Le Rhône — monitoring and records

The monitoring network on this water

Hydrionis holds 8,897 values from 8 gauges on this water. Discharge is a property of a gauge and its reach, not of this water as a whole, so this page reports the network and its records rather than a single figure.

Gauges

8,897

Values held

1900–2026

Record spans

95,590 km²

Catchment above the deepest gauge

The seasonal shape

An annual mean says how much water a river carried. A monthly record says when — and on most rivers the difference between a wet winter and a dry summer is larger than the difference between one year and the next.

Monthly mean flow at Le Rhône à Tarascon

Each month's mean discharge as the publisher computed it, which shows the seasonal shape an annual mean flattens away. 1900–2026.

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

Taken as the publisher computes it rather than recomputed by Hydrionis from daily values: the publisher knows which of its readings passed validation. Months the gauge did not cover are absent rather than interpolated, and the line breaks where they fall.

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
European drought	Drought declaration	2022-05-01 – 2022-10-31	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.
Hurricane Katrina water and sanitation collapse — 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	Le Rhône à Tarascon (m³/s)
1900	2,466
1901	1,408
1902	2,477
1903	1,706
1904	1,214
1905	1,233
1906	2,200
1907	1,265
1908	1,744
1909	1,399
1910	2,950
1911	1,564
1912	2,860
1913	1,766
1914	1,347
1915	2,848
1916	1,815
1917	2,574
1918	2,498
1919	3,690
1920	3,453
1921	1,219
1922	1,593
1923	2,068
1924	3,178
1925	1,053
1926	2,617
1927	1,548
1928	1,909
1929	1,482
1930	2,692
1931	2,410
1932	2,467
1933	1,266
1934	1,632
1935	1,574
1936	5,414
1937	1,598
1938	1,472
1939	2,798
1940	1,721
1941	2,869
1942	1,018
1943	2,220
1944	1,268
1945	1,176
1946	1,386
1947	1,479
1948	3,578
1949	1,606
1950	1,242
1951	2,410
1952	2,048
1953	1,548
1954	1,095
1955	5,185
1956	2,107
1957	1,214
1958	1,604
1959	2,711
1960	2,654
1961	2,233
1962	2,693
1963	1,795
1964	1,160
1965	1,248
1966	2,961
1967	2,072
1968	2,453
1969	2,343
1970	2,215
1971	1,442
1972	1,119
1973	1,216
1974	1,404
1975	2,045
1976	1,191
1977	2,505
1978	2,171
1979	2,029
1980	2,010
1981	2,231
1982	3,475
1983	2,029
1984	2,009
1985	1,691
1986	1,841
1987	1,783
1988	2,514
1989	858
1990	683
1991	2,223
1992	1,094
1993	1,108
1994	4,667
1995	3,151
1996	3,449
1997	3,057
1998	2,502
1999	1,958
2000	1,715
2001	2,997
2002	1,335
2003	2,753
2004	1,280
2005	1,479
2006	1,172
2007	1,049
2008	2,147
2009	1,785
2010	2,072
2011	2,081
2012	2,676
2013	2,293
2014	3,363
2015	2,202
2016	1,841
2017	932
2018	3,727
2019	1,155
2020	1,674
2021	2,336
2022	1,847
2023	1,819
2024	2,493
2026	544

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	Office français de la biodiversité / SCHAPI — Hydrométrie — French river flow and stage · Licence Ouverte / Open Licence v2.0 (Etalab)
How the values came to exist	Measured
Period held	1900–2026
Completeness	99.2% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1900–2026 holds no value: 2025. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1900 and is not continuous from it: 127 years separate the first value from the last, and 99% 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

Every gauge Hydrionis holds here

Gauges on the Le Rhône and what each holds
Gauge	Measures	Values	Record
Le Rhône à Tarascon	mean monthly river flow	1,458	1900–2026
Le Rhône à Surjoux	mean monthly river flow	1,260	1920–2024
Le Rhône à Valence	mean monthly river flow	1,260	1920–2024
Le Rhône à Viviers	mean monthly river flow	1,260	1920–2024
Le Rhône à Pougny	mean monthly river flow	1,199	1925–2024
Le Rhône à Lagnieu	mean monthly river flow	876	1920–1992
Le Rhône à Lyon	mean monthly river flow	876	1920–1992
Le Rhône à Ternay	mean monthly river flow	708	1966–2024

How these gauges were attached to this water

Named by the publisher Each gauge here names this water in the publisher’s own station record. Hydrionis has not inferred the connection from station names.

What each gauge’s link to this water rests on
Gauge	Evidence	Established
Le Rhône à Tarascon	Stated by the publisher — Hub'Eau hydrometry site reference, libelle_cours_eau, code_cours_eau and surface_bv fields — https://hubeau.eaufrance.fr/api/v2/hydrometrie/referentiel/sites	2026-10-02
Le Rhône à Surjoux	Stated by the publisher — Hub'Eau hydrometry site reference, libelle_cours_eau, code_cours_eau and surface_bv fields — https://hubeau.eaufrance.fr/api/v2/hydrometrie/referentiel/sites	2026-10-02
Le Rhône à Valence	Stated by the publisher — Hub'Eau hydrometry site reference, libelle_cours_eau, code_cours_eau and surface_bv fields — https://hubeau.eaufrance.fr/api/v2/hydrometrie/referentiel/sites	2026-10-02
Le Rhône à Viviers	Stated by the publisher — Hub'Eau hydrometry site reference, libelle_cours_eau, code_cours_eau and surface_bv fields — https://hubeau.eaufrance.fr/api/v2/hydrometrie/referentiel/sites	2026-10-02
Le Rhône à Pougny	Stated by the publisher — Hub'Eau hydrometry site reference, libelle_cours_eau, code_cours_eau and surface_bv fields — https://hubeau.eaufrance.fr/api/v2/hydrometrie/referentiel/sites	2026-10-02
Le Rhône à Lagnieu	Stated by the publisher — Hub'Eau hydrometry site reference, libelle_cours_eau, code_cours_eau and surface_bv fields — https://hubeau.eaufrance.fr/api/v2/hydrometrie/referentiel/sites	2026-10-02
Le Rhône à Lyon	Stated by the publisher — Hub'Eau hydrometry site reference, libelle_cours_eau, code_cours_eau and surface_bv fields — https://hubeau.eaufrance.fr/api/v2/hydrometrie/referentiel/sites	2026-10-02
Le Rhône à Ternay	Stated by the publisher — Hub'Eau hydrometry site reference, libelle_cours_eau, code_cours_eau and surface_bv fields — https://hubeau.eaufrance.fr/api/v2/hydrometrie/referentiel/sites	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	8	yes, 3 or more
Years spanned	127	yes, 20 or more
Values held	8,897	yes, 1000 or more
Distinct measurements	1	no
Publishers measuring it	1	no
Official identifiers	2	recorded, not counted

Use this data

Machine-readable JSON /api/v1/observations/by-subject/gauge-fr-v7200010.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

Attribution you are required to give

These are conditions of the licences the underlying data is published under. They are obligations to the publishers, not to Hydrionis, and they apply to you directly whether or not you mention Hydrionis at all.

Source: Hub’Eau / Système d’information sur l’eau, under Licence Ouverte (Etalab).

Office français de la biodiversité / SCHAPI — Licence Ouverte / Open Licence v2.0 (Etalab) (licence text)

Suggested citation for Hydrionis

Hydrionis (2026), Le Rhône gauge records, accessed 2026-10-05, hydrionis.com/waters/france-le-rhone/

Cite Hydrionis where you rely on the compilation, the normalisation, the eligibility judgements or a chart. Where you use an unmodified published value, the publisher’s attribution is the one that is required; crediting Hydrionis as well is welcome and is not something Hydrionis can require of you.

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 Le Rhône 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.

Where these figures come from

MeasuredHigh confidenceSeptember 2026

Source: Hub'Eau — Hydrométrie — French river flow and stage, V7200010. Licence: Open — attribution required (attribution required).

Method: Monthly mean discharge (QmM) computed by the publisher from its validated sub-hourly record, reported in litres per second and converted to cubic metres per second as they are collected. Where a site has been measured by more than one station, the station with the longest published series is used rather than blending stations whose values for the same month can differ.

Measured on Le Rhône.

Retrieved 1 October 2026.