This inventory identifies Bucks County’s most obvious water gaps by township as seen on 1:24,000-scale United States Geological Survey topographic maps and is not complete. Bucks County streams cross rock layers of varying resistance to erosion and many less obvious water gaps exist. Only townships containing the most obvious water gaps are listed here.
- South oriented Tohickon Creek has eroded a water gap across a Jurassic age diabase ridge before reaching Lake Nockamixon (also in East Rockhill Township).
- Where the Delaware River turns to flow in a northeast and then east and southeast direction near Narrowsville it has eroded a water gap across a diabase ridge.
- Mill Creek has eroded a water gap between Buckingham Mountain and Little Buckingham Mountain as it crosses a ridge composed of Cambrian age Hardyston Formation quartzite.
- Watson Creek has eroded a water gap as it crosses a ridge of Triassic age Stockton Conglomerate near Spring Valley.
- Rattlesnake Hill is probably a southwest continuation of Musconetcong Mountain (in New Jersey) and the Delaware River near Durham Furnace has eroded a water gap between the two.
East Rockhill Township
- South oriented Tohickon Creek has eroded a water gap across a Jurassic age diabase ridge located on the northwest side of Lake Nockamixon (also in Bedminster Township).
- Pleasant Spring Creek flows in a northwest direction as it passes through a water gap cut across a Triassic age Lockatong Formation ridge just before joining southwest oriented East Branch Perkiomen Creek.
- Mill Creek flows in a north direction through a water gap eroded across a Triassic age Lockatong Formation ridge just north of Derstines (the railroad passes this water gap).
- Neshaminy Creek flows in a west-southwest direction along the contact between the Triassic Stockon Formation to the north and Precambrian felsic gneiss to the south and then turns to flow in a south direction across the felsic gneiss before turning in a northeast direction along the contact between the felsic gneiss and the lower Paleozoic (?) age Wissahickon Formation schist.
New Britain Township
- The North Branch Neshaminy Creek has eroded a water gap across the southwest end of Plumstead Hill (north of Chalfont).
- The Delaware River flows in a south direction to near Kintnersville and then turns in a northeast direction through a water gap north of Coffman Hill.
- Ironworks Creek crosses a low Stockton Conglomerate ridge in a water gap at Holland.
- Solebury Mountain and Goat Hill (in New Jersey) are probably parts of a continuous diabase ridge, which has been cut by a south oriented Delaware River water gap.
- The southeast oriented Delaware River at Central Bridge, PA and Stockon, NJ appears to be flowing through a water gap eroded across a ridge of Triassic age Stockon Conglomerate.
Upper Makefield Township
- Bowman Hill and Belle Mountain (in New Jersey) are probably both part of the same continuous diabase ridge, which has been cut by a southeast oriented Delaware River water gap.