The use of nail poles construction as the crib structure that crosses river for protecting cliffts and scouring has indirectly been applied. However, the phenomenon in the field there are many function failures of the nail poles crib construction. This research intends to investigate the the most effective crib formation that is used in the three variation of river turn. beginning from the sharp. moderate. and non-sharp turn. The modelling uses the iRIC software. This research conducted in Ciasem River. Wesi Java Province. Indonesia. The result shows that the perpendicular formation of crib is the most effective in decreasing the souring and sedimentation that is happened.