Arros (river)

The Arros is a river in southwestern France that flows through the Hautes-Pyrénées and Gers departments, in the Occitanie region. The Arros is a right tributary of the Adour river.

Arros
The Arros in Saint-Sever-de-Rustan
Location
CountryFrance
Physical characteristics
Source 
 - locationBaronnies of Pyrenees
Mouth 
 - locationAdour
 - coordinates43°39′44″N 0°1′41″W
Length130 km (81 mi)
Basin size947 km2 (366 sq mi)
Discharge 
 - average9 m3/s (320 cu ft/s)
Basin features
ProgressionAdour→ Atlantic Ocean

The valleys of the Arros and of the Adour rivers were part of the Comté de Bigorre ("County of Bigorre"). The valley of the Arros was called the Rivière-Haute ("Upper River") and the valley of the Adour was called the Rivière-Basse ("Lower River").

Geography

The Arros river has a length of 130.2 km (80.9 mi),[1] and a drainage basin with an area of approximately 1,283 km2 (495 sq mi).

Its average yearly discharge (volume of water which passes through a section of the river per unit of time) is 6.92 m3/s (244 cu ft/s) at Juillac in the Gers department.[2]

Average monthly discharge (m3/s) at Juillac (51 years)[2]

Course

The Arros river starts, an altitude of 586 m (1,922.6 ft), in the Forêt des Baronnies, southeast of Bagnères-de-Bigorre, in the Esparros commune.[3] It then flows from south to north through the Hautes-Pyrénées department. It passes through the towns of Bourg-de-Bigorre, Tournay and Chelle-Debat. It gets in the Gers department and passes through the towns of Montégut-Arros and Villecomtal-sur-Arros.

About 4 km (2.5 mi) from Plaisance, the Arros joins, by its right side, the Adour river at an altitude of 113 m (370.7 ft).[4]

The Arros flows through 55 communes and two of them, both in the Gers department, have the name of the river: Montégut-Arros and Villecomtal-sur-Arros.

Main tributaries

Most of the tributaries of the Arros are small streams; the only important tributaries are:

  • Near the source of the Arros.
  • The upper Arros in a very humid valley.
  • The Arros in Villecomtal-sur-Arros.
  • The Arros in Plaisance.

References
Wikimedia Commons has media related to Arros.
  1. "L'Arros (Q0--0250)" (in French). SANDRE - Portail national d'accès aux référentiels sur l'eau. Retrieved 9 June 2017.
  2. "L'Arros à Juillac" (in French). Banque Hydro. Archived from the original on 1 October 2018. Retrieved 9 June 2017.
  3. "Source de l'Arros" (in French). Géoportail. Retrieved 9 June 2017.
  4. "Confluence de l'Arros" (in French). Géoportail. Retrieved 9 June 2017.
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