I started from MAX Vanport station heading to "Vanport". No buses on weekend that goes near the area. A nice looking golf course, but its boundaries are all fenced off, including North Cottonwood Rd that is marked both accessible, and where Historic Vanport is, on Google Map. I didn't see any trace of the original Vanport, which either no longer exists or is on the golf course property. 
When walking on Columbia Slough, you have a good view of the golf course and Mt. St. Helens beyond. A few bridges, a water treatment area. That's to the north. To the south of the trail (more like a dike), you walk along the slough, you see quite a few tents and litter. Noise from a car race track. 
North Portland Rd and North Marine Drive (by Columbia River) are bordering the wetland to the east and north. Both with fast traffic and trash (I saw one pile of dead supermarket turkey -- all plucked). I'm walking on the official trail. There's a train terminal of some sort, lots of trains here. 
Smith and Bybee Lakes are swamp. I did see a few family walking here. Short paved trail, or mud to walk on. Didn't see many birds as I hoped. 
. Two entrances. The main one is to the north. It has two sheltered lookouts. Overall not worth coming, unless maybe in spring with more water and maybe a boat, or if you live in the neighborhood. A long walk from the train station (~1 hour).I much prefer Alviso Slough and Coyote Slough in the south SF Bay, which I just visited last week. What a difference.
