GATE STRUCTURES FOR IRRIGATION CANALS. 



19 



set in a cut in cemented gravel 5 feet deep. The canal below the 

 structure is in this same class of material, so that it forms a natural 

 paving which does not erode easily. 



The Uinta County Irrigation Co. constructed this system under 

 the conditions of the Carey Act. This particular structure was built 

 by force account in 1911. The steel gates proper and fittings, which 

 were made in Denver, Colo., weigh 5,700 pounds. Cement cost 80 

 cents per hundred pounds f . o. b. Opal, a station on the Oregon Short 

 Line 60 miles by wagon from the work. Sand, water, and gravel 



Fig. 2. — Concrete portion of headgate, Highland Ditch Co., Colorado. 



were close at hand and cost nothing but the labor of one handling. 

 The cost of the structure was $820. 



HEADING, THE HIGHLAND DITCH CO., COLORADO. 



The heading for the inlet ditch of the Foothills Reservoir, located 

 in Boulder County, Colo., about 10 miles from Longmont, is a 

 good example of a diversion from a stream which is plentifully paved 

 with heavy cobblestones. (Fig. 2.) This paving forms a natural 



