This weather event caused tremendous damage through out the Gorge, including taking out the picnic area at Wahkeena, and destroying the Lancaster roads at Maryhill.
"...the 1964 flood, that damaged at least 750 homes along the Sandy River. After a big snow storm hit, the weather suddenly warmed up causing the snow to melt leading to what is also referred to as 'The Christmas Flood of 1964.'"