Eagle River is a relatively small river that has to go through a rough tumble to reach Lake Superior. Fenner's Falls is the middle named drop on the mile-long dash, by far the hardest one to reach. Deep in a congolmerate gorge, with no clear path and steep rock walls, most of the adventure is just getting down to the river. The waterfall is worth it, though, with two tiers and steep rock surrounding it on both sides. The upper half is made up of several plunges over dark basalt and the lower a slide over angled conglomerate.
Turn north onto M-26 from US-41 in Phoenix and drive 1.5 miles to a mailbox for '4593 M-26'. Park near here, on the east side of the road (opposite the driveway), and look for the small culvert draining into the ditch. There should be a small footpath near this drainage creek. Follow the path through the woods to the river. The path turns downstream and leads down the steep bank to the waterfall. Proceed with caution - this trail is narrow and the gorge is a long drop now.