The monitoring network within this area

Hydrionis holds 492 values from 2 gauges within it. Discharge is a property of a gauge and its reach, not of this drainage area, so this page reports the network and its records rather than a single figure.

Gauges

492

Values held

1902–2026

Record spans

Gauges within the Salinas huc8 subbasin

2 monitoring points, positioned as the publisher records them.

Flood peaks, as measured

This gauge's flood record, as measured. Unlike a daily mean it is the discharge at the moment the river was highest, which is the figure flood frequency analysis is built on.

Largest measured flow of each year at ARROYO SECO NR SOLEDAD CA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1906–2025.

Show relevant events (1 event)Shading marks when something was recorded, not what caused the line.

Published by the gauge's own operator from its sub-daily record; Hydrionis stores the figure rather than recomputing it. A year the gauge did not cover produces no value rather than a low one, and the gaps are stated below the chart. A peak is a property of this gauge and its reach: a larger flood upstream or downstream of it is not in this series.

What the shaded periods are (1 event)

A shaded period marks when something was recorded, not what caused the shape of the line. Where the two coincide, they coincided.

Documented record — A documented event, compiled from cited sources after it happened. The dates are as good as the record, which for older events can mean the month rather than the day.

Event	Type	Period	Standing	Authority
Hurricane Katrina water and sanitation collapse	Flood	2005-08-29 – 2005-09-30	Documented record	Compiled record

Not shown on this chart

The 1976 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
The 2022 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Yorkshire drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cantareira water crisis, São Paulo — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cape Town Day Zero — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
European drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.

View the data behind this chart

Underlying data
Period	ARROYO SECO NR SOLEDAD CA (m³/s)
1906	306
1907	303
1908	71.4
1909	210
1910	105
1911	490
1912	38.2
1913	53.8
1914	496
1915	204
1916	388
1917	453
1918	142
1919	164
1920	129
1921	241
1922	413
1924	53.8
1926	241
1928	164
1929	146
1930	130
1931	22.9
1933	66.3
1934	201
1935	236
1936	314
1937	345
1938	453
1939	39.1
1940	385
1941	300
1942	399
1943	456
1944	201
1945	597
1946	98.5
1948	27.5
1949	98.0
1950	240
1952	425
1954	88.3
1955	58.9
1957	140
1958	801
1959	173
1960	186
1962	292
1963	688
1964	137
1965	218
1966	784
1968	56.6
1969	674
1970	283
1971	129
1973	280
1974	173
1975	614
1976	22.7
1977	15.9
1978	592
1979	71.1
1980	391
1981	217
1982	459
1983	149
1985	144
1986	371
1987	154
1988	40.2
1990	85.5
1991	268
1992	172
1994	103
1995	773
1996	303
1997	234
1998	490
1999	165
2000	238
2001	168
2002	354
2004	229
2005	247
2007	28.9
2008	360
2009	129
2011	340
2012	106
2014	53.5
2015	108
2016	232
2017	513
2018	192
2019	479
2021	360
2023	869
2024	211
2025	185

About this series

Everything below is a property of the data rather than a rating of it. There is deliberately no single confidence score: how much a gap matters depends on what you are about to do with the series, and only you know that.

Source	United States Geological Survey — National Water Information System · US Government work — public domain
How the values came to exist	Measured
Period held	1906–2025
Completeness	83.3% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	20 separate periods inside 1906–2025 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1906 and is not continuous from it: 120 years separate the first value from the last, and 83% of the years between them are held. The span is not the record.
Last read from the publisher	2026-08-31
Redistribution	Permitted by the upstream licences
Commercial reuse	Permitted by the upstream licences. No Hydrionis access tier can widen this.
Methodology	How this was produced

How much of the rain came back out

A discharge in cubic metres per second cannot be compared with anything: the larger number may only mean the larger catchment. Divided by the area draining to the gauge it becomes a depth of water over that land, which answers a question a reader already has — of the rain that fell here, how much came back out as river?

Water leaving the catchment above ARROYO SECO NR SOLEDAD CA, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1902–2024.

Show relevant events (1 event)Shading marks when something was recorded, not what caused the line.

Computed by Hydrionis from the published annual mean flow and the catchment area the station's own publisher states. It is not a water balance: the difference between rainfall and runoff is not evaporation alone but also change in groundwater storage, water abstracted and taken elsewhere, and water imported by transfer schemes — which is why a catchment can yield more runoff than the rain that fell on it without anything being measured wrongly. A different area figure rescales every value here by the ratio between them.

What the shaded periods are (1 event)

A shaded period marks when something was recorded, not what caused the shape of the line. Where the two coincide, they coincided.

Documented record — A documented event, compiled from cited sources after it happened. The dates are as good as the record, which for older events can mean the month rather than the day.

Event	Type	Period	Standing	Authority
Hurricane Katrina water and sanitation collapse	Flood	2005-08-29 – 2005-09-30	Documented record	Compiled record

Not shown on this chart

The 1976 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
The 2022 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Yorkshire drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cantareira water crisis, São Paulo — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cape Town Day Zero — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
European drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.

View the data behind this chart

Underlying data
Period	ARROYO SECO NR SOLEDAD CA (mm)
1902	197
1903	194
1904	133
1905	225
1906	458
1907	573
1908	129
1909	489
1910	139
1911	572
1912	66.0
1913	64.0
1914	493
1915	409
1916	522
1917	255
1918	156
1919	135
1920	96.0
1921	210
1922	393
1923	168
1924	42.0
1925	96.0
1926	364
1927	268
1928	149
1929	85.0
1930	92.0
1931	114
1932	177
1933	72.0
1934	126
1935	177
1936	238
1937	335
1938	587
1939	41.0
1940	420
1941	735
1942	296
1943	249
1944	183
1945	271
1946	96.0
1947	41.0
1948	46.0
1949	100
1950	205
1951	111
1952	398
1953	107
1954	98.0
1955	204
1956	211
1957	98.0
1958	564
1959	111
1960	80.0
1961	35.0
1962	199
1963	392
1964	86.0
1965	191
1966	179
1967	313
1968	48.0
1969	594
1970	235
1971	80.0
1972	77.0
1973	436
1974	263
1975	309
1976	17.0
1977	50.0
1978	593
1979	250
1980	548
1981	212
1982	552
1983	986
1984	97.0
1985	93.0
1986	436
1987	64.0
1988	41.0
1989	38.0
1990	25.0
1991	100
1992	153
1993	409
1994	57.0
1995	560
1996	310
1997	284
1998	615
1999	123
2000	222
2001	189
2002	142
2003	132
2004	141
2005	414
2006	348
2007	29.0
2008	170
2009	199
2010	361
2011	354
2012	122
2013	39.0
2014	44.0
2015	38.0
2016	126
2017	563
2018	96.0
2019	463
2020	75.0
2021	121
2022	83.0
2023	628
2024	232

About this series

Source	United States Geological Survey — National Water Information System · US Government work — public domain
How the values came to exist	Derived Computed by Hydrionis
Period held	1902–2024
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1902 to 2024 is held.
Last read from the publisher	2026-08-24
Redistribution	Permitted by the upstream licences
Commercial reuse	Permitted by the upstream licences. No Hydrionis access tier can widen this.
Methodology	How this was produced

Every gauge Hydrionis holds within this area

Gauges within the Salinas and what each holds
Gauge	Measures	Values	Record
ARROYO SECO NR SOLEDAD CA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	279	1902–2026
SALINAS R NR SPRECKELS CA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	213	1930–2026

How these gauges were attached to this water

Assigned by the publisher to a numbered basin Every gauge here is assigned to this drainage area by its own publisher, which issues the area an official code — 18060005. A drainage area is not a river: it contains the tributaries as well as the main channel, and a gauge in it may be on any of them.

What each gauge’s link to this water rests on
Gauge	Evidence	Established
ARROYO SECO NR SOLEDAD CA	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-08-26
SALINAS R NR SPRECKELS CA	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-08-26

What this record holds

Hydrionis decides which waters get a page, and which of those are offered to search, from what is actually held rather than from how the page reads. Five signals are counted; this record has 3 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	2	no
Years spanned	125	yes, 20 or more
Values held	492	no
Distinct measurements	4	yes, 2 or more
Publishers measuring it	2	yes, 2 or more
Official identifiers	1	recorded, not counted

Use this data

Machine-readable JSON /api/v1/observations/by-subject/gauge-usgs-11152000.json
How to cite this, and who you must credit
How these figures were produced
Request this at a different scale, format or geography

No bulk download is offered here, which is a licence position rather than a product one: at least one contributing publisher does not permit redistribution. The values can be read on the page, cited, and pointed to at source.

Attribution and citation

Suggested citation for Hydrionis

Hydrionis (2026), Salinas gauge records, accessed 2026-09-02, hydrionis.com/waters/united-states-salinas/

Cite Hydrionis where you rely on values Hydrionis computed, on the method that produced them, or on the compilation itself. The underlying measurements remain the publishers’ and their attribution requirements apply to you directly.

Recommended, not required. Hydrionis does not claim rights over unmodified public data it relayed, and doing arithmetic on somebody else’s measurements does not make them Hydrionis’s. Cite the version and the access date: the Salinas gauge records changes as publishers release and as methods are revised, and a citation without both cannot be checked later. Full guidance is on cite and reuse.

None of the contributing licences requires attribution. Crediting the publishers is still good practice and they are listed above.

Where these figures come from

MeasuredHigh confidence2025-02-13

Source: USGS — National Water Information System, USGS site 11152000, annual peak streamflow. Licence: Open.

Method: The instantaneous maximum discharge of each water year as published by USGS, dated to the day it occurred. One value per October-to-September water year; where the publisher lists both a systematic and a historic peak for a year, the larger is the annual maximum. Values the publisher marks as maximum daily averages are not held here, because they are not instantaneous peaks. Values marked as bounded rather than measured are held as censored observations carrying the bound. Cubic feet per second are converted to cubic metres per second and the publisher unit is recorded alongside.

Rating curves are extrapolated at extreme discharges, so the largest values in a peak series carry the largest measurement uncertainty. Data from the U.S. Geological Survey National Water Information System, a work of the United States government and therefore in the public domain.

Retrieved 31 August 2026.