Snoqualmie Falls, one of Washington state’s most popular attractions, Snoqualmie Falls is a waterfall on the Snoqualmie River. More than one million visitors come every year to watch the spectacular rush of water tumble down 270 feet/82 meters into a pool of deep, ... The Snoqualmie Falls Hydroelectric Project is Puget Sound Energy’s oldest power-generating operation and the world’s first completely underground power plant. More than a century after its construction, the facility still produces clean, cost-effective electricity for PSE customers. In addition, the hydroelectric project’s public park and trails have for decades been one of the Pacific Northwest’s most popular scenic destinations, drawing approximately 2 million visitors annually to view the majestic, 270-foot waterfalls.