USGS Water-Year Summary for Site USGS 11097000

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	Available Parameters
	00060 Discharge(Mean)

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Water year 2022: 2021-10-01 to 2022-09-30

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USGS Water-Year Summary 2022

11097000 Big Tujunga Creek below Hansen Dam, CA

LOCATION - Lat 34°15'13", long 118°23'17" referenced to North American Datum of 1927, Los Angeles County, CA, Hydrologic Unit 18070105, in Mission San Fernando Grant, in city of Los Angeles, on left bank of concrete outlet channel, 0.1 mi upstream from Glen Oaks Boulevard, 0.5 mi downstream from Hansen Dam, and 3 mi southeast of San Fernando.

DRAINAGE AREA - 153 mi².

REVISIONS HISTORY - WDR CA-84-1: 1978 (instantaneous maximum discharge). WDR CA-01-1: 1992.

SURFACE-WATER RECORDS

PERIOD OF RECORD - May 1932 to February 1938, August 1940 to current year. Monthly discharge only for some periods, published in WSP 1315-B. Prior to October 1975, published as "Tujunga Creek below Hansen Dam."

GAGE - Water-stage recorder and concrete-lined flood-control channel. Datum of gage is 945.75 ft above NAVD of 1988. See WSP 1735 for history of changes prior to Oct. 1, 1953.

COOPERATION - Records of diversion provided by Los Angeles County Department of Public Works.

REMARKS - Flow regulated since July 1931 by Big Tujunga Flood-Control Reservoir, capacity, 5,690 acre-ft, and since September 1940 by Hansen Flood-Control Reservoir, capacity, 25,450 acre-ft. Several small diversions for domestic use and irrigation. Since about 1948, Los Angeles County Department of Public Works has diverted water 0.3 mi upstream from gage to spreading grounds. See schematic diagram of San Gabriel River and Los Angeles River Basins available from the California Water Science Center.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge, 54,000 ft³/s, estimated, Mar. 2, 1938.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 15,200 ft³/s, Feb. 10, 1978, Mar. 2, 1983; maximum gage height, 7.64 ft, Mar. 2, 1983; no flow for many days in most years.

DISCHARGE, CUBIC FEET PER SECOND
YEAR 2021-10-01 to 2022-09-30
DAILY MEAN VALUES
[e, Value has been estimated.]

Day	Oct
	2021
1	0.00
2	0.00
3	0.00
4	0.00
5	0.00
6	0.00
7	0.00
8	0.00
9	0.00
10	0.00
11	0.00
12	0.00
13	0.00
14	0.00
15	0.00
16	0.00
17	0.00
18	0.00
19	0.00
20	0.00
21	0.00
22	0.00
23	0.00
24	0.00
25	0.00
26	0.00
27	0.00
28	0.00
29	0.00
30	0.00
31	0.00
Total	.000
Mean	.000
Max	0.00
Min	0.00
Ac-ft	.000

Day	Nov
2021
1	0.00
2	0.00
3	0.00
4	0.00
5	0.00
6	0.00
7	0.00
8	0.00
9	0.00
10	0.00
11	0.00
12	0.00
13	0.00
14	0.00
15	0.00
16	0.00
17	0.00
18	0.00
19	0.00
20	0.00
21	0.00
22	0.00
23	0.00
24	0.00
25	0.00
26	0.00
27	0.00
28	0.00
29	0.00
30	0.00
--
Total	.000
Mean	.000
Max	0.00
Min	0.00
Ac-ft	.000

Day	Dec
2021
1	0.00
2	0.00
3	0.00
4	0.00
5	0.00
6	0.00
7	0.00
8	0.00
9	0.00
10	0.00
11	0.00
12	0.00
13	0.00
14	0.00
15	0.00
16	0.00
17	0.00
18	0.00
19	0.00
20	0.00
21	0.00
22	0.00
23	0.00
24	0.00
25	0.00
26	0.00
27	0.00
28	0.00
29	0.00
30	0.00
31	0.00
Total	.000
Mean	.000
Max	0.00
Min	0.00
Ac-ft	.000

Day	Jan
2022
1	0.00
2	0.00
3	0.00
4	0.00
5	0.00
6	0.00
7	0.00
8	0.00
9	0.00
10	0.00
11	0.00
12	0.00
13	0.00
14	0.00
15	0.00
16	0.00
17	0.00
18	0.00
19	0.00
20	0.00
21	0.00
22	0.00
23	0.00
24	0.00
25	0.00
26	0.00
27	0.00
28	0.00
29	0.00
30	0.00
31	0.00
Total	.000
Mean	.000
Max	0.00
Min	0.00
Ac-ft	.000

Day	Feb
2022
1	0.00
2	0.00
3	0.00
4	0.00
5	0.00
6	0.00
7	0.00
8	0.00
9	0.00
10	0.00
11	0.00
12	0.00
13	0.00
14	0.00
15	0.00
16	0.00
17	0.00
18	0.00
19	0.00
20	0.00
21	0.00
22	0.00
23	0.00
24	0.00
25	0.00
26	0.00
27	0.00
28	0.00
--
--
--
Total	.000
Mean	.000
Max	0.00
Min	0.00
Ac-ft	.000

Day	Mar
2022
1	0.00
2	0.00
3	0.00
4	0.00
5	0.00
6	0.00
7	0.00
8	0.00
9	0.00
10	0.00
11	0.00
12	0.00
13	0.00
14	0.00
15	0.00
16	0.00
17	0.00
18	0.00
19	0.00
20	0.00
21	0.00
22	0.00
23	0.00
24	0.00
25	0.00
26	0.00
27	0.00
28	0.00
29	0.00
30	0.00
31	0.00
Total	.000
Mean	.000
Max	0.00
Min	0.00
Ac-ft	.000

Day	Apr
2022
1	0.00
2	0.00
3	0.00
4	0.00
5	0.00
6	0.00
7	0.00
8	0.00
9	0.00
10	0.00
11	0.00
12	0.00
13	0.00
14	e0.00
15	e0.00
16	e0.00
17	e0.00
18	e0.00
19	e0.00
20	e0.00
21	0.00
22	0.00
23	0.00
24	0.00
25	0.00
26	0.00
27	0.00
28	0.00
29	0.00
30	0.00
--
Total	.000
Mean	.000
Max	0.00
Min	0.00
Ac-ft	.000

Day	May
2022
1	0.00
2	0.00
3	0.00
4	0.00
5	0.00
6	0.00
7	0.00
8	0.00
9	0.00
10	0.00
11	0.00
12	0.00
13	0.00
14	0.00
15	0.00
16	0.00
17	0.00
18	0.00
19	0.00
20	0.00
21	0.00
22	0.00
23	0.00
24	0.00
25	0.00
26	0.00
27	0.00
28	0.00
29	0.00
30	0.00
31	0.00
Total	.000
Mean	.000
Max	0.00
Min	0.00
Ac-ft	.000

Day	Jun
2022
1	0.00
2	0.00
3	0.00
4	0.00
5	0.00
6	0.00
7	0.00
8	0.00
9	0.00
10	0.00
11	0.00
12	0.00
13	0.00
14	0.00
15	0.00
16	0.00
17	0.00
18	0.00
19	0.00
20	0.00
21	0.00
22	0.00
23	0.00
24	0.00
25	0.00
26	0.00
27	0.00
28	0.00
29	0.00
30	0.00
--
Total	.000
Mean	.000
Max	0.00
Min	0.00
Ac-ft	.000

Day	Jul
2022
1	0.00
2	0.00
3	0.00
4	0.00
5	0.00
6	0.00
7	0.00
8	0.00
9	0.00
10	0.00
11	0.00
12	0.00
13	0.00
14	0.00
15	0.00
16	0.00
17	0.00
18	0.00
19	0.00
20	0.00
21	0.00
22	0.00
23	0.00
24	0.00
25	0.00
26	0.00
27	0.00
28	0.00
29	0.00
30	0.00
31	0.00
Total	.000
Mean	.000
Max	0.00
Min	0.00
Ac-ft	.000

Day	Aug
2022
1	0.00
2	0.00
3	0.00
4	0.00
5	0.00
6	0.00
7	0.00
8	0.00
9	0.00
10	0.00
11	0.00
12	0.00
13	0.00
14	0.00
15	0.00
16	0.00
17	0.00
18	0.00
19	0.00
20	0.00
21	0.00
22	0.00
23	0.00
24	0.00
25	0.00
26	0.00
27	0.00
28	0.00
29	0.00
30	0.00
31	0.00
Total	.000
Mean	.000
Max	0.00
Min	0.00
Ac-ft	.000

Day	Sep
2022
1	0.00
2	0.00
3	0.00
4	0.00
5	0.00
6	0.00
7	0.00
8	0.00
9	0.00
10	0.00
11	0.00
12	0.00
13	0.00
14	0.00
15	0.00
16	0.00
17	0.00
18	0.00
19	0.00
20	0.00
21	0.00
22	0.00
23	0.00
24	0.00
25	0.00
26	0.00
27	0.00
28	0.00
29	0.00
30	0.00
--
Total	.000
Mean	.000
Max	0.00
Min	0.00
Ac-ft	.000

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1948 - 2022, BY WATER YEAR (WY)
	Oct	Nov	Dec	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep
Mean	1.98	5.92	5.37	44.3	83.7	67.2	27.0	20.6	7.46	2.20	2.06	2.35
Max	32.2	153	87.0	988	1,218	1,387	309	446	85.7	52.4	33.1	41.4
(WY)	(1984)	(1984)	(2011)	(2005)	(1993)	(1983)	(2011)	(1998)	(2005)	(1998)	(1998)	(1983)
Min	.000	.000	.000	.000	.000	.000	.000	.000	.000	.000	.000	.000
(WY)	(1948)	(1948)	(1950)	(1949)	(1949)	(1950)	(1950)	(1949)	(1948)	(1948)	(1948)	(1948)

SUMMARY STATISTICS
	Water Year 2022		Water Years 1948 - 2022
Annual total	0.0
Annual mean	0.0		22.2
Highest annual mean			224.0	1993
Lowest annual mean			0.0	1950
Highest daily mean	0.0	Oct 01	11,400	Mar 02, 1983
Lowest daily mean	0.0	Oct 01	0.0	Oct 01, 1947
Annual 7-day minimum	0.0	Oct 01	0.0	Oct 01, 1947
Maximum peak flow	0.08^a	Dec 14	15,200^a	Feb 10, 1978
Maximum peak stage	1.02	Dec 14	7.64	Mar 02, 1983
Annual runoff (cfsm)	0.0		0.145
Annual runoff (inches)	0.0		1.97
10 percent exceeds	0.0		18.0
50 percent exceeds	0.0		0.0
90 percent exceeds	0.0		0.0

^a Discharge affected by Regulation or Diversion

USGS Water-data graph for site USGS 11097000