In Japan, technical standard for asphalt facing-typed dam or reservoir is not established. So, a unique method of stability evaluation for a reservoir fully surfaced with asphalt mixture has been proposed for upper reservoir of Omarugawa pumped-storage power plant in Japan. The asphalt facing work is now under execution, and it is aimed to complete in February 2006. A construction work control standard for asphalt facing of this site has been established on the assumption of a-year-round construction in consideration of the results of laboratory tests and trial construction. Besides, some brand-new control methods have been established at this site including standardization of temperature of the last compaction work and execution of indirect leveling for the purpose of verifying the result of general layer thickness control method based on measurement of total weight of paved asphalt mixture. In this paper, the basic concept on the design of a reservoir fully surfaced with asphalt concrete is interpreted first. Secondary, a state-of-the-art construction work control standard for the asphalt facing established for this site is described.