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KNIFE RIVER BASIN
06340000 SPRING CREEK AT ZAP, ND
LOCATION.--Lat 47×17'10", long 101×55'31", in SE14SE14SW14 sec.14, T.144 N., R.89 W., Mercer County, Hydrologic Unit 10130201, on left bank 250 ft downstream from Burlington Northern Railway bridge in Zap and 9 mi upstream from mouth.
DRAINAGE AREA.--549 mi2.
WATER-DISCHARGE RECORDS
PERIOD OF RECORD.--March to September 1924, October 1945 to current year.
GAGE.--Water-stage recorder. Datum of gage is 1,819.39 ft above National Geodetic Vertical Datum of 1929. Mar. 4 to Sept. 30, 1924, nonrecording gage at site 250 ft upstream at different datum. Oct. 1, 1945, to Sept. 30, 1947, nonrecording gage 250 ft upstream at datum 1.12 ft higher.
REMARKS.--Records good except for estimated daily discharges, which are poor. Flow slightly regulated by Lake Ilo, 56 mi upstream, capacity 7,130 acre-ft.
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum stage known occurred in about 1902, from ice jam. Floods of February 1913 and March 1943 reached a stage of about 20 ft and 19.5 ft, respectively, from information by local residents.
Discharge, cubic feet per second 
WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
DAILY MEAN VALUES
DAY
OCT
NOV
DEC
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
1
5.3
e14
e7.1
e6.9
e6.2
e8.1
67
13
10
6.0
5.2
6.0
2
5.6
e13
e7.2
e6.8
e6.1
e7.9
55
12
10
13
5.2
5.9
3
6.2
e12
e7.4
e6.7
e6.1
e7.6
46
11
9.3
8.4
5.1
6.0
4
6.4
e11
e7.3
e6.5
e6.0
e7.4
39
11
8.8
7.1
5.2
6.4
5
6.5
e10
e7.2
e6.3
e6.0
e7.8
33
11
8.7
6.8
5.1
6.4
6
6.4
e9.3
e7.3
e6.2
e6.1
e9.0
27
10
8.8
6.9
5.3
6.4
7
6.5
e8.7
e7.3
e6.0
e6.2
e11
23
10
8.0
6.5
5.5
6.4
8
7.0
e8.4
e7.2
e6.2
e6.2
e16
21
9.9
7.7
7.1
6.6
6.0
9
7.7
e8.2
e7.0
e6.4
e6.2
e30
19
9.7
7.5
8.0
6.8
6.5
10
8.9
e8.0
e6.4
e6.5
e6.3
e100
19
9.2
8.9
7.5
6.0
6.1
11
9.2
e7.7
e6.3
e6.5
e6.4
e80
18
9.5
12
7.3
6.0
6.2
12
9.7
e7.4
e6.6
e6.7
e6.3
e60
17
10
11
7.2
6.4
6.3
13
13
e7.3
e6.7
e6.8
e6.3
e48
17
10
9.6
7.1
6.1
6.6
14
14
e7.4
e6.9
e7.0
e6.3
e43
16
11
23
6.7
5.9
6.9
15
13
e7.4
e7.1
e7.1
e6.4
e42
17
10
25
6.8
5.6
6.8
16
15
e7.3
e7.3
e7.1
e6.5
52
15
9.9
16
7.2
5.5
6.6
17
13
e7.3
e7.3
e7.0
e6.6
73
14
9.8
13
7.0
5.4
6.5
18
12
e7.5
e7.4
e6.9
e6.8
91
15
9.7
11
6.8
16
6.3
19
13
e7.7
e7.4
e6.8
e6.9
150
15
10
9.4
6.3
13
6.1
20
11
e7.9
e7.4
e6.6
e7.0
193
15
9.8
8.6
6.8
10
6.5
21
12
e7.7
e7.4
e6.5
e7.2
215
15
9.5
7.7
7.6
7.9
6.9
22
12
e7.4
e7.5
e6.4
e7.4
182
15
9.3
7.5
7.1
7.3
6.8
23
13
e7.0
e7.6
e6.3
e7.6
139
15
9.2
7.1
6.8
6.8
6.7
24
14
e6.7
e7.6
e6.2
e7.8
130
14
9.6
6.7
6.5
6.8
6.8
25
14
e6.5
e7.5
e6.1
e8.0
137
13
10
6.5
6.1
6.4
6.4
26
14
e6.3
e7.4
e6.1
e8.3
142
12
9.9
6.3
5.8
6.2
5.8
27
17
e6.4
e7.3
e6.0
e8.5
158
12
9.9
6.6
5.5
6.4
6.1
28
18
e6.5
e7.3
e5.9
e8.5
151
11
10
6.4
5.4
7.2
5.8
29
18
e6.7
e7.2
e5.8
e8.3
116
10
10
6.1
5.4
7.1
5.3
30
e17
e7.0
e7.1
e5.9
---
85
11
9.9
6.1
5.4
6.1
5.2
31
e16
---
e7.0
e6.0
---
74
---
9.5
---
5.3
6.5
---
TOTAL
354.4
245.7
222.7
200.2
198.5
2,565.8
636
313.3
293.3
213.4
210.6
188.7
MEAN
11.4
8.19
7.18
6.46
6.84
82.8
21.2
10.1
9.78
6.88
6.79
6.29
MAX
18
14
7.6
7.1
8.5
215
67
13
25
13
16
6.9
MIN
5.3
6.3
6.3
5.8
6.0
7.4
10
9.2
6.1
5.3
5.1
5.2
AC-FT
703
487
442
397
394
5,090
1,260
621
582
423
418
374
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1924 - 2004, BY WATER YEAR (WY)
MEAN
10.6
9.77
6.73
5.81
26.3
160
132
35.8
41.2
24.8
10.9
7.72
MAX
74.4
51.9
21.2
30.6
183
933
1,044
292
290
178
53.2
16.5
(WY)
(1983)
(1983)
(1973)
(1973)
(1996)
(1972)
(1952)
(1970)
(1971)
(1962)
(1990)
(1986)
MIN
1.76
2.88
0.80
0.00
0.00
3.39
9.41
5.77
3.10
1.84
0.96
1.10
(WY)
(1959)
(1962)
(1962)
(1959)
(1949)
(1949)
(1992)
(1992)
(1961)
(1961)
(1961)
(1958)

SUMMARY STATISTICS
FOR 2003 CALENDAR YEAR
FOR 2004 WATER YEAR
WATER YEARS 1924 - 2004
ANNUAL TOTAL
12,024.3
5,642.6

ANNUAL MEAN
32.9
15.4
39.4
HIGHEST ANNUAL MEAN


99.5 1972
LOWEST ANNUAL MEAN


6.95 1961
HIGHEST DAILY MEAN
1,800 Mar 17
215 Mar 21
5,640 Apr  7, 1952
LOWEST DAILY MEAN
3.1 Sep  8
5.1 Aug  3
0.00 Jan 30, 1946
ANNUAL SEVEN-DAY MINIMUM
3.3 Sep  3
5.2 Jul 31
0.00 Jan 30, 1946
MAXIMUM PEAK FLOW

a245 Mar 21
b6,130 Apr  7, 1952
MAXIMUM PEAK STAGE

c6.88 Mar 10
20.70 Mar 15, 1972
INSTANTANEOUS LOW FLOW


0.00 Jan 30, 1946
ANNUAL RUNOFF (AC-FT)
23,850
11,190
28,520
10 PERCENT EXCEEDS
34
18
50
50 PERCENT EXCEEDS
7.3
7.4
8.9
90 PERCENT EXCEEDS
4.2
6.0
3.0

a Gage height, 6.09 ft
b Gage height, 20.03 ft
c Backwater from ice
e Estimated

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