Arstaddalsdammen is a lake that lies in Beiarn Municipality in Nordland county, Norway. It is located about southwest of the village of Moldjord. The lake lies in the southern end of the Arstaddal valley, and it has a dam on the northern end. The dam was built in the 1960s. The water from the lake is piped to the nearby lake Sokumvatnet in GildeskÃÂ¥l Municipality. The lake serves as a reservoir for the Sundsfjord Hydroelectric Power Station.