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<br />~ <br />~ <br />J <br />J <br />I <br />J <br />t <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3749 <br /> <br />BuRec-Progress Report #10 <br /> <br />As a project authorized for planning under the Colorado <br />River Water Quality Improvement Program, the Glenwood-Dotsero <br />Springs Unit has been the subject of geologic and hydrologic <br />studies by the Bureau of Reclamation. The Bureau has determined <br />that in the 16-mile reach between Dotsero and Glenwood, about <br />25,000 acre-feet of water and more than 500,000 tons of salt <br />enter the river annually. <br /> <br />About half of the salts come from eight identified springs <br />located approximately 2.5 miles downstream from Dotsero and 10 <br />springs located near Glenwood Springs. The remainder enters <br />unseen through the stream channel as groundwater inflow. <br /> <br />USGS-BLM-Groundwater Contribution <br /> <br />Measured base flow salt load in the Colorado River at Cameo <br />was 1,254,100 tons. The total average annual salt load for the <br />Colorado River at Cameo from 1966-75 was 1,510,000 tons. It is <br />estimated that 83% of the total average annual salt load is <br />contributed by groundwater sources. Relative to other Colorado <br />subbasins considered in this investigation, groundwater <br />contributions make up the largest part of the basin salt loads in <br />the headwaters of the Colorado River. <br /> <br />Measurements taken during December 1977, and January 1978, <br />identified salt loading in the Glenwood-Dotsero thermal spring <br />area at 535,800 tons per year. <br /> <br />-17- <br />