Trestle Falls is among Marquette County's most impressive sights and is also one of the least known waterfalls. The LS&SI railroad crosses an steep river gorge here, reaching over to a sheer rock cliff that rises up impossibly high above the water. Below the towering steel trestle the water pours over a two-tiered drop, the first a narrowing slide into a deep gouge in hard, exposed rock and the lower a tumbled slide tortured by giant blocks of rock. Below these falls the river calms down, entering a sluggish swamp for several miles before entering a more famous set of falls in Marquette.
Take County Road 502 from US-41, a right turn about 2.5 miles west of Marquette, up to County Road 510. Stay on 510 for 2.5 miles before turning right on Neejee Road. Neejee Road is a winding dirt road on the north side of McClure Basin with a lot of sidetracks leading off to various housing areas. Stick to the main road for 1.2 miles before turning right on McClure Storage Basin Road which will take you to the dam after .9 miles.
The easiest approach is to head directly to Trestle Falls, passing by the dam. Walk down the hill until you bump into the penstock from the dam (it was buried last time I visited and made an odd, straight mound through the woods). Follow the penstock east, away from the dam, until it starts a lazy turn left around a swampy little valley. Turn right with the ATV trail here.
Follow the ATV trail into the woods, avoiding the hunting blind on the way, for a short time. At some point you may be able to see the railroad through the woods (depending on the time of year), which should be before the trail curves back towards the penstock. Head down the hill to the tracks, following it to the right until you bump into the river (maybe a hundred yards along the tracks), before heading down to the river. There is a sign posted warning to stay off the trestle.
From Trestle Falls you can head upstream along the river to Upper Dead River Falls and McClure Dam Falls. The banks are steep and difficult, though not impossible, and a few trials began to crop up near the upper falls.