Yokoyama Dam

Overview

Yokoyama Dam is a dam built on the Ibi River, part of the Kiso River system, in Ibigawa, Gifu Prefecture. Managed directly by Japan's national government, it is a hollow gravity concrete dam standing about 80 meters high. As a multipurpose dam, it serves flood control of the Ibi River along with water supply to the Seino area and hydroelectric power generation.

Highlights

• ●A hollow gravity concrete dam, a structural type featuring internal voids
• ●The scenery of water discharge from a dam body about 80 meters high
• ●Views over the reservoir named Oku-Ibi Lake framed by surrounding mountains
• ●The natural setting designated as part of Ibi-Sekigahara-Yoro Quasi-National Park

History

The dam was planned as a specified multipurpose dam under the Kiso Specified Region Comprehensive Development Plan, aimed at flood control and water resource development of the Ibi River. Construction proceeded in 1957, and it was developed to provide flood control, water supply and hydroelectric power. It once also served irrigation as a source for the Seino irrigation system, but that function was later transferred to Tokuyama Dam. A redevelopment project to increase storage capacity has also been carried out.

Map

35.5931, 136.4553 · Wikidata

Suggested itinerary

1. 1Observe the hollow gravity structure and any water discharge from a viewpoint facing the dam body
2. 2Take in the scenery of the reservoir, Oku-Ibi Lake, and the surrounding mountains
3. 3Experience the natural environment designated as part of Ibi-Sekigahara-Yoro Quasi-National Park
4. 4Follow the upper reaches of the Ibi River while enjoying the nearby natural landscape

Did you know?

💡 The dam's reservoir is named Oku-Ibi Lake.

Nearby spots