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<br />00164R
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<br />Append:bc B
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<br />I'DNTHLY SUMMARY OF DISCHARGE
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<br />Bighorn River at Bighorn, Montana
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<br />Location.--Lat 46008'50", long 107027'20", in NE~i sec. 33, T. 5 N.,
<br />R. 34 E., on right bank just downstream from bridge on U. S. Highway
<br />10, three-quarters of a mile upstream from mouth, 1 mile southwest of
<br />Bighorn, and 4 miles east of Custer.
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<br />Records available .--May 1945 to September 1957. Published as "near Custer"
<br />1945-55.
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<br />Gage.--Water-stage recorder. Prior to Oct. 7, 1955, water-stage recorder
<br />at site 4 miles upstream at different datum (May II to Dec. 6, 1945,
<br />wire-weight gage at same datum).
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<br />Average discharge.--12 years, 3,859 cfs (2,794,000 acre-ft per year).
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<br />Extremes.-Max:i..mum discharge during year, 20,000 cfs July 3; maximum
<br />gage height, 8.95 ft June 18 (backwater from Yellowstone River ); mini-
<br />mum daily discharge, 1,400 cfs Jan. 29.
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<br />1945-57: Maximum discharge, 26,200 cfs June 24, 1947 (gage height
<br />8.79 ft, site and datum then in use), from rating curve extended
<br />above 12,500 cfs by logarithmic plotting: maximum gage height recorded,
<br />10.65 ft, Mar. 20, 1947 (ice jam), site and datwn then in use; mini-
<br />mum discharge, 756 cfs Dec. 13, 1949.
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<br /> Second Runoff in
<br />Month foot days Maximum Minimur,l Hean Acre-feet
<br />October 1956 ,104,000 4,490 2,4W 3,355 206,300
<br />November 121,840 4,4i<D 3,400 4,061 241,1')0
<br />December 92,400 3,900 1,000 2,981 183,300
<br />January 1957 71,300 3,200 1,400 2,300 141,400
<br />February 73,400 3,400 1, 500 2,621 145,/':()0
<br />March 85,670 3,620 1,000 2,764 169,<;00
<br />April 88,030 10,200 2,070 2,934 174,/':()0
<br />May 165,O/':() 9,340 1,8/':() 5,325 327,400
<br />June 412,530 18, 500 8,710 13,750 818,200
<br />July 348,7W 20,300 4,830 11,250 691,000
<br />August 00,500 4,450 2,000 2,610 1/':(), 500
<br />September 1957 88.870 3,600 2, I/':() 2,962 176.300
<br />Water year 1956-57'
<br />1,732,7/':() 20,300 1,400 4,747 3,437,000
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<br />-13.
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