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-a- 046:1 SYLLABUS -------- . Presented herein is the project report plan for the Pinon Canon Dam, a small detention dam to provide local flood protection for a po~tion of the city of Trinidad, Colorado, from flash floods origi- na'ving on Pinon Canon Arroyo; a tributary of Purgatoire River. Author- ization for construction of small flood control projects is contained in section 205 of the 1948 Flood Control Act (Public Law 858, 80th Con- gress, 2d Session), and as amended b.7 section 212 of the 1950 Flood Control Act (Public Law 516, 81st Congress, 2d Session). Authority for the preparation of this project report is contained in the 2d indorsement from the Office, Chief of Engineers, to letter SWKGC, Subject: "Preliminary Reconnaissance Report - Flood Control Construction under Section 205 of the Flood Control Act of 1948, Pinon Canon, Trinidad, Colorado," dated 16 May 1951. The principal features of the project plan include: a. A compacted earthen embankment approximately 675 feet in length with a maximum height of about 67 feet above the arroyo bottom. . b. An ungated outlet consisting of an inlet structure with trash rack, a 2-foot square reinforced concrete conduit 353 feet in length, and a stilling basin. c. A 75-foot wide spillway consisting of an ogee-shaped weir, a retaining wall adjacent to the embankment, and unlined approach and outflow channels. The construction of the project would require the acquisition of about 32 acres of land, including improvements; relocation of about 0.7 mile of a single-lane gravel road; and construction of a 20-foot long single-lane pile bent bridge. In accordance with the provisions of local cooperation specified in the authorizing legislation, the city of Trinidad has given satisfactory assurances that it will pro- vide all lands, easements, and rights-of-way for cOllilstruction of the project; hold and save the United States free from damage due to the construction works; and maintain and operate all the mrks after com- pletion. In addition the city of Trinidad has agreed to relocate the gravel rO'ad and construct the road bridge. It is estimated that the project could be constructed in approxi- mately 6 months at a total estimated cost of $175,000, of which ~)150,ooo is Federal cost and \~25,ooo is non-Federal cost. The annual maintenance and operation cost to be borne by local interests after completion of the project is estimated to be \)500. .