When Mud Mountain Dam was completed in 1948, it stood as the tallest rock- and earth-filled dam globally. Its primary purpose was to mitigate the frequent devastating floods in South King County and North Pierce County, a historic menace to the region. The dam's reservoir holds water rich in glacier flour, which uniquely contributes to the distinctive appearance and name of the White River.
Construction of the dam was a response to the challenges faced by farmers in the White River Valley from the relentless floods dating back to the late 19th century. After years of unsuccessful attempts to manage the river, the decision to build Mud Mountain Dam was pivotal, marking a new era in flood control strategy for the region. The dam's strategic location, design, and scale have since played a crucial role in safeguarding the surrounding communities.
Boasting impressive dimensions, including a height of 432 feet and a storage capacity of 106,000 acre-feet, Mud Mountain Dam is a testament to engineering ingenuity. Over the years, the dam has undergone enhancements to ensure safety and preserve the natural habitat, notably benefiting salmon runs. Its enduring impact is evident in the substantial reduction of flood damages, estimated at over $300 million by the turn of the century.
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