The dam's embankment is constructed as a central core rock-fill dam, a design chosen for its stability in seismic-prone regions.
It is integrated into the Brantas River basin management system, the primary water source for East Java.
The reservoir capacity is designed to store approximately 122 million cubic meters of water.
The surrounding elevation contributes to a microclimate significantly cooler than the urban center of Tulungagung.
It supplies water for the irrigation of over 3,000 hectares of agricultural land.
Bendungan Wonorejo is one of the largest rock-fill dams in Southeast Asia, serving primarily as a vital irrigation source and hydroelectric power plant for the Tulungagung region. Situated at the foot of Mount Wilis, the site functions as a multi-purpose water reservoir managed by Jasa Tirta I. The dam features an expansive landscape characterized by pine forests and significant water surface area. It plays a critical role in flood control for the surrounding lowland areas. Recreational facilities, including speedboats and fishing areas, are available to visitors. The area is accessible via winding mountainous roads that offer panoramic views of the reservoir basin.
The elevated viewing platform near the main embankment which offers a 180-degree view of the reservoir and the forest horizon.
Bring a light jacket as temperatures drop significantly near the water and due to the elevation.
Carry cash for small boat rentals, as digital payment infrastructure is unreliable in this mountainous area.
Pack insect repellent, as the surrounding forested areas can have high mosquito activity.
Attempting to swim in the reservoir, as strong underwater currents and deep-water drop-offs present significant safety hazards.
Maintain a respectful distance from active hydroelectric machinery and spillway zones; keep noise levels low to respect local fishing activities.
