| Fukashiro Dam | |
| Location Map: | Japan |
| Coordinates: | 35.7078°N 138.9483°W |
| Country: | Japan |
| Location: | Ōtsuki |
| Status: | O |
| Construction Began: | 1996 |
| Opening: | 2004 |
| Dam Type: | Concrete gravity |
| Dam Height: | 870NaN0 |
| Dam Length: | 1640NaN0 |
| Dam Volume: | 2000000NaN0 |
| Spillway Capacity: | 7900NaN0 |
| Res Capacity Total: | 64400000NaN0 |
| Res Capacity Active: | 51400000NaN0 |
| Res Catchment: | 43.30NaN0[1] |
The Fukashiro Dam is a gravity dam in the Sagami River system, located 110NaN0 north of Ōtsuki in Yamanashi Prefecture, Japan. The purpose of the dam is flood control and water supply. Plans for the dam were drawn up in 1978 and construction on the diversion tunnels began in 1996. The dam reached its height in 2001 and in 2003, the reservoir began to fill.[2] By 2004, the entire dam was complete. It is 870NaN0 tall and 1640NaN0 long at the crest.[3] The dam's main spillway consists of five free overflow openings with a 7900NaN0 discharge capacity. To handle additional discharges, there are two additional openings on the dam's orifice and two jet flow openings as part of the outlet works.[1]