Bumping Lake, Washington state, United States
Bumping Lake is a mountain reservoir in the Cascade Range surrounded by dense forest and rocky slopes. The water is held back by an earthen dam built in 1910 that stands about 60 feet (18 meters) high and was partially upgraded in the 1990s.
Early maps called this body of water Lake Plehnam in the 1850s, later known as Tannum Lake by 1897. The dam was built in 1910 to create a reservoir for storing water during rainy seasons and supplying it to farmland below.
Access is via Forest Road 70, which winds through forested land and is open in summer but can be blocked by snow in winter. The lake offers simple camping spots and fishing areas, but there are no shops or rental services nearby, so visitors should bring all needed supplies.
The lake serves as part of the Yakima Project, providing irrigation water to fruit farms in the lower Yakima Valley during the growing season. With storage capacity exceeding 33,000 acre-feet, it plays a key role in sustaining regional agriculture.
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