USGS Water-Year Summary for Site USGS 09380000

Click to hide Water-Year Summary instructions and information

Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
Not all sites have reports available for every water year.

	Available Parameters
	00010 Temperature, water(Mean)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Mean)

Select a water year

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

Print this page

USGS Water-Year Summary 2020

09380000 COLORADO RIVER AT LEES FERRY, AZ

LOCATION - Lat 36°51'51.60", long 111°35'16.34" referenced to North American Datum of 1983, Coconino County, AZ, Hydrologic Unit 14070006, on left bank at head of Marble Gorge at Lees Ferry, immediately above mouth of the Paria River, 28 miles downstream from the Utah state line, 16 miles downstream from Glen Canyon Dam, 61.5 miles upstream from the mouth of Little Colorado River, 87.4 miles upstream from gage near Grand Canyon, and 355 miles upstream from Hoover Dam. By road, it is 7 miles northeast of Marble Canyon and 130 miles north of Flagstaff.

DRAINAGE AREA - 111,800 mi². approximately, including 3,959 mi² in Great Divide Basin in southern Wyoming which is non-contributing (previously considered part of the Missouri River basin).

REVISIONS HISTORY - WSP 859: 1921-23. WSP 1313: 1914-21.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Jan. 1895 to current year. Estimates of monthly and annual discharge only for some periods, published in WSP 1313.

GAGE - Water-stage recorder. Datum of gage is 3,106.16 ft above sea level. Prior to Jan. 19, 1923, nonrecording gages or reference points within 400 ft of present gage, at different datums.

REMARKS - Records excellent. Flow regulated since Mar. 13, 1963, by Lake Powell, 16 mi upstream. Many diversions above Lake Powell for irrigation, municipal, and industrial use. No diversions or inflow between Lake Powell and the gage.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge since at least 1868, about 300,000 ft³/s July 7, 1884, gage height, 31.5 ft, present site and datum, from floodmark at mouth of Paria River, from rating curve extended above 120,000 ft³/s on basis of discharge computed for flood of June 18, 1921, for station near Grand Canyon.

EXTREMES FOR PERIOD OF RECORD - 1895-1962: Maximum discharge, 220,000 ft³/s, June 18, 1921, gage height, 26.5 ft, from floodmarks, from rating curve extended above 120,000 ft³/s on basis of discharge computed for station near Grand Canyon; minimum, 750 ft³/s, Dec. 27, 1924. 1963-Curent year: Maximum discharge, 97,300 ft³/s, June 29, 1983, gage height, 18.14 ft; minimum daily, 700 ft³/s, Jan. 23, 24, 1963, result of closing coffer dam at Glen Canyon Dam.

AVERAGE DISCHARGE FOR PERIOD OF RECORD - 51 years (water years 1912-62), 17,850 ft³/s, 12,930,000 acre-ft/yr.

DISCHARGE, CUBIC FEET PER SECOND
YEAR 2019-10-01 to 2020-09-30
DAILY MEAN VALUES
[e, Value has been estimated.]

Day	Oct
	2019
1	11,000
2	10,600
3	10,500
4	10,400
5	9,570
6	9,440
7	10,900
8	10,700
9	10,700
10	10,700
11	10,700
12	10,300
13	9,280
14	10,100
15	10,500
16	10,400
17	10,400
18	10,000
19	10,300
20	9,090
21	10,300
22	10,700
23	10,500
24	10,600
25	10,500
26	9,870
27	9,230
28	10,300
29	10,600
30	10,500
31	10,400
Total	319,100
Mean	10,290
Max	11000
Min	9090
Ac-ft	632,900

Day	Nov
2019
1	10,900
2	10,100
3	9,500
4	10,900
5	10,800
6	11,200
7	11,100
8	11,100
9	10,100
10	9,530
11	10,900
12	10,900
13	10,600
14	10,800
15	10,800
16	9,650
17	9,450
18	10,800
19	11,000
20	11,300
21	11,100
22	11,200
23	10,000
24	9,540
25	11,000
26	11,300
27	11,200
28	9,600
29	11,000
30	10,200
--
Total	317,600
Mean	10,590
Max	11300
Min	9450
Ac-ft	629,900

Day	Dec
2019
1	10,700
2	12,300
3	12,800
4	12,400
5	12,900
6	12,800
7	12,400
8	11,200
9	12,400
10	12,800
11	12,700
12	12,700
13	12,700
14	12,100
15	11,000
16	12,500
17	13,200
18	13,000
19	13,100
20	12,700
21	12,700
22	11,100
23	12,600
24	12,600
25	10,700
26	12,200
27	12,700
28	12,300
29	10,900
30	12,300
31	12,700
Total	381,200
Mean	12,300
Max	13200
Min	10700
Ac-ft	756,100

Day	Jan
2020
1	10,900
2	12,500
3	12,600
4	12,600
5	10,600
6	12,200
7	12,700
8	12,700
9	12,900
10	12,700
11	12,200
12	11,100
13	12,600
14	12,700
15	13,000
16	12,900
17	13,100
18	12,800
19	11,200
20	12,800
21	13,000
22	13,000
23	13,100
24	13,000
25	12,600
26	11,200
27	12,700
28	13,000
29	12,900
30	12,800
31	12,900
Total	387,000
Mean	12,480
Max	13100
Min	10600
Ac-ft	767,600

Day	Feb
2020
1	11,300
2	10,200
3	12,200
4	12,500
5	12,400
6	12,000
7	12,300
8	11,200
9	10,200
10	11,900
11	12,300
12	12,100
13	12,500
14	13,100
15	11,500
16	11,000
17	11,700
18	12,400
19	12,600
20	12,700
21	12,700
22	11,400
23	10,200
24	12,100
25	12,500
26	12,600
27	12,600
28	12,500
29	11,600
--
--
Total	346,300
Mean	11,940
Max	13100
Min	10200
Ac-ft	686,900

Day	Mar
2020
1	10,400
2	11,900
3	11,700
4	11,800
5	11,800
6	12,000
7	11,200
8	10,400
9	11,700
10	11,900
11	12,100
12	12,400
13	12,400
14	11,700
15	10,400
16	12,100
17	12,100
18	12,100
19	12,400
20	12,100
21	11,300
22	10,200
23	12,000
24	12,000
25	12,100
26	12,100
27	12,100
28	11,600
29	10,300
30	12,100
31	11,900
Total	362,300
Mean	11,690
Max	12400
Min	10200
Ac-ft	718,600

Day	Apr
2020
1	10,600
2	11,100
3	11,100
4	10,600
5	9,860
6	11,000
7	11,000
8	11,600
9	11,100
10	11,600
11	11,100
12	9,590
13	11,000
14	11,200
15	11,300
16	11,200
17	11,400
18	11,200
19	10,000
20	10,900
21	11,300
22	10,900
23	11,200
24	11,400
25	11,000
26	9,770
27	10,900
28	11,200
29	11,300
30	11,300
--
Total	328,700
Mean	10,960
Max	11600
Min	9590
Ac-ft	652,000

Day	May
2020
1	10,900
2	10,600
3	10,300
4	10,700
5	10,800
6	10,800
7	11,000
8	10,800
9	10,500
10	10,300
11	10,700
12	10,900
13	10,800
14	10,800
15	10,700
16	10,500
17	10,300
18	10,600
19	10,700
20	10,800
21	10,800
22	10,900
23	10,100
24	9,800
25	9,810
26	10,300
27	10,600
28	10,800
29	10,900
30	10,400
31	10,200
Total	328,100
Mean	10,580
Max	11000
Min	9800
Ac-ft	650,800

Day	Jun
2020
1	12,300
2	12,100
3	11,900
4	11,700
5	11,900
6	9,320
7	8,960
8	11,200
9	11,500
10	12,100
11	12,100
12	12,000
13	9,430
14	8,960
15	11,500
16	e12,300
17	11,900
18	11,700
19	11,900
20	9,390
21	8,920
22	11,500
23	12,100
24	12,000
25	11,900
26	11,900
27	9,380
28	8,880
29	11,500
30	12,200
--
Total	334,400
Mean	11,150
Max	12300
Min	8880
Ac-ft	663,400

Day	Jul
2020
1	13,200
2	13,700
3	13,700
4	10,000
5	9,470
6	12,800
7	13,600
8	13,400
9	13,500
10	13,700
11	10,100
12	9,430
13	13,000
14	13,600
15	13,500
16	13,500
17	13,700
18	10,000
19	9,470
20	13,100
21	14,000
22	13,800
23	13,800
24	14,100
25	10,200
26	9,670
27	13,200
28	13,700
29	13,700
30	13,800
31	13,600
Total	390,000
Mean	12,580
Max	14100
Min	9430
Ac-ft	773,600

Day	Aug
2020
1	11,400
2	11,000
3	14,700
4	15,500
5	15,600
6	15,400
7	15,700
8	11,600
9	11,100
10	15,000
11	15,700
12	15,300
13	15,500
14	15,900
15	12,100
16	11,100
17	15,600
18	16,500
19	15,500
20	15,600
21	15,300
22	11,600
23	11,000
24	14,700
25	15,400
26	15,300
27	15,100
28	15,400
29	11,700
30	11,100
31	13,900
Total	436,300
Mean	14,070
Max	16500
Min	11000
Ac-ft	865,400

Day	Sep
2020
1	11,000
2	10,600
3	10,700
4	10,700
5	10,700
6	9,900
7	9,470
8	10,700
9	10,900
10	10,800
11	10,800
12	10,800
13	9,460
14	10,400
15	10,600
16	10,800
17	10,600
18	10,900
19	10,800
20	9,460
21	10,500
22	10,700
23	10,900
24	10,900
25	10,800
26	10,700
27	9,530
28	10,600
29	10,900
30	10,900
--
Total	316,500
Mean	10,550
Max	11000
Min	9460
Ac-ft	627,800

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1922 - 2020, BY WATER YEAR (WY)
	Oct	Nov	Dec	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep
Mean	9,586	9,904	9,865	10,080	10,020	10,600	15,550	26,340	30,869	17,990	13,350	10,910
Max	29,230	24,770	25,019	26,270	26,740	24,910	47,800	82,630	94,860	65,300	30,750	34,180
(WY)	(1942)	(1985)	(1987)	(1987)	(1985)	(1997)	(1942)	(1952)	(1957)	(1957)	(1929)	(1927)
Min	1,000	1,000	1,019	1,153	4,008	3,054	1,017	1,010	1,001	977	1,005	1,006
(WY)	(1964)	(1964)	(1964)	(1964)	(1964)	(1963)	(1963)	(1963)	(1964)	(1964)	(1963)	(1963)

SUMMARY STATISTICS
	Water Year 2020		Water Years 1922 - 2020
Annual total	4,248,000
Annual mean	11,610		14,600
Highest annual mean			28,240	1984
Lowest annual mean			3,325	1964
Highest daily mean	16,500	Aug 18	124,000	Jun 12, 1957
Lowest daily mean	8,880	Jun 28	700.0	Jan 23, 1963
Annual 7-day minimum	10,110	Oct 14	932.9	Jul 14, 1964
Maximum peak flow			127,000	Jul 01, 1927
Maximum peak stage			21.15	Jun 12, 1952
Annual runoff (cfsm)	0.104		0.131
Annual runoff (inches)	1.41		1.77
10 percent exceeds	13,500		25,600
50 percent exceeds	11,200		11,100
90 percent exceeds	10,000		5,080

USGS Water-data graph for site USGS 09380000