# Semoy river

Also known as: La Semoy

The Semoy (also known as La Semoy) is a European river flowing through France. As of 2026-10-15, the Semoy was flowing at about 0.436 m³/s at the La Semoy en Belgique \[Chiny\] gauge.

**Canonical name:** Semoy

**Local names / aliases:** La Semoy

**Countries:** France

**Maximum upstream drainage area:** 1,335 km²

**Mapped river length:** 111 km

**Gauging stations:** 7

**Latest measured discharge:** 0.436 m³/s (La Semoy en Belgique \[Chiny\], 2026-10-15)

## Gauging stations on the Semoy

The following 7 gauging stations report discharge for the Semoy, 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 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| La Semoy en Belgique \[Chiny\] | France | 0.436 | — | 2026-10-15 | daily mean | Donnée brute | Hub'Eau Hydrométrie | 49.745, 5.351 | [source](https://www.hydro.eaufrance.fr/stationhydro/B610000401/series) |
| Herbeumont | Belgium | 0.7 | Much below normal — 84% below the historic median | 2026-10-16 | instantaneous | operational 10-minute value | Service public de Wallonie Hydrométrie | 49.769, 5.236 | [source](https://hydrometrie.wallonie.be/home/services/telechargements-des-donnees.html) |
| Auby-sur-Semois | Belgium | 0.05 | Much below normal — 88% below the historic median | 2026-10-16 | instantaneous | operational 10-minute value | Service public de Wallonie Hydrométrie | 49.811, 5.167 | [source](https://hydrometrie.wallonie.be/home/services/telechargements-des-donnees.html) |
| La Semoy en Belgique \[Bouillon\] | France | 0.995 | — | 2026-10-15 | daily mean | Donnée brute | Hub'Eau Hydrométrie | 49.792, 5.063 | [source](https://www.hydro.eaufrance.fr/stationhydro/B610000601/series) |
| Vresse-sur-Semois | Belgium | 0.046 | Much below normal — 84% below the historic median | 2026-10-16 | instantaneous | operational 10-minute value | Service public de Wallonie Hydrométrie | 49.873, 4.938 | [source](https://hydrometrie.wallonie.be/home/services/telechargements-des-donnees.html) |
| La Semoy en Belgique \[Membre\] | France | 1.214 | — | 2026-10-15 | daily mean | Donnée brute | Hub'Eau Hydrométrie | 49.864, 4.902 | [source](https://www.hydro.eaufrance.fr/stationhydro/B610000201/series) |
| La Semoy à Haulmé | France | 1.653 | Much below normal — 86% below the historic median | 2026-10-15 | daily mean | Donnée brute | Hub'Eau Hydrométrie | 49.863, 4.786 | [source](https://www.hydro.eaufrance.fr/stationhydro/B611101001/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 Semoy on the interactive map →](/)