Historic sites located in the village of Mempura River are the tomb of a relative Siak kingdom named Tengku Buang Asmara, not far from the Mempura river’s cliff across village of Mempura River. Conditions unspoiled river bank and eroded continuously. Therefore, they need a cliff’s security wall to maintain the existence of historic sites. But the problem is, whether cliff’s safety wall counterfort are technically suitable for use in the Mempura River’s cliff walls. The purpose of this
research was to analyze the stability of a retaining wall on the riverbank cliff types counterfort Mempura River in the vicinity of the historic sites that still exist today. This research was conducted over nine months, starting in September 2014 until May 2015. The research location is in the village of Mempura River, district
Mempura, Siak regency, Riau Province. Location research narrowed to the area around the historic sites on the edge of the Mempura River. The calculation result shows that the security wall climbing dimension counterfort height of 3 m; slab width of 1,5 m; thick concrete plate 0,2 m; the width of the side walls 2,97 m; obtained value of the safety factor against rolling by 7,39; the value of the safety factor against sliding 3,76; eccentricity value of -0,17; the value of the soil bearing capacity for q1 = 5003,61 kg/m2 and q2 = 953,07 kg/m2. All criteria and values are met by a wall of cliffs safety counterfort thus concluded that this type of appropriate and recommended for safety Mempura river cliff.