01-9961 jo

DES MOINES RIVER BASIN
05481650 DES MOINES RIVER NEAR SAYLORVILLE, IOWA
LOCATION (REVISED).--Lat 41°40'50", long 93°40'07", near center of sec.5, T.79 N., R.24 W., Polk County, near
center of span on downstream side of bridge on county highway F42, 2.0 miles west of Saylorville, 2.1 miles
downstream from Rock Creek, 2.4 miles upstream from Beaver Creek, and at mile 211.6.
DRAINAGE AREA.--5,841 sq mi.
PERIOD OF RECORD.--October 1961 to September 1970.
GAGE.--Water-stage recorder. Datum of gage is 787.42 ft above mean sea level (levels by Corps of Engineers).
Prior to August 6, 1970, nonrecording gage at same site and datum.
AVERAGE DISCHARGE.--9 years, 2,416 cfs (5.62 inches per year, 1,750,000 acre-ft per year).
EXTREMES.--Maximums and minimums (discharge in cubic feet per second, gage height in feet):
Annual maximum discharge (*) and peak discharges above base (8,000 cfs), water years 1966-70
Date Time Disch. G.H.
Oct. 2, 1965 0800 *17,200 17.35
June 12, 1966 1900 15,900 16.79
June 13, 1967 0800 *21,000 18.70
June 19, 1967 0400 19,600 18.50
Wtr yr Date
1966 Sept.21, 1966
1967 Oct. 4, 1966
1968 Jan. 10, 1968
Date Time
June 30, 1968 1200
Disch. G.H.
4,550 10.04
Mar. 27, 1969 0700 21,800 19.25
Apr. 10, 1969 0700 16,600 17.87
Apr. 18, 1969 0700 *23,800 20.15
Annual minimum daily discharge, water years 1966-70
Wtr yr
1969
1970
Date
Feb. 25, 1969
Sept. 8-9, 1970
Date Time
July 2, 1969 0700
July 11, 1969 0400
July 31, 1969 0700
Disch.
20,700
21,000
14,100
G.H.
19.41
19.48
16.85
May 18, 1970 0200 «14,000 17.30
Period of record: Maximum discharge, 47,400 cfs Apr. 10, 1965 (gage height, 24.02 ft); minimum daily,
44 cfs Jan. 10, 1968.
Maximum stage since at least 1893, 24.5 ft June 24, 1954, from floodmarks (discharge, 60,000 cfs).
REMARKS.--Re
1966-70 are published in reports of the Geological Survey.
COOPERATION.--Forty-two discharge measurements furnished by Corps of Engine
5 ll',700 z',100 U600 ',710 370 1,200 6,370 Z.OZO 2,160 2,300
10 5,250 1,800 1,190 900 2,300 1,700 5,310 1,680 2,800 1,200
3 3,890 1,860 1,690 ,300 3,000 1,600 3,400 2,100 12,600 952
4 3,630 1,840 2,390 ,200 2,400 1,650 3,400 2,120 11,000 874
7 \'lll \M°0 I'ill 'C IToo0 !' 6 2 o° I'll0* \'l\l I'lll III
2,790 ,,620 2.0,0 630 800 ,,770 2,830 2,340 2.960
31 2,450 1,800 370 4,640 3,040 578
CFSM .98 .30 .28 .16 .22 .32 .69 .48 .61 .19
scharge
410
168
405 2
382
324
332
281
452
278 -
.07
.08
B2 IN 11.17 AC-FT 3,480,000