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<br />. <br /> <br />( <br /> <br />- 12 - <br /> <br />. <br /> <br />>. <br /> <br />Investigation of the railroad culvert during preliminary planning <br />.determined that enlargement or replacement was not feasible because of the <br />prohibitive costs involved. No proposal has been put forth by any agency <br />.for the enlargement of the.railroad culvert. Therefore,. the group ;. <br />-doing the channel improvement has concentrated on removing channel' <br />constrictions and making other channel improvements between the Grand <br />Valley Canal and the railroad, so that this reach will have a minUnum <br />capacity equivalent to the maximum capacity of the railroad culvert. <br />In addition, this group plans to incr~ase the channel capacity <br />downstream fram the railroad culvert to about 1,200 cubic feet per <br />second in order to handle any additional floodwater inflow to this reach <br />up to 200 cubic feet per second from the existing borrow ditches and <br />open drains. <br /> <br />( <br /> <br />Since June 1958, approximately $30,600 has been spent for: (l) <br />cleaning and shaping of the channel between the Grand Valley Canal <br />and North Avenue; (2) building revetments at two right-angle channel <br />turns along Orchard Road;' (3) installing a new highway culvert at North <br />Avenue; and (4) replacing the Mesa County Canal flume. The remaining <br />work, which will be completed prior to July 1962, involves an estimated <br />$43,000 for: (1) riprapping ch~nnel banks in a reach about 1,300 feet <br />long between Orchard Avenue and the E~ Avenue bridge; (2) replacing <br />the Kennedy Avenue bridge; (3) cleaning the channel from North Avenue <br />to the railroad to obtain 1,000 c.f.s. capacity and (4) cleaning the <br />channel to obtain 1,200 c.f.s. capacity from the railroad to the <br />Colorado River. <br /> <br />. <br /> <br />J\ <br /> <br />.. <br /> <br />This improvement group plans to operate and maintain the channel <br />in its improved condition as a flood prevention facility. <br /> <br />The City of Grand Junction has recently.'created a Department of <br />Development to carry forward planning for future development areas <br />in and adjacent to the city. This planning, together with existing <br />city ordinances, will provide a sound basis for future regulation of <br />stor.m drainage, storm sewer, and sanitary sewer requirements in both <br />existing and new subdivisions within the watershed area. <br /> <br />The presently proposed location of Interstate Highway 70 crosses <br />Indian Wash about 700 feet upstream fram and parallel to the High Line <br />Canal. If the proposed watershed project is approved for construction <br />and final designs are made prior to those of this section of Interstate <br />Highway 70, a definite saving can be made in the size of culverts <br />for the highway at Indian Wash. The proposed highway grade is about <br />six feet above the normal ground and will have some retarding effects <br />on flood peaks into the High Line Canal. <br /> <br />l <br /> <br />. <br />