Restoration Plan for the Clark Fork River And the Blackfoot River Near Milltown Dam [electronic Resource] 2005 Appendix a
Restoration Plan for the Clark Fork River And the Blackfoot River Near Milltown Dam [electronic Resource] 2005 Appendix a
Montana.Natural Resource Damage Program
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The flood was estimated at 48,100 cfs and was greater than a 500 year event based on the updated flood frequency curve for the CFR gage above Missoula. Approximately 6,600,000 cubic yards of mine tailings and processing wastes from upstream mining operations were entrained by the CFR and its tributaries during this event. To alleviate hydrostatic pressure at Milltown Dam, operators dynamited the southern section of the structure to pass the flood waters. More recent flood events of hydrologic s...ignificance occurred in 1948, 1953, 1964, 1975 and 1981. Table A-2 provides a brief flood history for the CFR, including year, rank, and associated discharge and recurrence interval. RIVFR Group , A-3 V % W^WttV Cwmiflarift, Hk, Appendix A - Hydrology and Flood Series Analysis Restoration Plan for the Clark Fork River and Blackfoot River near Milltown Dam - October 2005 Table A-2. Flood history of the CFR above Missoula based on USGS gaging records. Recurrence Year Rank Discharge (cfs) Interval (yrs) 1908 1 48,100 500 1975 2 30,800 76 1964 3 30,500 38 1981 4 28,900 25 1948 5 28,800 19 1953 6 27,200 15 1997 7 26,400 13 1972 8 26,000 11 1976 9 24,800 10 1947 10 22,000 8 The BFR flood history is summarized in Table A-3, including year, rank, and associated discharge and recurrence interval.
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