Jusanji Reservoir

Character

Several of Jusanji’s oldest willows grow with their trunks at the reservoir’s waterline. A 2010 visitor survey found the trees had become so central to the place that roughly 60 percent of respondents said they would not revisit if the willows died

Jusanji was dug in 1720 and completed the following year as a reservoir for agriculture and drinking water. It is about 200 metres long and eight metres deep, with old willow trees that took root long after the waterworks themselves were built

The trees turned a utilitarian pond into a landscape destination. In the same survey, photographing and viewing the willow colony were the dominant reasons for visiting. It also exposed a conservation dilemma: 54 percent preferred active treatment of damaged trees, while about 30 percent favoured allowing the trees to follow a natural course even if some died

The experience

Jusanji is small enough to understand as one enclosed mountain reservoir rather than a large lake district. Forested slopes surround the water, and the old willows stand close to the shoreline and within the fluctuating water zone

The main interest is concentrated around the relationship between trees and water. The trunks, exposed roots and changing waterline make the willows physically different from ordinary roadside or park trees. A 2012 botanical survey of the Jusanji watershed recorded 377 vascular plant taxa, placing the well-known willow colony inside a broader forest ecosystem rather than an isolated ornamental planting

The reservoir also remains inside Juwangsan National Park, so access begins from a managed park gateway rather than a village street. Korea National Park Service currently uses Jusanji Parking Lot as the meeting and large-bus access point for Jusanji programmes

History

Construction began in August 1720 and was completed in October 1721. The reservoir served nearby agriculture and local water needs and developed a long reputation for retaining water even through drought

The willow colony belongs to a later layer. Many of its old trees are roughly 150 years old, and their growth along the reservoir margin gradually became the feature most strongly associated with Jusanji

By the early twenty-first century, that association had become measurable in visitor behaviour. The 2010 survey treated declining willow health as a management issue because the trees were the principal reason many respondents came. The split between active treatment and natural aging shows how difficult preservation becomes when the defining heritage element is alive

A vascular-plant survey recorded hundreds of taxa around Jusanji, while ecological work on artificial structures in the area examined how water-control features alter stream habitats. The reservoir remains both a cultural landscape and part of a functioning mountain ecosystem

Before you go

The practical gateway is Jusanji Parking Lot, which Korea National Park Service uses for current programmes and large-bus access. From there, the reservoir is approached on foot within the national-park setting