The monitoring network within this area

Hydrionis holds 483 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

483

Values held

1916–2026

Record spans

Gauges within the San Jacinto 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 SAN JACINTO R NR ELSINORE CA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1916–2025.

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	SAN JACINTO R NR ELSINORE CA (m³/s)
1916	396
1917	3.68
1918	21.2
1919	0.184
1920	6.63
1921	54.7
1923	1.81
1924	1.59
1925	2.18
1926	62.3
1927	453
1928	0.057
1929	0.011
1930	0.241
1931	0.184
1932	18.5
1933	0.566
1934	0.566
1935	0.133
1936	0.102
1937	64.0
1938	79.0
1939	14.2
1940	1.08
1941	41.9
1943	33.1
1944	3.40
1945	0.178
1946	0.065
1948	0.020
1949	0.020
1952	18.6
1953	0.014
1954	0.821
1955	0.065
1957	0.368
1958	23.8
1959	0.023
1962	0.0057
1964	8.72
1965	8.64
1966	9.12
1967	0.311
1969	177
1970	0.425
1972	0.538
1973	1.16
1974	0.963
1976	0.510
1977	0.176
1978	178
1979	75.9
1980	255
1981	2.35
1982	18.1
1983	260
1984	1.64
1986	0.453
1987	0.105
1988	1.67
1989	0.105
1990	0.181
1991	75.6
1992	25.9
1993	195
1994	8.47
1995	72.5
1996	0.906
1997	27.6
1998	169
1999	0.091
2000	0.538
2001	2.89
2003	59.7
2004	1.81
2005	166
2006	0.793
2007	0.190
2008	25.5
2010	167
2012	0.340
2014	5.83
2015	7.96
2017	98.0
2018	3.31
2019	230
2020	59.7
2021	9.40
2023	24.4
2024	77.0
2025	15.1

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	1916–2025
Completeness	82.7% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	17 separate periods inside 1916–2025 hold no value. The longest runs from 1950 to 1951 — 2 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1916 and is not continuous from it: 110 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 SAN JACINTO R NR ELSINORE 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. 1916–2025.

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	SAN JACINTO R NR ELSINORE CA (mm)
1916	86.0
1917	4.00
1918	5.00
1919	0
1920	5.00
1921	11.0
1922	33.0
1923	0
1924	0
1925	0
1926	8.00
1927	55.0
1928	0
1929	0
1930	0
1931	0
1932	7.00
1933	0
1934	0
1935	0
1936	0
1937	58.0
1938	38.0
1939	3.00
1940	0
1941	31.0
1942	0
1943	5.00
1944	1.00
1945	0
1946	0
1947	0
1948	0
1949	0
1950	0
1951	0
1952	11.0
1953	0
1954	0
1955	0
1956	0
1957	0
1958	6.00
1959	0
1960	0
1961	0
1962	0
1963	0
1964	18.0
1965	2.00
1966	9.00
1967	0
1968	0
1969	38.0
1970	0
1971	0
1972	0
1973	1.00
1974	0
1975	0
1976	0
1977	0
1978	35.0
1979	15.0
1980	111
1981	1.00
1982	1.00
1983	47.0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	7.00
1992	5.00
1993	70.0
1994	1.00
1995	24.0
1996	0
1997	2.00
1998	11.0
1999	0
2000	0
2001	1.00
2002	0
2003	6.00
2004	6.00
2005	27.0
2006	1.00
2007	0
2008	2.00
2009	1.00
2010	17.0
2011	3.00
2012	0
2013	0
2014	0
2015	0
2016	2.00
2017	8.00
2018	0
2019	15.0
2020	7.00
2021	3.00
2022	0
2023	10.0
2024	11.0
2025	4.00

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	1916–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1916 to 2025 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 San Jacinto and what each holds
Gauge	Measures	Values	Record
SAN JACINTO R NR ELSINORE CA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	252	1916–2026
SAN JACINTO R NR SAN JACINTO	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	231	1921–2026

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 — 18070202. 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
SAN JACINTO R NR ELSINORE 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
SAN JACINTO R NR SAN JACINTO	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	111	yes, 20 or more
Values held	483	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-11070500.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), San Jacinto gauge records, accessed 2026-09-02, hydrionis.com/waters/united-states-san-jacinto/

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 San Jacinto 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 confidence2025-03-14

Source: USGS — National Water Information System, USGS site 11070500, 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.