# Grand Hers river

Also known as: Le Grand Hers

The Grand Hers (also known as Le Grand Hers) is a European river flowing through France. As of 2026-10-15, the Grand Hers was flowing at about 2.813 m³/s at the Le Grand Hers à Roumengoux gauge.

**Canonical name:** Grand Hers

**Local names / aliases:** Le Grand Hers

**Countries:** France

**Maximum upstream drainage area:** 1,390 km²

**Mapped river length:** 58.5 km

**Gauging stations:** 5

**Latest measured discharge:** 2.813 m³/s (Le Grand Hers à Roumengoux, 2026-10-15)

## Gauging stations on the Grand Hers

The following 5 gauging stations report discharge for the Grand Hers, ordered downstream (largest catchment first). Discharge is in cubic metres per second (m³/s).

| Station | Country | Discharge (m³/s) | Historical Comparison | Observed | Measurement | Data quality | Provider | Lat, Lon | Source |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Le Grand Hers à Roumengoux | France | 2.813 | Below normal — 20% below the historic median | 2026-10-15 | daily mean | Donnée brute | Hub'Eau Hydrométrie | 43.083, 1.934 | [source](https://www.hydro.eaufrance.fr/stationhydro/O153291001/series) |
| Le Grand Hers à Mirepoix | France | 1.183 | — | 2026-10-15 | daily mean | Donnée brute | Hub'Eau Hydrométrie | 43.093, 1.876 | [source](https://www.hydro.eaufrance.fr/stationhydro/O153292001/series) |
| La Vixiège à Belpech | France | 0.02 | Much below normal — 69% below the historic median | 2026-10-15 | daily mean | Donnée brute | Hub'Eau Hydrométrie | 43.202, 1.75 | [source](https://www.hydro.eaufrance.fr/stationhydro/O163401001/series) |
| Le Grand Hers à Mazères | France | 5.508 | Normal — 9% below the historic median | 2026-10-15 | daily mean | Donnée brute | Hub'Eau Hydrométrie | 43.254, 1.681 | [source](https://www.hydro.eaufrance.fr/stationhydro/O165293003/series) |
| Le Grand Hers à Calmont | France | 2.234 | Much below normal — 50% below the historic median | 2026-10-15 | daily mean | Donnée brute | Hub'Eau Hydrométrie | 43.292, 1.595 | [source](https://www.hydro.eaufrance.fr/stationhydro/O166291001/series) |

## Related rivers

-   [Loire](/rivers/loire.html)
-   [Seine](/rivers/seine.html)
-   [Garonne](/rivers/garonne.html)
-   [Saône](/rivers/saone.html)
-   [Dordogne](/rivers/dordogne.html)
-   [Maine](/rivers/maine.html)
-   [Vienne](/rivers/vienne.html)
-   [Tarn](/rivers/tarn.html)
-   [Allier](/rivers/allier.html)
-   [Durance](/rivers/durance.html)
-   [Oise](/rivers/oise.html)
-   [Cher](/rivers/cher.html)

## Data, sources & timestamps

Geometry is the HydroRIVERS network (HydroSHEDS): European reaches with at least 500 km² of upstream catchment, merged into chains between confluences. Flow direction comes from the network itself; river names are the canonical English label joined from provider metadata and Natural Earth, with local-language aliases retained.

Discharge is normalised observed streamflow from official national hydrology providers, measured where a gauge sits on the river and interpolated between gauges. Pale/estimated values are derived from drainage area × the local specific discharge of nearby gauges and are never presented as measurements.

Underlying dataset built 2026-10-16T13:31:53.036165+00:00. This page generated 2026-10-16T13:35:10.972Z. Discharge values carry their own observation dates in the table above.

[Explore the Grand Hers on the interactive map →](/)