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Sediment deposition needs to be considered when designing a reservoir. This report presents estimates of the sediment discharge in Fortification Creek and the sedimentation rate of the proposed Rampart Reservoir located about 20 miles north of Craig in northwestern Colorado. Suspendedand bedload-sediment data collected on 31 days during water years 1986 and 1987 were used to estimate sediment discharge from stream discharge for the proposed reservoir site. Regression relations for suspended-sediment discharge to stream discharge were determined for snowmelt runoff and base-flow periods Stream discharge was recorded only during water years 1985-87 at the Fortification Creek streamflow-gaging station where the sediment data were collected. Because a longer term estimate of sediment discharge in Fortification Creek was needed to determine the sedimentation rate of the proposed reservoir, a record-extension technique was used to simulate stream discharge for Fortification Creek for water years 1954-84. The estimated mean annual suspended-sediment discharge in Fortification Creek at the gaging station was 17,800 tons for water years 1954-87. Bedload discharge was estimated to account for 2 percent of the total-sediment discharge; therefore, the estimated mean annual total-sediment discharge for the same period was about 18,200 tons. The 95-percent confidence interval for that estimate was 9,820 to 35,300 tons per year. The gaging station is downstream from the proposed damsite; the mean annual total-sediment discharge used to compute the sedimentation rate of the reservoir was assumed to be equal to 90 percent of the mean annual totalsediment discharge at the gaging station, or 16,400 tons. The reservoir storage capacity would decrease from an initial storage capacity of 12,133 acre-feet to about 11,000 acre-feet after 100 years at 100-percent trap efficiency. Using the 95-percent confidence interval of the mean annual totalsediment discharge, the storage capacity would range from 9,900 to 11,500 acre-feet after 100 years.

Sediment discharge in Fortification Creek and the effect of sedimentation rate on the proposed Rampart Reservoir, northwestern Colorado