The present study were done to assess the influence of geometric design of forest roads on the rate of pavement rutting. For this purpose, geometric specification of 2 kilometers of road in Pashakola forest in mountainous area were measured using the NIVO-C mapping camera. Then, forest road network were designed using ROADENG software. Results showed significant difference for rut depth between the longitudinal slope in classes of above and below 5% (P>0.05, R2= 0.42). A significant difference was found for pavement rutting for horizontal radius curves between the classes of < 22 m and > 30 m. The rut area and depth decreased with increasing width on curve. The rut depth decreased with increasing super elevation up to 4 percent and then increased. To reduce damages, the plan details, operational tasks and the type of vehicles which will pass in later years must be considered when the roads are planned. Suitable materials must be used for pavement layer of road to increase stability of this layer. Also, the road surface must be graded before and after of timber harvesting. When the weather is unsuitable (rainy) and the road surface is wet it is better that the timber skidding was stopped.b
