The Arrats de devant, sometimes called the Petit Arrats (little Arrats), is a river in southern France and a sub-tributary of the Garonne via the Arrats.

Measuring 14.1 km (8.8 mi) long, the Arrats de devant originates in the Hautes-Pyrénées department in the commune of Betbeze, starting an elevation of 387.05 m (1,269.8 ft). It flows into the Arrats at the commune of Bézues-Bajon in the Lac de l'Astarac, ending at an elevation of 237.51 m (779.2 ft).

Lac de l'Astarac is formed from two forks, creating a Y-shape. The east fork is the Petit Arrats, while the west fork is formed by the upstream part of the Arrats.

• Hautes-Pyrénées:
  • Betbeze,
  • Thermes-Magnoac,
  • Casterets.
• Gers:
  • Mont-d'Astarac,
  • Lalanne-Arqué,
  • Manent-Montané,
  • Saint-Blancard,
  • Cabas-Loumassès,
  • Aussos,
  • Bézues-Bajon

• (L) Métairie du Bois creek : 1.4 km (0.87 mi)
• (L) Briquet creek : 1.4 km (0.87 mi)
• (R) Gouttillets creek : 1.3 km (0.81 mi)
• (R) Nax creek : 1.5 km (0.93 mi)

(R) right bank; (L) left bank.

• 
  Natural log jam on the river destroyed by the February 2021 flood.
• 
  Bridge over the D139.

• French Wikipedia; Arrats de devant, Accessed on December 4, 2024.