Castle Rock Walk is a self-guided historic and floral walking experience through the heart of Castle Rock, Washington. Stroll along the Cowlitz River, explore plaques marking key moments from the town’s past, and discover how this small Pacific Northwest community became a vital hub of early Pacific Northwest commerce and settlement. Then stop to smell the flowers — the same streets that once hummed with sternwheelers and sawmills are now beautifully landscaped year-round.