A place in United States, Cathlamet is an interesting place to visit, given its unique culture, history and character. The nearest major city to Cathlamet is Portland. Attractions in Portland include Columbia River Gorge National Scenic Area, Portland Japanese Garden, International Rose Test Garden. Also, to reach Cathlamet, you'll have to take a flight to Portland; so its not really a detour. And even if it is, the city is worth paying at least a quick visit. 1-2 days is an ideal duration of visit to Cathlamet.
Yes,it is that simple really! Enjoy your trip! Keep travelling!