Federation Forest is like that gift you get on Christmas when you are expecting the best thing to be in the big box, but when you open the little box you get the real surprise. I have been going here since I was a small child and have always enjoyed it.
Just a short drive up 410 from Enumclaw there are a number of short mostly flat trails that wander through second generation Pacific Northwest woods. These trees are huge and spread out. There are even some old growth trees you can see as you follow the well beaten paths. As you enjoy your stroll you'll be overwhelmed by the beautiful mosses and fallen trees.
You can choose many paths. There is a great short loop, maybe 1/2 mile, that takes you to the White River. When you drive in you will see the visitor center on your right and pass the payment booth. Park near the end of the parking lot and you will see a little hiker sign on the right side of the parking lot. Take this trail and stay left at the 'Y'. After a short ways you come to the picnic area with a covered area. Continue on to the road for 100ft and get back on the trail. This will take you out to the river bank where you can sit in the sun on a lovely lawn with a few picnic tables and even a pit toilet if you need it. The view is excellent.
When you are ready to head back take the trail that heads down river from the grassy lawn. This trail is a bit more rugged, but you can make it! Still a very flat trail, this return trip will take you through the ever changing "edge" of the woods by the river. The sounds of rushing water lul you into wanting to slow down and admire the varieties of Northwest Giants: Sitca Spruce, Douglas Fir, Western Cedar to name a few. They are all there and have been for many years. These trees are just amazing.
Soon you will come to another intersection where you will have various signs. If your ready to head back to the parking lot then head straight, then right, then left. This will take you to the visitor center where they have a wonderful interpretive forest. The state forest has labeled the different types of plants typically found in the PNW.
If you are looking for a great place to get out and have a picnic in the woods by a river there is no better place than Federation State Forest.