Silver Cord Cascade
Silver Cord Cascade is a horsetail type waterfall on Surface Creek, a tributary of the Yellowstone River in Yellowstone National Park. Surface Creek flows out of Ribbon Lake off the South rim of the Grand Canyon of the Yellowstone and plunges to the Yellowstone River. It is considered the tallest waterfall in Yellowstone.
Sulphide Creek
Meltwater from the Sulphide and Crystal glaciers skips several hundred feet down a series of Shuksan greenschist cliffs into Sulphide Lake, a small and nearly inaccessible tarn at on the southeast flank of Mount Shuksan. Sulphide Creek flows out of the lake and drops down a narrow, deeply incised rock chute forming Sulphide Creek Falls, one of the tallest waterfalls in North America with an estimated height of .
According to Canyoneering Northwest, the Sulphide Creek canyon has had "no record of descent or exploration".