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Water quality degradation in the Alamosa River above and below Terrace reservoir <br />include mining (recent and historic) in the upper watershed, natural geological erosion <br />and acid rock drainage. These issues are being addressed by the Summitville Superfund <br />Site Clean Up. <br />The overall work and the structures placed in the river during construction have been <br />highly effective in stabilizing the river in the restoration of the channel downstream of <br />Gunbarrel Road. The restoration project has had a significant effect on streambank <br />erosion, with erosion rates reduced more than 80% (visual assessment). It is expected to <br />reduce even further as the woody riparian vegetation gets re-established. <br />In conclusion, and assuming that the bedload has decreased by 80% suggests the project <br />was successful in reducing 2,570 cubic yards or 3,855 tons of material per year from <br />entering the system. <br />Before treatment. 2002 After treatment and 2 runoff seasons (2006) <br />3 <br />