The history of erosion control dams started with a series of dams constructed with stones by dry masonry method, as part of the erosion control dam program under the direct control of the Ministry of Home Affairs during the Meiji Era. Many of those old dams have been destroyed as a result of frequent sediment discharges. However, some of the existing old dams have blended in with local landscaper and have been registered at tangible cultural properties due to their historical significance. Most

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... of those valuable old dams, however, are decayed from repeated outflow of earth and sand, and repairs and/or reinforcement measures must be taken for them immediately. This paper focuses on the Kamatsusawa Erosion Control Dam, which is one of the historic erosion control dams registered as tangible cultural properties, forming a group along the Inari River, Nikko City, Tochigi Prefecture, as an example of efforts to effectively preserve historic erosion control facilities. Appropriate stability collation constants are set on the basis of in-situ tests and laboratory experiments, and it is indicated that aging facilities can be maintained effectively by taking minimum reinforcement and/or repair measures involving stability collations with a multilayered structure weight calculation method for the dam body and multilayered ground banking-sand calculation method applied.