Rock Run
Yellow Dog Road Bridge to Ralston
| Difficulty | III-IV |
| Length | 4.3 mi |
| Avg Gradient | 80 fpm |
| Gauge | Lycoming Creek Near Trout Run, Pa |
| Flow Rate as of 38 minutes | 377 cfsbelow recommended |
| Reach Info Last Updated | May 5, 2026 |
River Description
Rock Run is a super fun small watershed that offers a variety of rapids from shelves to slots and even some drops. As it fills in, most features remain recognizable, but become increasingly dynamic. After days of large rain dumps or during the snowmelt run-off, you're bound to run into some of the local boaters getting out after it while the getting is good. Like any great run, it does come with a few caveats.
1. Rock Run Valley is within stateland patrolled by DCNR officers, some whom are more than keen to dish out tickets or deny access if you don't have a valid PA launch permit. Same goes for pre/post boating activities. Consider yourself aware.
2. The access road is a narrow dirt road with limited pull-offs. In the late spring thru early fall there is a conglomerate of others utilizing the space for fishing, hiking, hunting, swimming. Consider getting your shuttle set up at the large parking area on the left as you drive over Lycoming Creek, just before entering Rock Run valley.
3. Along the run are cabins. Consider the areas around the cabins and their shoreline as private property. There is a multiude of designated social trails for access/egress.
4. Rock Run is considered a local gem, please be cognisant of your etiquette to ensure our continued access.
Generally, the put-in as just upstream of Yellow Dog Bridge. You can also shoulder your boat and follow a trail up to Yellow Dog run and beyond. Just across from the put-in gravel bar is a lone flat-topped rock. When the water is >4' below the flat-top, consider it medium high to getting real high. There are a mulitude of rapids from here down to A-Frame, some are gorged in making exiting difficult.
At medium-higher water levels, some rapids run into each other with little time for recovery. A-Frame (Upper Falls) into Corkscrew is one of these. A-Frame also has an in-play undercut just below the drop on the right, and corkscrew has a cave river right midwa
...River Features
Yellow Dog Bridge Put-in
Put in at the bridge where Yellow Dog Road crosses the river.