In spite of old-growth trees and stunning views of waterfalls and mountains, this trail is rarely visited. Perhaps it's the bone-jarring road from the end of the pavement or the lack of any specific destination, but if you're looking for solitude close to town it's hard to beat Rock Creek Falls.
From the Dingford Creek trailhead, find the a trail opposite the Dingford Creek trail (the Dingford Trail leads to Hester and Myrtle lakes). This trail is on the river side of the parking lot. Descend half a mile southwest to a bridge over the Middle Fork Snoqualmie River. Once you've crossed the other side, turn left and head upstream. (Note that this turn is easy to miss on your return so take a look back as you continue.)
The trail undulates moderately as it follows the Middle Fork River up the valley. 2 miles from the trailhead, cross Wildcat Creek on a sturdy bridge. Two more creek crossing await you: one a half-mile past Wildcat Creek, and another a quarter-mile beyond the second crossing.
3.2 miles from the trailhead, the trail drops down and crosses Rock Creek before climbing back up to a junction with the Rock Creek Trail.
Hop on that trail (1013.1) which climbs gently, switchbacking away from the river and into the Alpine Lakes Wilderness. The trees get bigger, but never quite so big as the behemoths by the river. The trail is mostly in the forest, but at 5.1 miles from the trailhead it crosses a rock field with great views to the northwest. The best views of the falls are at 5.6 miles from an avalanche chute full of slide alder and salmonberries.
The trail continues climbing with big, lazy switchbacks to join the Snow Lake and High Lakes Trails just short of Snow Lake. Follow the High Lakes Trail to the right a short distance to the outlet of the lake and the source of Rock Creek.
WTA Pro Tip: Although this trail is great when the weather isn't ideal, you won't see the waterfall or views of the mountains if the valley is full of clouds.