The monitoring network within this area

Hydrionis holds 903 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.

2

Gauges

903

Values held

1910–2026

Record spans

Gauges within the Salmon Falls 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 SALMON FALLS CREEK NR SAN JACINTO NV

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1911–2025.

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	SALMON FALLS CREEK NR SAN JACINTO NV (m³/s)
1911	30.0
1912	36.8
1913	18.8
1914	23.7
1915	6.97
1916	17.7
1919	23.4
1920	16.5
1921	33.1
1922	33.1
1923	14.8
1924	18.3
1925	20.7
1926	9.91
1927	23.2
1928	16.8
1929	14.8
1930	10.6
1931	5.78
1932	21.9
1933	13.5
1934	2.78
1935	16.5
1936	22.5
1937	10.3
1938	22.7
1939	49.8
1940	9.57
1941	8.95
1942	38.8
1943	57.8
1944	25.2
1945	26.9
1946	25.4
1947	9.68
1948	15.5
1949	28.3
1950	22.6
1951	34.5
1952	40.5
1953	13.6
1954	5.66
1955	10.5
1956	24.3
1957	34.8
1958	24.7
1959	8.64
1960	17.8
1961	6.68
1962	55.8
1963	20.4
1964	24.0
1965	23.4
1966	9.49
1967	18.2
1968	9.17
1969	26.1
1970	31.7
1971	38.8
1972	32.0
1973	24.0
1974	40.5
1975	68.8
1976	28.3
1977	7.62
1978	18.8
1979	24.6
1980	40.5
1981	7.82
1982	29.2
1983	35.7
1984	109
1986	40.8
1988	12.5
1989	23.8
1990	8.21
1991	9.74
1992	3.37
1993	30.3
1994	10.00
1995	46.7
1996	24.4
1997	26.8
2005	40.5
2007	13.8
2008	18.4
2009	28.2
2010	19.2
2011	43.9
2012	18.5
2013	9.43
2014	10.9
2015	14.8
2016	23.2
2017	114
2018	9.51
2019	44.5
2020	18.1
2021	5.32
2022	10.7
2023	32.0
2024	22.8
2025	13.3

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	1911–2025
Completeness	89.6% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	5 separate periods inside 1911–2025 hold no value. The longest runs from 1998 to 2004 — 7 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1911 and is not continuous from it: 115 years separate the first value from the last, and 90% of the years between them are held. The span is not the record.
Last read from the publisher	2026-10-01
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 SALMON FALLS CREEK NR SAN JACINTO NV, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1911–2025.

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	SALMON FALLS CREEK NR SAN JACINTO NV (mm)
1911	34.0
1912	54.0
1913	36.0
1914	45.0
1915	17.0
1920	29.0
1922	41.0
1923	34.0
1924	26.0
1925	36.0
1926	18.0
1927	33.0
1928	29.0
1929	29.0
1930	18.0
1931	13.0
1932	37.0
1933	24.0
1934	11.0
1935	26.0
1936	31.0
1937	20.0
1938	36.0
1939	28.0
1940	19.0
1941	21.0
1942	52.0
1943	58.0
1944	40.0
1945	45.0
1946	35.0
1947	21.0
1948	31.0
1949	39.0
1950	40.0
1951	47.0
1952	52.0
1953	27.0
1954	15.0
1955	19.0
1956	38.0
1957	43.0
1958	36.0
1959	18.0
1960	27.0
1961	14.0
1962	51.0
1963	31.0
1964	42.0
1965	47.0
1966	17.0
1967	30.0
1968	19.0
1969	41.0
1970	44.0
1971	67.0
1972	56.0
1973	42.0
1974	42.0
1975	61.0
1976	42.0
1977	18.0
1978	39.0
1979	41.0
1980	50.0
1981	15.0
1982	47.0
1983	55.0
1984	109
1985	41.0
1986	51.0
1987	17.0
1988	25.0
1989	37.0
1990	20.0
1991	22.0
1992	12.0
1993	45.0
1994	17.0
1995	49.0
1996	45.0
1997	54.0
1998	45.0
1999	38.0
2000	22.0
2001	15.0
2002	26.0
2003	18.0
2004	26.0
2005	39.0
2006	56.0
2007	22.0
2008	25.0
2009	42.0
2010	31.0
2011	65.0
2012	19.0
2013	19.0
2014	20.0
2015	23.0
2016	45.0
2017	73.0
2018	19.0
2019	55.0
2020	30.0
2021	14.0
2022	22.0
2023	47.0
2024	35.0
2025	22.0

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	Derived Computed by Hydrionis
Period held	1911–2025
Completeness	95.7% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	2 separate periods inside 1911–2025 hold no value. The longest runs from 1916 to 1919 — 4 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1911 and is not continuous from it: 115 years separate the first value from the last, and 96% of the years between them are held. The span is not the record.
Inputs last read	2026-10-01 · when the records this was computed from were last read from their publishers
Calculation date	2026-08-24 · when the calculation method was last versioned, not a reading of any publisher
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

The snow standing above this water

2 automated snow stations sit inside this drainage area, weighing the snowpack rather than measuring how deep it is.

563

Fullest snowpack recorded at Wilson Creek, in 2023 (mm of water)

72

Thinnest, in 2026 (mm of water)

March

Month the pack is usually at its fullest

May

Month the pack has gone by, in half of years

Peak snowpack at Wilson Creek

Water years 1991–2026. Each point is the fullest month of that snow season.

A water year runs October to September and is named for the year it ends, so the snow of one winter stays in one point. The value is the fullest month, not the fullest day: a pack that peaked sharply mid-month reads lower here than a single measurement taken at the right moment would.

View the data behind this chart

Underlying data
Period	Wilson Creek (mm)
1991	254
1992	188
1993	349
1994	223
1995	268
1996	362
1997	420
1998	336
1999	340
2000	377
2001	261
2002	371
2003	190
2004	392
2005	205
2006	501
2007	228
2008	406
2009	410
2010	353
2011	456
2012	186
2013	328
2014	244
2015	240
2016	380
2017	303
2018	177
2019	379
2020	334
2021	308
2022	239
2023	563
2024	387
2025	324
2026	72.0

Read against the river

Wilson Creek and SALMON FALLS CREEK NR SAN JACINTO NV both sit in this drainage area, and their records overlap by 34 years. That is the span the two have in common, not a count of years both actually hold — either record may have gaps inside it. The two are shown separately rather than on one axis: millimetres of stored water and cubic metres per second are not commensurable, and a difference between them would mean nothing.

Being in the same drainage area does not put the snowpack upstream of the gauge. A subbasin is an area, and snow on one tributary can join the river below a gauge on another — so a weak relationship here may say more about which tributary was measured than about the snow.

Every gauge Hydrionis holds within this area

Gauges within the Salmon Falls and what each holds
Gauge	Measures	Values	Record
SALMON FALLS CREEK NR SAN JACINTO NV	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	360	1910–2026
CEDAR CREEK NR ROSEWORTH ID	catchment area, annual maximum river flow	12	1910–2026

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 — 17040213. 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
SALMON FALLS CREEK NR SAN JACINTO NV	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	2026-10-02
CEDAR CREEK NR ROSEWORTH ID	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	2026-10-02

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	1	no
Years spanned	117	yes, 20 or more
Values held	903	no
Distinct measurements	6	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-13105000.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), Salmon Falls gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-salmon-falls/

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 Salmon Falls 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 confidence2025-02-25

Source: USGS — National Water Information System, USGS site 13105000, 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 1 October 2026.