Samarra Barrage (Arabic: سد سامَرّاء‎) and Tharthar Barrage (Arabic: سد الثَرثار‎) is a multi-purpose barrage on the Tigris River adjacent (west) of Samarra and north of Baghdad, Iraq. The main purpose of the dam is to divert floodwater in the Tigris River to Lake Tharthar through the Tharthar depression along with irrigation and an 84 MW hydro-electricity station.