USGS Water-Year Summary for Site USGS 11161000

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	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

11161000 San Lorenzo River at Santa Cruz, CA

LOCATION - Lat 36°59'27", long 122°01'51" referenced to North American Datum of 1927, Santa Cruz County, CA, Hydrologic Unit 18060015, in La Carbonera Grant, on right bank, in city of Santa Cruz Water Meter Repair compound, 0.3 mi upstream from bridge at intersection of State Highways 1 and 9, 1.0 mi north of Santa Cruz, and 2.4 mi upstream from mouth.

DRAINAGE AREA - 115 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1952 to September 1960, October 1987 to current year.

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 8.72 ft above NAVD of 1988 and 5.84 ft above NGVD of 1929. October 1952 to September 1960, water-stage recorder at site 0.1 mi downstream at different datum.

REMARKS - Low flow partially regulated by Loch Lomond Reservoir since 1961, capacity, 8,820 acre-ft, and by an inflatable fiber dam located 6.8 mi upstream from gage. Water is diverted 50 ft upstream from station by city of Santa Cruz for municipal supply; many small diversions upstream from station for domestic supply.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 30,400 ft³/s, Dec. 23, 1955, gage height, 23.10 ft, site and datum then in use, from rating curve extended above 4,500 ft³/s, on basis of slope-area measurement of peak flow; no flow for several days in 1955 and many days in 1960. Maximum gage height, 23.67 ft, Feb. 07, 2017.

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	3.80
2	3.88
3	3.90
4	5.87
5	6.63
6	6.63
7	6.58
8	6.38
9	6.34
10	6.50
11	6.81
12	6.89
13	7.17
14	7.62
15	6.45
16	4.05
17	3.78
18	3.89
19	3.73
20	6.76
21	21.9
22	27.9
23	17.3
24	304
25	793
26	122
27	61.0
28	44.2
29	36.4
30	32.0
31	29.4
Total	1,603
Mean	51.7
Max	793
Min	3.73
Ac-ft	3,179

Day	Nov
2021
1	34.3
2	48.8
3	31.0
4	27.2
5	24.4
6	22.0
7	20.0
8	18.9
9	96.7
10	65.8
11	45.0
12	35.9
13	27.2
14	24.2
15	22.4
16	21.9
17	21.0
18	19.8
19	19.3
20	18.3
21	17.5
22	17.3
23	16.9
24	15.5
25	14.6
26	14.7
27	15.5
28	15.5
29	15.5
30	15.6
--
Total	803
Mean	26.8
Max	96.7
Min	14.6
Ac-ft	1,592

Day	Dec
2021
1	16.3
2	17.5
3	17.7
4	17.7
5	17.7
6	17.6
7	17.2
8	15.0
9	16.1
10	15.9
11	15.1
12	25.0
13	2,940
14	1,340
15	471
16	1,460
17	514
18	317
19	e230
20	e175
21	144
22	246
23	1,230
24	1,240
25	846
26	806
27	849
28	612
29	649
30	695
31	454
Total	15,430
Mean	498
Max	2940
Min	15.0
Ac-ft	30,600

Day	Jan
2022
1	350
2	e279
3	259
4	325
5	258
6	223
7	201
8	183
9	165
10	150
11	138
12	129
13	121
14	116
15	109
16	105
17	101
18	96.5
19	91.2
20	85.6
21	81.8
22	78.1
23	74.5
24	71.8
25	71.2
26	69.1
27	66.3
28	63.8
29	60.7
30	58.1
31	56.7
Total	4,237
Mean	137
Max	350
Min	56.7
Ac-ft	8,405

Day	Feb
2022
1	56.8
2	61.3
3	60.3
4	58.7
5	55.4
6	54.2
7	50.9
8	45.5
9	45.0
10	43.7
11	42.3
12	41.1
13	39.3
14	37.8
15	38.0
16	37.1
17	35.9
18	34.3
19	34.0
20	33.6
21	34.0
22	33.9
23	33.6
24	32.5
25	31.7
26	31.3
27	31.0
28	30.3
--
--
--
Total	1,163
Mean	41.6
Max	61.3
Min	30.3
Ac-ft	2,308

Day	Mar
2022
1	30.0
2	29.6
3	29.6
4	29.8
5	30.2
6	32.3
7	47.9
8	39.7
9	36.5
10	35.9
11	34.2
12	32.9
13	32.8
14	32.7
15	32.5
16	32.4
17	32.3
18	31.2
19	30.8
20	32.2
21	30.9
22	30.6
23	29.4
24	28.5
25	28.3
26	28.9
27	30.0
28	120
29	64.4
30	39.2
31	34.1
Total	1,130
Mean	36.4
Max	120
Min	28.3
Ac-ft	2,241

Day	Apr
2022
1	31.1
2	28.1
3	26.9
4	25.2
5	24.2
6	23.6
7	26.7
8	25.3
9	21.2
10	20.7
11	26.5
12	27.5
13	26.3
14	24.4
15	25.3
16	76.5
17	53.4
18	34.5
19	34.5
20	29.0
21	82.9
22	58.4
23	42.2
24	34.8
25	31.2
26	29.0
27	28.1
28	26.9
29	26.3
30	25.9
--
Total	997
Mean	33.2
Max	82.9
Min	20.7
Ac-ft	1,976

Day	May
2022
1	24.9
2	23.4
3	22.8
4	22.6
5	22.0
6	21.8
7	21.0
8	20.6
9	20.6
10	20.8
11	20.9
12	19.6
13	18.6
14	18.3
15	18.2
16	17.1
17	17.3
18	17.8
19	16.5
20	15.4
21	15.1
22	15.6
23	15.6
24	14.2
25	13.9
26	13.6
27	14.1
28	14.4
29	15.0
30	15.1
31	13.1
Total	560
Mean	18.1
Max	24.9
Min	13.1
Ac-ft	1,111

Day	Jun
2022
1	13.0
2	e12.4
3	12.2
4	13.0
5	15.4
6	16.4
7	13.6
8	13.3
9	13.3
10	12.9
11	12.3
12	12.6
13	13.5
14	13.5
15	14.3
16	13.9
17	13.9
18	14.7
19	16.0
20	15.2
21	13.3
22	13.0
23	13.6
24	13.9
25	15.1
26	16.2
27	14.4
28	12.6
29	11.5
30	12.3
--
Total	411
Mean	13.7
Max	16.4
Min	11.5
Ac-ft	816

Day	Jul
2022
1	11.4
2	10.5
3	11.8
4	10.7
5	9.77
6	9.50
7	9.14
8	9.00
9	9.22
10	9.95
11	9.58
12	9.03
13	9.11
14	8.88
15	8.73
16	8.69
17	8.62
18	8.91
19	8.88
20	9.08
21	9.05
22	9.08
23	9.23
24	9.33
25	9.54
26	9.51
27	9.55
28	8.88
29	8.59
30	8.55
31	9.36
Total	291
Mean	9.39
Max	11.8
Min	8.55
Ac-ft	578

Day	Aug
2022
1	8.55
2	8.29
3	8.22
4	8.36
5	8.07
6	8.31
7	8.25
8	8.25
9	8.33
10	8.34
11	8.21
12	7.92
13	7.76
14	7.55
15	7.69
16	7.75
17	7.98
18	7.65
19	7.87
20	8.03
21	7.95
22	8.21
23	8.26
24	8.50
25	e8.71
26	8.62
27	8.61
28	8.78
29	8.98
30	8.79
31	8.66
Total	255
Mean	8.24
Max	8.98
Min	7.55
Ac-ft	507

Day	Sep
2022
1	8.47
2	8.41
3	8.22
4	8.36
5	8.78
6	8.60
7	8.59
8	8.40
9	8.47
10	8.76
11	9.18
12	8.63
13	8.30
14	8.65
15	9.76
16	9.05
17	9.03
18	30.8
19	56.5
20	27.0
21	16.8
22	9.36
23	8.46
24	7.61
25	8.37
26	7.81
27	8.20
28	7.89
29	8.11
30	8.17
--
Total	353
Mean	11.8
Max	56.5
Min	7.61
Ac-ft	700

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1953 - 2022, BY WATER YEAR (WY)
	Oct	Nov	Dec	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep
Mean	17.0	28.4	179	305	385	257	150	64.7	33.9	18.5	11.7	10.5
Max	97.4	86.1	1,366	1,673	2,652	999	1,017	213	137	67.2	39.9	40.4
(WY)	(2010)	(1998)	(1956)	(2017)	(1998)	(1995)	(1958)	(1998)	(1998)	(1998)	(1998)	(1959)
Min	1.83	3.45	7.30	5.51	15.3	16.8	15.7	7.57	2.93	1.48	.27	.92
(WY)	(1989)	(1991)	(1991)	(2014)	(1991)	(1988)	(2021)	(2014)	(2014)	(1988)	(1960)	(1988)

SUMMARY STATISTICS
	Water Year 2022		Water Years 1953 - 2022
Annual total	27,230
Annual mean	74.6		122.4
Highest annual mean			410.0	2017
Lowest annual mean			15.8	2014
Highest daily mean	2,940	Dec 13	17,400	Dec 23, 1955
Lowest daily mean	3.73	Oct 19	0.0	Sep 03, 1955
Annual 7-day minimum	5.18	Oct 14	0.0	Sep 20, 1960
Maximum peak flow	5,740	Dec 13	30,400	Dec 23, 1955
Maximum peak stage	17.16	Dec 13	23.67	Feb 07, 2017
Annual runoff (cfsm)	0.649		1.05
Annual runoff (inches)	8.81		14.2
10 percent exceeds	117.6		250.0
50 percent exceeds	19.3		25.7
90 percent exceeds	8.19		4.48

USGS Water-data graph for site USGS 11161000