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. . . , , .' ,. ij,'U,,",",) BASALT PROJECT PROJECT PLAN. FEATURES. AND COSTS The potential Carboijdale Cartal would head on a natural channel about one mile below the outlet of Pissouri Heights Reservoir and would extend southwest 12.6 miles, crossing Roaring Fork River by siphon and providing water to lands in the Carbondale area. The canal would also intercept surplus flows of Prince Creek. The Sopris Canal would branch from the Carbondale Canal at the outlet of the Roaring Fork siphon and would con- vey water 8.3 miles southwest to West Sopris Creek to provide additional irrigation water to lands in the Sopris area. Some lands located above project works would receive project water by exchange. Existing irrigation systems are generally adequate to convey supple- mental project water to lands presently irrigated, but these systems would be enlarged as necessary. Some new laterals would be constructed to con- vey water to the additional lands that would be irrigated. Land drains would alSO be provided as needed. It is anticipated that a water conservancy district would be organ- ized under Colorado law as a contracting and administrative agency for the Basalt project. Construction Considerations A period of about four years is estimated to be required for the con- struction of the features of the Basalt project. This period is exclusive of the time required for the construction of the Ruedi Dam and Reservoir. The two construction programs cotud be carried out simultaneously, however. Reasonably good access is afforded to all features of the project Over existing transportation routes. Pro,ject Features Missouri Heights Dam and Reservoir enlargement ~~e Missouri Heights Dam and Reservoir enlargement would consist of raising the existing 23-foot-high dam approximately 44 feet to a total of 67 feet above streambed and increasing its crest length from about 1,600 feet to about 3,400 feet. The reservoir capacity would be increased from the present 2,800 acre-feet to 21.500 acre-feet, an increase of 18,700 acre-feet. The dam would be a rolled earthfill structure \,ith a layer of riprap on the upstream face and a section of gravel and rockf'ill on the downstream face. The outlet works would consist of a reinforced concrete conduit laid on undisturbed earth under the dam embankment. ~'o prevent seepage 13