This is marker number 2 on WSDOT’s website, and is located in Rockport State Park on State Route 20 at milepost 96.55.

David Douglas

The majestic Douglas fir trees towering overhead owe their name to David Douglas, the first naturalist to extensively collect in the Pacific Northwest. While gathering botanical materials for the Royal Horticultural Society of London, Douglas obtained specimens from the tree that today bears his name.
From 1825 to 1833, this intrepid Scotsman journeyed through the region by canoe, horse, and foot, often alone. He ventured up the Coumbia and Willammette rivers and briefly visited Puget Sound. His life ended in Hawaii under mysterious circumstances in 1834
In his nearly 35 years, Douglas introduced over 200 plant species to the wider world. Many today bear his name.

David Douglas Historical Marker Locator Map: Google Maps