where is Castle Rock in relation to Seattle wa
Castle Rock, the Gateway to Mount St. Helens, is situated between the Cowlitz River and Interstate 5, located 134 miles south of Seattle and 63 miles north of Portland, Oregon. (Link to map of Castle Rock .) It is the northern most city in Cowlitz County, with a population of 2,120.Spirit Lake Memorial Highway (State Route 504) connects the city to the Mount St. Helens National Monument and Spirit Lake recreation areas â two of the most outstanding tourist attractions in Washington State.ink to our parks department for more information on community parks. Castle Rockâs historic downtown features a wide variety of shops, antique stores, restaurants, and accommodations. The townâs namesake, a 190-foot-high rock, was a landmark for Cowlitz Indians and Hudsonâs Bay Company traders as early as 1832.