Some interesting facts about Merriman Falls, a water fall in the Olympic National Park on the Olympic Peninsula of Washington, USA: They stand at a height of 40 feet. The source of the water is Merriman Creek which gathers water from Quinault Ridge. They are easily accessible and can be seen along South Shore Road. The falls fan out and fall in the form of a horse tail. The falls are surrounded by fallen trees, standing trees, moss, ferns, and boulders.