Okutadami Dam
| Okutadami Dam | |
|---|---|
| Country | Japan |
| Location | Uonuma |
| Coordinates | 37°09′12″N 139°15′00″E / 37.15333°N 139.25000°E |
| Construction began | 1953 |
| Opening date | 1961 |
| Owner(s) | Electric Power Development Company |
| Dam and spillways | |
| Type of dam | Gravity |
| Impounds | Tadami River |
| Height | 157 m (515 ft) |
| Length | 475 m (1,558 ft) |
| Dam volume | 1,636,000 m3 (2,139,807 cu yd) |
| Reservoir | |
| Creates | Lake Okutadami |
| Total capacity | 601,000,000 m3 (487,239 acre⋅ft) |
| Active capacity | 458,000,000 m3 (371,307 acre⋅ft) |
| Catchment area | 595 km2 (230 sq mi) |
| Surface area | 1,150 ha (2,842 acres) |
| Normal elevation | 750 m (2,461 ft) |
| Power Station | |
| Commission date | 1960, 2003 |
| Hydraulic head | 120 MW units: 170 m (558 ft) 200 MW unit: 164.2 m (539 ft) |
| Turbines | 3 x 120 MW, 1 x 200 MW Francis-type |
| Installed capacity | 560 MW |
The Okutadami Dam (奥只見ダム) is a concrete gravity dam on the Tadami River, 26 km (16 mi) east of Uonuma on the border of Niigata and Fukushima Prefectures, Japan. The primary purpose of the dam is hydroelectric power generation and it supports a 560 MW power station which is the largest conventional hydroelectric power station in Japan. The dam also forms the second largest reservoir in Japan, next to that of the Tokuyama Dam.