USGS Water-Year Summary for Site USGS 09427520

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	00060 Discharge(Mean)

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Water year 2020: 2019-10-01 to 2020-09-30

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USGS Water-Year Summary 2020

09427520 COLORADO RIVER BELOW PARKER DAM, AZ-CA

LOCATION - Lat 34°17'44", long 114°08'22" referenced to North American Datum of 1927, in NW 1/4 NW 1/4 sec.03, T.2 N., R.27 E., San Bernardino County, CA, Hydrologic Unit 15030104, San Bernardino meridian, on north end of powerplant at Parker Dam, 13 mi northeast of Parker, AZ, and 14 mi upstream from Headgate Rock Dam.

DRAINAGE AREA - 182,700 mi² of which 4,000 mi² probably is noncontributing. in the Great Divide basin in southern Wyoming.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Feb. to Sept. 1934 (gage heights and fragmentary discharge records), Oct. 1934 to current year. Prior to Oct. 1937, published as near Parker, Ariz.

GAGE - Water-stage recorder.

REMARKS - Record is rated good. Flow regulated by Hoover Dam (Lake Mead) since Feb. 1, 1935, by Davis Dam (Lake Mohave) since Jan. 17, 1950, and by Parker Dam (Lake Havasu) since July 1, 1938. Many diversions above station.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 42,400 ft³/s Feb. 8, 1937; no flow at Parker Dam for parts of several days in 1942 when gates in dam were closed. An unregulated discharge of probably less than 1,350 ft³/s occurred Aug. 18, 1934 (lowest unregulated discharge since 1917 and probably since a much earlier date).

DISCHARGE, CUBIC FEET PER SECOND
YEAR 2019-10-01 to 2020-09-30
DAILY MEAN VALUES

Day	Oct
	2019
1	5,960
2	5,430
3	5,810
4	9,070
5	7,940
6	7,450
7	7,040
8	6,460
9	6,830
10	3,960
11	6,950
12	7,130
13	7,000
14	6,610
15	6,510
16	6,320
17	4,330
18	7,730
19	7,690
20	8,220
21	8,900
22	8,180
23	8,030
24	4,000
25	6,830
26	7,610
27	8,750
28	7,440
29	6,500
30	6,120
31	3,400
Total	210,200
Mean	6,781
Max	9070
Min	3400
Ac-ft	416,900

Day	Nov
2019
1	6,890
2	6,590
3	6,320
4	5,720
5	5,670
6	5,740
7	3,700
8	6,980
9	7,010
10	7,450
11	7,140
12	6,380
13	5,500
14	3,780
15	6,140
16	6,820
17	6,750
18	6,520
19	5,410
20	4,060
21	3,050
22	3,100
23	3,590
24	3,680
25	5,130
26	4,510
27	3,150
28	3,160
29	3,450
30	3,440
--
Total	156,800
Mean	5,228
Max	7450
Min	3050
Ac-ft	311,100

Day	Dec
2019
1	3,600
2	3,560
3	3,170
4	3,160
5	3,170
6	3,230
7	3,490
8	3,430
9	3,880
10	3,190
11	3,130
12	3,140
13	3,320
14	3,470
15	3,960
16	4,210
17	4,880
18	3,750
19	3,550
20	3,650
21	3,490
22	3,330
23	3,470
24	3,290
25	3,220
26	3,220
27	3,200
28	3,180
29	3,160
30	3,460
31	3,570
Total	107,500
Mean	3,469
Max	4880
Min	3130
Ac-ft	213,300

Day	Jan
2020
1	3,330
2	3,220
3	4,790
4	5,890
5	6,260
6	4,000
7	4,580
8	3,160
9	2,710
10	3,270
11	4,090
12	4,780
13	6,360
14	6,760
15	4,230
16	2,730
17	3,420
18	3,670
19	6,230
20	6,610
21	7,400
22	6,900
23	4,180
24	8,210
25	8,950
26	8,940
27	9,760
28	9,660
29	9,710
30	5,280
31	10,200
Total	179,300
Mean	5,783
Max	10200
Min	2710
Ac-ft	355,600

Day	Feb
2020
1	10,900
2	11,400
3	10,200
4	6,710
5	6,010
6	3,210
7	6,730
8	6,580
9	6,480
10	5,900
11	4,450
12	3,790
13	3,150
14	7,340
15	7,650
16	8,380
17	8,470
18	7,970
19	6,410
20	3,660
21	5,370
22	8,130
23	8,340
24	9,750
25	9,390
26	9,570
27	3,190
28	9,080
29	8,910
--
--
Total	207,100
Mean	7,141
Max	11400
Min	3150
Ac-ft	410,800

Day	Mar
2020
1	9,380
2	9,870
3	9,500
4	8,960
5	3,190
6	9,460
7	9,430
8	7,350
9	6,100
10	5,990
11	3,800
12	3,130
13	4,040
14	4,190
15	4,150
16	4,140
17	3,860
18	3,760
19	3,650
20	5,950
21	6,340
22	7,190
23	7,530
24	7,940
25	9,200
26	9,120
27	10,600
28	11,900
29	12,700
30	12,900
31	11,800
Total	227,100
Mean	7,326
Max	12900
Min	3130
Ac-ft	450,500

Day	Apr
2020
1	9,120
2	7,500
3	10,400
4	11,500
5	10,100
6	7,690
7	6,300
8	5,070
9	5,250
10	11,300
11	7,640
12	6,270
13	7,270
14	9,230
15	12,600
16	8,480
17	12,300
18	14,100
19	15,900
20	18,300
21	14,100
22	9,400
23	6,200
24	15,200
25	15,700
26	16,200
27	13,800
28	12,200
29	12,200
30	5,020
--
Total	316,300
Mean	10,550
Max	18300
Min	5020
Ac-ft	627,500

Day	May
2020
1	13,900
2	13,800
3	13,800
4	13,100
5	11,300
6	11,500
7	9,290
8	11,600
9	15,100
10	14,800
11	13,900
12	14,800
13	12,400
14	9,730
15	13,000
16	14,400
17	12,500
18	13,100
19	14,500
20	14,500
21	8,210
22	14,000
23	14,700
24	16,000
25	13,900
26	14,500
27	13,900
28	7,920
29	15,700
30	15,700
31	17,200
Total	412,800
Mean	13,310
Max	17200
Min	7920
Ac-ft	818,700

Day	Jun
2020
1	17,300
2	14,400
3	13,500
4	6,670
5	14,100
6	13,900
7	13,600
8	13,000
9	12,600
10	12,300
11	6,230
12	13,300
13	13,900
14	14,400
15	13,200
16	12,500
17	11,600
18	7,720
19	11,000
20	13,200
21	14,300
22	11,800
23	14,300
24	11,800
25	6,940
26	12,400
27	12,800
28	12,300
29	13,000
30	12,900
--
Total	371,000
Mean	12,360
Max	17300
Min	6230
Ac-ft	735,800

Day	Jul
2020
1	11,700
2	7,250
3	14,600
4	13,100
5	12,400
6	11,800
7	12,000
8	11,900
9	7,970
10	13,600
11	13,500
12	12,100
13	11,400
14	11,100
15	11,300
16	6,380
17	13,400
18	13,700
19	14,400
20	13,600
21	12,200
22	13,000
23	5,910
24	14,300
25	14,200
26	13,100
27	11,900
28	12,100
29	11,500
30	11,300
31	10,200
Total	366,900
Mean	11,840
Max	14600
Min	5910
Ac-ft	727,800

Day	Aug
2020
1	11,300
2	10,900
3	11,100
4	13,300
5	13,800
6	11,100
7	13,000
8	12,500
9	12,600
10	10,800
11	10,300
12	7,800
13	6,150
14	12,400
15	14,200
16	13,200
17	10,600
18	11,200
19	10,800
20	7,760
21	12,400
22	10,900
23	10,800
24	10,100
25	10,000
26	9,390
27	6,400
28	12,300
29	12,300
30	11,300
31	10,200
Total	340,900
Mean	11,000
Max	14200
Min	6150
Ac-ft	676,200

Day	Sep
2020
1	9,470
2	9,300
3	5,390
4	10,400
5	10,100
6	9,370
7	9,360
8	9,170
9	11,000
10	6,690
11	10,000
12	9,940
13	10,500
14	10,500
15	9,970
16	7,460
17	5,900
18	10,300
19	9,220
20	10,800
21	10,400
22	10,200
23	11,400
24	7,660
25	9,510
26	11,000
27	9,930
28	8,280
29	7,940
30	7,070
--
Total	278,200
Mean	9,274
Max	11400
Min	5390
Ac-ft	551,900

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1935 - 2020, BY WATER YEAR (WY)
	Oct	Nov	Dec	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep
Mean	9,878	8,609	8,404	8,906	10,390	12,700	13,640	13,000	14,080	14,520	13,250	11,720
Max	35,820	29,090	33,210	31,830	28,810	28,310	27,039	29,380	32,470	39,680	39,390	38,080
(WY)	(1984)	(1942)	(1942)	(1942)	(1984)	(1984)	(1984)	(1986)	(1984)	(1983)	(1983)	(1983)
Min	3,638	3,686	2,761	1,639	3,481	7,106	7,085	8,064	9,181	9,780	7,720	6,722
(WY)	(1973)	(1983)	(1968)	(1993)	(1993)	(1935)	(1935)	(1940)	(1937)	(1938)	(2014)	(1976)

SUMMARY STATISTICS
	Water Year 2020		Water Years 1935 - 2020
Annual total	3,174,000
Annual mean	8,673		11,630
Highest annual mean			29,100	1984
Lowest annual mean			7,552	1993
Highest daily mean	18,300	Apr 20	40,500	Aug 15, 1983
Lowest daily mean	2,710	Jan 09	30.0	Jan 05, 1995
Annual 7-day minimum	3,247	Dec 24	742.1	Jan 04, 1995
Maximum peak flow			42,400^a	Feb 08, 1937
Maximum peak stage			77.29	Jun 29, 1983
Annual runoff (cfsm)	0.048		0.064
Annual runoff (inches)	0.646		0.863
10 percent exceeds	13,900		18,400
50 percent exceeds	8,360		11,100
90 percent exceeds	3,467		5,180

^a Discharge affected by Regulation or Diversion

USGS Water-data graph for site USGS 09427520