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<br />2. Conduits, gates, operating mechanisms, riprap and headwalls are in <br />good condition. <br /> <br />3. Care is being exercised to prevent the accumulation of silt, debris, <br />and dumped material in ponding areas and trash and debris near the <br />structures; <br /> <br />4. Erosion is not occurring adjacent to the structures which might <br />endanger their water tightness and stability. <br /> <br />Immediate steps shall be taken to repair damage, replace missing or broken <br />parts, and remedy any adverse condition disclosed by such inspections. <br /> <br />4-03 Closure Structures. Stoplog closure structures are provided at the <br />levee intersections with U.S. Highway 50 and the A.T. & S.F. Railway Co's <br />tracks. Prior to their construction, agreements between the Holly Flood <br />Control, Drainage and Sanitation District, the project sponsor, and the <br />Colorado State Highway Department and the A.T. & S.F. Railway Co. were <br />executed on 23 April and 24 September 1979, respectively. These documents <br />give the sponsor the right to operate and maintain the closure structures and <br />to close them to highway and railroad traffic during flood emergencies. <br />Trial erection of the stoplogs is also allowed annually or when the sponsor <br />changes key operating personnel. Approval from ,railroad and highway <br />officials must be secured prior to effecting trial or emergency closures in <br />the manner prescribed by the signed agreements. A copy of each of these <br />documents is.included in Appendix B. <br /> <br />a. Operation. Erection of the stoplog closure structures shall begin <br />when flooding in Wild Horse Creek and the Arkansas River rises to elevation <br />3398.0, 2 feet below top of rail and 4.2 feet below the highway roadway, <br />respectively. Coordination with railroad and highway officials for traffic <br />interruptions shall begin as soon as the river starts rising, especially if <br />it is known that heavy rains are occurring in the streams' upper basins. <br />Preparation, consisting of mobilization of operating personnel, <br />transportation of logs, required hardware, tools, etc. from place of storage <br />to areas immediately adjacent to the structures should be done simultaneously <br />in order to accomplish closures before flooding conditions arrive. Closure <br />of the structures shall be done as follows: (See also Plate Nos. 2 and 3) <br /> <br />1. Highway 50 Closure Structure. <br /> <br />(a) place adequate signs at least 200 yards on either side of <br />the structure advising motorists that the road is closed. <br /> <br />(b) Remove a section of ~uardrail from either side of the <br /> <br />structure; <br /> <br />(c) Thoroughly clean areas where bottom stoplogs are to .rest and <br />level irregularities with sand or other adequate leveling material to provide <br />a straight base; <br /> <br />8 <br />