Gabions structures are used to decrease the effect of potential energy existed at the low-heading up structures to protect these structures from collapse because of scour. Buttress gabion spillways are a potential option as a modification of classical gabions for being more suitable for medium and high heading up structures. This study aims to investigate the effect of using Buttress gabion spillways with two stiffeners in the longitudinal-direction of the gabion on the hydraulic performance and their impact on scour downstream of the basin. For this purpose, three experimental buttress gabion models with different stiffeners’ widths (i.e. 18mm, 22.5 mm, 32.5 mm) were tested. The height of these models is 20 cm with 5 steps; each step has a 7cm horizontal projection and 4 cm vertical projection. The models were made of stainless steel covered with narrow steel mesh. While the stiffeners were made of coated wooden against water. A classical gabion model with particle size diameter (5 mm) and a solid model were tested to compare the results with the buttress gabion spillways. From results, it’s elucidated that the energy dissipation decreases as the relative buttress width ratio increases. On the other hand, the relative sequent depth of the jump and the maximum scour depth increase as this ratio increases. Therefore, the results of this study may be recommended in the field of applications.