Daily discharge, in second-feet, of Minnesota River near Montevideo-Continued.

Feb. Mar. Apr. May. | June. July. Aug. Sept. Oct. Nov. Dec.

Daily discharge, in second-feet, of Minnesota River near Montevideo-Continued.

Day.

Jan.

Feb. Mar. Apr. May. June.

July. Aug. Sept.

Nov.
Oct.

Dec.

Daily discharges computed from a well-defined rating curve, except March 1-5 and Nov. 28-30, 1910, and March 1-7, 1911, which were estimated on account of ice, May 5-12, 1912, which were estimated from maximum stage observed and comparison of discharge at other stations on the river.

and

Monthly discharge of Minnesota River near Montevideo.

[Drainage area, 6,300 square miles.]

The year.

2,420

442

070

94

COBAAAAAAABD

Estimated from a few ice measurements, semi-weekly gage heights and com

parison with climatological data.

Monthly discharge of Minnesota River near Montevideo-Continued.

"Estimated from a few ice measurements, semi-weekly gage heights and comparison with climatological data.

MINNESOTA RIVER NEAR MANKATO.

Location.-At Sibley Park, 2 miles above the center of Mankato, and a few hundred yards below the mouth of Blue Earth River, the nearest tributary.

Records available.-May 20, 1903, to December 31, 1912. Since 1906 the gage heights have been furnished by the United States Weather Bureau. Drainage area.-14,600 square miles.

Gage. Chain maintained by the United States Engineer Corps; datum unchanged since established.

Channel. Shifting at intervals.

Discharge measurements.-Made from a boat and cable near the gage. Regulation. The nearest dam on the river is at Minnesota Falls, 140 miles upstream. There is no dam below the station. A dam on Blue Earth River at Rapidan, a few miles above the mouth, controls the flow of that river but its flow is such a small part of the entire discharge at the Mankato station that the effect of such control is very slight. Winter flow. From December to March, measurements are made through the ice to determine the winter discharge.

Maximum and minimum flow. -The highest known stage of the river occurred in 1881 and is shown by a well-marked line in Mankato. The stage was approximately 27 feet above the zero of the present gage.

This value was corroborated by Mr. M. B. Haynes, city engineer of Mankato, who states that the highwater occurred after the ice went out and was not caused by backwater. The corresponding discharge was approximately 65,000 second feet. Since the establishment of the gage the highest stage recorded was 21.2 feet on June 26, 1908. The lowest stage recorded was 0.5 in 1911 when the flow was 89 second-feet for three days. Accuracy.—Measurements made during the earlier years indicated changing conditions of flow, and accordingly the discharge for years previous to 1907 was obtained largely by the indirect method. These results can not be considered as accurate as the later ones which were based on a well-defined rating curve showing permanent channel, except during 1912, when the channel shifted again.

Day.

Daily discharge, in second-feet, of Minnesota River near Mankato.

Jan.

Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec.

Daily discharge, in second-feet, of Minnesota River near Mankato-Continued.

Day.

Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Νον. Dec.

2,160 3,400 1,18C 4,550 4,960 3,460 1,690 1,340 1,300
2,370 3,520 1,180 4.340 6,950 3,280 1,640 1,300 1,220,
2,640 3,340 1,220 4,150 7,460 3,160 1,610 1,260 1,260
3,830 3,280 1,510 3,960 9,400 2,930 1,560 1,220 1,220|
4,080 3,460 2,010 3,770 10,700 2,760 1,510 1,220 1,300

4,620 3,520 2,110 3,580 13,500 2,600 1,470 1,140 1,590
4,340 3,520 2,030 3,400 16,400 2,540 1,400 1,140 1,680.
3,100 17.700 2.390 1,400 1,140 1,860
2,980 18,600 2,280 1,370 1,100 1,950
2,860 17,100 2,180 1,340 1,220 1,950

3,830 3,460 1,920
3,580 3,340 1,870
2,980 3,100 2,320

2,320 2,800 3,400 2,750 16,600 2,100 1,340 1,140 1,950
2,210 2,640 4,620 2,700 14,900 2,050 1,340 1,100 1,950
2,530 2,480 5,040 2,530 16,300 1,960 1,260 1,060 1,900
1,730 2,320 6,090 2,480 12,200 1,960 1,220 1,100 1,900
1,920 2,210 7,730 2,320 11,100 1,960 1,300 1,260 1,860'

2,060 2,010,10,100 2,370 9,900 1,960 1,260 1,300 1,810
2,110 2,01011,500 2,530 9,150 1,380 1,300 1,300 1,720
2,210 1,920 11,900 2,420 8,180 1,960 1,300 1,340 1,720
3,700 1,820 11,700 2,530 7,820 1,960 2,930 1,260 1,680
4,340 1,730 11,500 2,480 7,270 1,870 2,200 1,340 1,680

4,900 1,640 11,000 2,420 6,760 1,820 1,950 1,340 1,630
5,180 1,510 10,100 2,260 6,450 1,380 1,900 1,380 1,590
5,620 1,460 9,290 2,210 5,960 1,680 1,810 1,420 1,540
5,620 1,460 8,110 2,160 5,540 2,260 1,720 1,420 1,860
5,480 1,380 7,380 3,040 5,400 2,120 1,540 1,380 1,500

5,180 1,380 6,710 4,080 5,120 1,940 1.460 1,380 1,500
4.760 1,300 6,710 4,760 4,720, 1,890 1,460 1,340 1,500
4,620 1,260 5,480 4,900 4,340 1,890 1,420 1,340 1,500
4,220 1,220 5,180 4,480 4,210 1,850 1,380 1,340 1,500 1,070
3,960 1,180 4,900 4,340 3,850 1,800 1,340 1,340 1,500
3,700

4.680

3,650 1,730

1,300

5,300 4,580 7,900 7,600 3,200 7,090 5,700 5,840 3,490 6,050 4,770 8,140 7,430 3,150 6,930 5,420 5,700 2,930 6,830 4,970 8,140 7,430 3,150 6,930 5,140 5,700 2,820 6,050 5,050 8,140 7,430 3.040 6,930 4,860 5,700 3,150 5,730 4,970 8,520 7,260 2,820 7,090 4,470 5,560 3,260

5,300 4,900 8,910 7,090 2,820 6,930 4,340 5,560 3,150
5,150 4,680 9,110 6,930 2,720 6,770 4,090 5,560 2,500
5,870 4,610 9.420 6,770 3,040 6,460 3,840 5,840
5,300 4,510 9,730 6,460 4,340 6,140 3,600 5,840
5,740 4,320 9,940 6,300 4,600 5,700 3,380 5,700

6,690 4,120 9,940 6,140 5,700 5,280 3,260 5,700
5,900 4,050 9,840 5,840 7,260 5,000 3,040 5,420
6,450 3,910 9,620 5,560 6,770 4,730 2,930 5,280
8,340 3,800 9,420 5,280 6,460 4,470 2,820 5,000
8,510 3,680 9,310 5,000 6,460 4,220 2,720 4,860

9,100 3,550 9,110 4,730 6,140 4,220 2,610 4,600
9,290 3,550 8,910 4.470 6,000 4,220 2,400 4,730
9.210 3,860 8,620 4,340 5,840 4,220 2,400 4,600
8.990 3.910 8,810 4,090 5,700 4,340 2,300 4,220
8,520 3,910 8,710 3,960 5,560 4,470 2,200 4,220