Marble Mountain-Trout Creek Hill volcanic field (MMTC) is a volcanic field located in Washington, US. Notable Vents Trout Creek Hill Trout Creek Hill is a small Pleistocene basaltic shield volcano in Washington, United States. It produced a lava flow about 340,000 years ago that traveled southeast, which dammed the Columbia River for a short period of time. West Crater West Crater is a small andesitic lava dome with associated lava flows in southern Washington. See also List of volcanoes in the United States References Cascade Volcanoes Lava domes Pleistocene shield volcanoes Volcanoes of Skamania County, Washington Volcanic fields of Washington (state) Volcanoes of Washington (state) Gifford Pinchot National Forest