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I I I I I I' 1 I I II I I I I I 1 I I 1 10. Thornton Reach 2S -- Street Crossings and 173,700 (I) Street crossing improvements to reduce the flooding of streets and associated Channel Improvements Reach 2N -- Street Crossings 166,500 damages. II. Northglenn and Channel Improvements (2) Channel improvements which include channelization, channel lining, trickle 12. Adams County Reach 2SE n Channel Improvements 8,500 flow channels, check drop structures, storm sewers, etc. 13. Northglenn Reach IS n Street Crossings and 979,800 (3) Improvements to existing ponds, dam embankments, and spi IIways. Channel Improvements *Includes construction, contingency, engineering and construction services, and right-of-way acquisition. The recommended order of priority was established based 011 the present average annual damage and the improvement effectiveness. The lower items of priority are not critical to the phase of implementation and the lower priority items generally are located in the lower reaches of Grange Hall Creek at its tributaries where the population density is much lower. E. Recommendations This report represents the culmination of several studies on the flooding potential of Grange Hall Creek and its tributaries. The studies have included hydrologic studies, hydraulic studies, potential flood damage studies, flood plain improvemellt studies, cost evaluation studies, and other studies related to the above. The maill purpose of the studies on Grange Hall Creek was to develop feasible alternatives for consideration by Adams County, Northglenn, Thornton, and the U.D. and F.C.D. for possible implementation to eliminate existing and future flood hazards and to reduce flood damage costs associated with Grange Hall Creek. The preliminary design of the accepted alternative has been completed and is included as part of this report. The alternative selected for each reach of Grange Hall Creek and its tributaries consists in general of the following: 25