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<br />stem of the water course. This occurs adjacent to Ogden Road, approxi- <br />mately in the center of section 2. From this point, the Arroyo travels <br />generally northwest and, in rapid succession, crosses Ogden Road in the <br />present al ignment, then the former al i~Jnment. The ct'ossing structure <br />under the present Ogden Road is a 72 inch di ameter' 01P, whil e the 01 der <br />facil ity is a wooden box culvert, with a 14 foot span and a height of <br />10 feet. Horizontal wooden croSS bracing within the opening is pro- <br />vided the length of the structure, 5.3 feet above the invert. <br />Approximately 1,200 feet downstream of the Ogden Road crossing, <br />Montrose Arroyo crosses a local road in a 96 inch diameter CMf' with <br />projecting ends, then flows into a smal~1 irrigation reservoir in the <br />northwest 1/4 of section 3. The reservoir is approximately 1,200 feet <br />long, with a maximum embankment height of 10 feet. A spillway with a <br />capacity of 15-20 cfs is provided. The embankment is of earthfi 11 <br />construction. <br />Several irrigation drainage ditches and minor tributaries ingress <br />Montrose Arroyo between the reservoi r and the fl ume under the <br />Loutenhizer Ditch. The Loutsenhizer crossing opening is 7 feet wide by <br />8 feet tall, with headwall provlded. <br />Additional irrigation drainage ditches flow to the Arroyo upstream <br />of the Niagara Road bridge. The crossing at Niagara has wooden walls, <br />with steel beams carrying the roadway. The openin!) is 15.7 feet wide <br />by 11 feet high, with wingwalls. <br />The reach of Montrose Arroyo from the upstream study 1 imit to <br />Niagara is characterized by moderately ilTegular channel sections in <br />clay soil, with a relative low degree of meanderin!). Clumps of grasses <br />and weeds lie in the main channel area and overbank growth is quite <br /> <br />8 <br />