Turn off Highway 58 (Willamette Pass area) at the sign for Waldo Lake, 3 miles west of the Willamette Pass summit. Follow the paved road 5897 for 2 miles, to the trailhead sign on the left. Park on the shoulder on the right. This is the Fuji Mountain Trailhead.
Follow the trail at the trailhead. The path climbs steeply for about a mile, and then goes through a broad, wooded benchland. At the 3-mile mark, you will encounter Birthday Lake, a small, tree-lined, swimmable pond. Just beyond Birthday Lake is Verde ("Green" in Spanish) Lake. The lake water does indeed look green from the trail. Continue another 0.2 mile to a trail junction. Turn right and follow the trail to another junction. Take another right and continue 1.2 miles to the summit of Fuji Mountain. The view of Waldo Lake and the Willamette Pass area is excellent.
Round-trip distance is 11.2 miles.
Elevation gain is about 2200 feet.
Water. It can get hot here in the summer, and the only water sources are the lakes on the lower part of the trail. A map might be useful. A good map of the area is the USFS map "Waldo Lake Wilderness."
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