flow at this bridge is not smooth and the south abutment has been <br /> <br />undercut by erosion, The condition of the bridge foundation at <br /> <br />Woodmen Road is presently'excellent, since the bridge is relatively <br /> <br />new, The sharp bend in the channel requires further protection, <br /> <br />however, to prevent loss of the west abutment during a flood flow, <br /> <br />Specific problem areas were not to <br /> <br />be studied in the northeastern portion of the basin. However, <br /> <br />-18- <br />