en.wikipedia.org/wiki/Cascade_Range

The National Park Service page for Annual Snowfall Totals at Mount Rainier states that Paradise "once held the world record for measured snowfall in single year in 1971-1972: 1,122 inches" and lists 1971–72: 1,122 (high) in its year-by-year table. That directly contradicts the article's statement that the record at Paradise was "in 1978." NOAA's documentation on Mount Baker's later 1,140-inch season also identifies Paradise's prior record as 1,122 inches in 1971–72, not 1978. So the claim is incorrect because it misdates the Paradise snowfall record by several years.

U.S. Geological Survey sources document a renewed eruption of Mount St. Helens from 2004 to 2008. USGS explicitly describes a "2004-2008 eruption" and a "2004-2008 dome-building eruption at Mount St. Helens" that ended in early 2008. That directly conflicts with the unqualified statement "None have erupted since St. Helens." If the sentence was meant to refer only to other long-dormant Cascade volcanoes besides Mount St. Helens, it needs that qualifier; as written, it is factually incorrect because Mount St. Helens itself erupted again after 1980.

This sentence appears to overstate the size of the Columbia Plateau by roughly a factor of three. A USGS fact sheet says "The Columbia Plateau covers more than 60,000 square miles" in Washington, Oregon, and Idaho. Another USGS overview says the Columbia River Basalt Group covers about 160,000 km², and identifies that area as the Columbia Plateau or Columbia Basin. Converting 160,000 km² gives about 61,800 square miles, which aligns with the USGS fact sheet. By contrast, 200,000 square miles would be about 518,000 km², far larger than the official USGS figures. The article likely confused square kilometers with square miles.