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Southwest ND rivers broke streamflow records in August

Above-average precipitation in August led to record-breaking monthly streamflows throughout southwest North Dakota, the U.S. Geological Survey announced Thursday.

Above-average precipitation in August led to record-breaking monthly streamflows throughout southwest North Dakota, the U.S. Geological Survey announced Thursday.

Streamgages along the Green River, Heart River and Knife River recorded flows greater than what any of the rivers had seen in decades.

The Knife River at Hazen recorded 6½ times greater monthly mean flow than the previous record August in 1954 with 1,398 cubic feet per second. The only record was 215 cfs. The streamgage has been operating since 1937.

The Green River near New Hradec, which has been operating since 1964, had a monthly mean flow of 128 cfs, four times greater than the record of 29.5 set in August 1981.

Along the Heart River near Richardton, the preliminary monthly mean flow of 710 cfs was 1½ times greater than the previous record of 401 cfs set in August 1909. That site operated from 1903 to 1922, and has been in operation since April 1943.

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“It was an unusually wet August for southwest North Dakota, particularly in and near Hazen, New Hradec and Richardton,” Steve Robinson, associate director of the USGS North Dakota Water Science Center, said in a news release.

The streamgages provide flood monitoring data during hazardous weather, according to Robinson, and have been used to determine water supply and management, determine flood risk, and helps in bridge and road design, as well as with recreation.

The National Weather Service previously told The Press that last month was the wettest August on record at the Dickinson Theodore Roosevelt Regional Airport.

Related Topics: WEATHERHEART RIVER
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