Lac de Monteynard-Avignonet (Treffort)

Lac de Monteynard-Avignonet (Treffort) is a standout inland kite and wind sport venue in the French Alps, best known for its dependable thermal wind that develops in the afternoon under sunny conditions. The lake orientation and local valley effects create a “jet” acceleration that can noticeably increase wind in the lake axis, making the session feel strong and consistent for many days in spring and summer. For kitesurfers, the spot’s defining feature is the combination of a dedicated launch/landing kite area and the lake’s reservoir-like riding conditions. Local descriptions emphasize strong, consistent south/wind-axis thermals and the possibility of very high gusts (often beyond 40 knots), so the environment is typically suited to confident riders. Windsurfing and wingfoiling can also be excellent, supported by deep water and a stable wind window, but congestion and zone rules mean you should plan access and launches carefully. Safety is closely tied to wind strength, space constraints, and traffic. The beach/launch area at Treffort is described as very small and narrow, with steep terrain around the lake and navigation/zone restrictions near sensitive areas such as the dam. Ships and especially the Mira ferry are described as having right of way and creating wake/waves—watching traffic and respecting navigation rules are essential before and during your session. Water remains cold outside peak season, with winter described as extremely cold and local guidance stressing thermal protection (hood and boots highlighted in winter advice). Even during the warm season, conditions can change quickly toward sunset, so using forecast checks, riding with others, and staying inside the designated kite zone are practical local expectations for a safer day on the water.