Sideling Hill Road Cut
Interstate 68 exposes nearly 810 feet of folded rock at Sideling Hill, with a pedestrian observation bridge reached from an open parking area.
Artwork inspired by John Ross Key
Sideling Hill makes geologic time easy to see from a highway stop. The I-68 cut reveals almost 810 feet of sedimentary strata bent into a tight syncline, with layers descending toward the center and climbing out again. From the observation bridge, the fold becomes visible rather than abstract. The exposed rock is the attraction, not a hidden cave or museum collection.
The state reopened a staffed welcome center after an earlier closure, so an older geological survey page saying the building is permanently closed is out of date. The fold is best seen from the pedestrian bridge. Use signed I-68 rest-area access, consult the geology pamphlet, and check center hours separately from outdoor overlook access.
- Rock exposure
- Nearly 810 feet
- Structure
- Tight syncline
- Viewpoint
- Observation bridge
Quick guide
- Use the bridge
- The fold is easiest to read from across the road cut.
- Separate the hours
- The staffed center and outdoor overlook have different access.
Know before you go
- Find the fold center
- Layers bend down and rise again across the cut.
- Compare bands
- Different sedimentary layers weather in different ways.
- Use the pamphlet
- Maryland Geological Survey explains the section.
- Stay on walkways
- Do not approach traffic or unstable rock.
Good to know
Older Maryland Geological Survey copy predates the Welcome Center’s reopening. The map opens the staffed rest-area complex; the geological fold and pedestrian bridge are the main reason to stop.
Notice these
- Visible syncline
- I-68 road cut
- Pedestrian bridge