32 BULLETIN 1017, U. S. DEPARTMENT OF AGRICULTURE. 
From the 130 storms 13 were selected for which the precipitation 
was exceptionally heavy over considerable area. The date, duration, 
and location of each storm and amount of precipitation at one sta- 
tion are shown in chronological order in Table 9. Three storms of 
maximum intensity for areas which vary in size from 300 to 35.000 
square miles were selected for more detailed study. Depth-area 
curves for these three storms are shown in figure 10. The run-off 
resulting from each of these three storms was measured at stream 
gaging stations at one or more points in the watershed. 
Table 9. — Storm precipitation on Red River watershed in the United States. 
Year. 
Date. 
Length 
of 
storm 
period. 
Total 
precipi- 
tation at 
center of 
storm. 
Location of storm center. 
Maximum 
24-hour 
precipi- 
tation at 
one 
ohserying 
station. 
1897 
June 27-29 
Julv 17-22 
Days. 
3 
6 
4 
8 
6 
3 
4 
3 
4 
4 
3 
• 4 
4 
Inches. 
4.66 
7.42 
8.18 
10.50 
6.93 
11.10 
3.91 
5.04 
2.58 
3.34 
3.84 
6.13 
9.02 
Inches. 
2.35 
1897 
Wild Rice, N. Dak 
5.86 
1899 
Aug. 17-20 
4.31 
1900.: 
Aug. 4-11 
3.15 
1908 . 
Aug. 26-31 
5.85 
1909 
July 20-22 
10.75 
1915 
June 10-13 
2.75 
1915 
June 26-28 
Mayyille, N. Dak 
3. 98 
1916 
Anr. 18-21 
2.26 
1916 
May 13-16 
Fullerton, N. Dak 
2.94 
1916 . 
June 28-30 
3.67 
1919 
June 20-23 
Cando, N. Dak 
5.30 
1919 
July 1-4 
4.92 
The storm of July 17-22, 1897, covered the entire Red River water- 
shed. The precipitation was the maximum of record during any 
storm covering the entire watershed and was maximum for any 
portion of the watershed 8,000 to 35,000 square miles in area. 
Isohyetals for the storm are shown in figure 11. Following this 
storm there occurred the highest stage of record at Grand Forks for 
July and August, and the total discharge of the river for August, 
1897, was the recorded maximum for August. Less than a month 
earlier than the July storm (June 27-29) another storm had occurred 
which. may have increased the run-off after July 17 in certain 
localities. 
During the storm of July 1 to 4, 1919, precipitation was the maxi- 
mum that has been recorded on areas of 2.000 to 8,000 square miles 
within the Red River basin. Isohyetals for this storm are shown 
in figure 12. This storm produced very high stages on Red Lake 
River. Thief River, Clearwater River. Roseau River, and Two Rivers, 
and caused heavy losses from drowned crops in eastern Marshall 
County and in Roseau County. Minn. Nine inches of rain fell in 
four days over an area of approximately 390 square miles. 
