Duffy Lake & Red Butte is about 12.7 miles long and located near Marion Forks, Oregon. The trail is great for hiking and normally takes a full day.
Trail up to Duffy Lake is pretty easy, with one stream crossing that was simple as well, although I hear at times it can get a bit deep in early spring.
View at Duffy Lake is amazing, the water is a bit cold but great to swim in (I'm guessing perfect temp wise by August). We camped on the West end of the lake and had a choice view of Three Fingered Jack. We did a bit of fishing and caught and released some German Brown trout.
The mosquito's were hell at the campground. This has been a late snow melt off year so I'm guessing the mosquito level is what you would normally find in late June. Make sure you have repellent.
The next day we hiked up to Duffy Butte. There isn't a trail so you will have to scramble up yourself. From the top you get amazing views of Three Fingered Jack, Mt. Jefferson, Mt. Washington, North & Middle Sister, and Broken Top.
We scrambled back down and ate some lunch before taking off for Mowich Lake and to summit Red Butte. The hike is through a 2003 forest fire so bring pleanty of sunscreen and lots of water.
Just before the trailess scramble up to Red Butte you will come across little Alice Lake. A good place to water up before heading up. Really nice views of the same mountains I mentioned before as well as Jorn Lake and the 8 Lake Basin to the North.
Overall great backpacking trip.
To get here drive 76 miles east of Salem on Hwy 22 (or 6 miles north of the Santiam "Y,") the turnoff for the trailhead is to the East Big Meadows Road 2267 for about 3 miles and follow a sign to the left when the pavement ends. A turnaround loop is at the end of the road. This is a fee-use area for parking. Free wilderness permits are also required and are available at the trailhead kiosk, and a toilet is available in the parking area.