| Threemile Run | |
| Name Other: | Three Mile Run |
| Pushpin Map: | USA Pennsylvania |
| Pushpin Map Size: | 250 |
| Pushpin Map Caption: | Threemile Run |
| Pushpin Map Alt: | pushpin map showing location of Threemile Run |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Pennsylvania |
| Subdivision Type3: | County |
| Subdivision Name3: | Bucks |
| Subdivision Type4: | Township |
| Subdivision Name4: | West Rockhill, East Rockhill |
| Length: | 5.57miles |
| Source1 Elevation: | 500feet |
| Mouth Elevation: | 394feet |
| Progression: | Threemile Run → Lake Nockamixon → Tohickon Creek → Delaware River → Delaware Bay |
| River System: | Delaware River |
| Basin Size: | 8.11sqmi |
| Waterbodies: | Lake Nockamixon |
| Bridges: | Forrest Road Old Mill Road South Bethlehem Pike (South West End Boulevard) Hill Road Stone Edge Road North Rockhill Road West Rock Road Pennsylvania Route 313 (Doylestown Pike, Dublin Pike) |
Threemile Run (Three Mile Run) is a tributary of the Tohickon Creek in Bucks County, Pennsylvania in the United States and is part of the Delaware River watershed.
Threemile Run was named so long before it was so noted in John Scully's map of the Province of Pennsylvania in 1770. It flows in the first valley north of the East Branch Perkiomen Creek and powered several grist mills in its early days.[1]
Threemile Run's GNIS identification number is 1189555, its Pennsylvania Department of Conservation and Natural Resources identification number is 03168. The stream drains 8.11sqmi and reaches its confluence at the Tohickon Creek's 17.60 river mile within the banks of Lake Nockamixon.
Threemile Run rises in West Rockhill Township, Bucks County, Pennsylvania, from an unnamed pond at an elevation of 500feet next to Catch Basin Road and flows southeast, south, then southeast and meets a tributary from the right bank, then turns right to flow northeast. Threemile drained into the Tohickon Creek before the Tohickon was dammed in 1972 to form Lake Nockamixon. After the lake was formed, it drains into the lake about ¾ mile from the Tohickon at an elevation of 394feet, resulting in an average slope of 19.03 feet per mile (3.35 meters per kilometer).
The Brunswick Formation is a sedimentary layer of rock consisting of mudstone, siltstone, and beds of green, brown, and red-brown shale. Mineralogy consists of argillite and hornfels. About 200 million years ago, magma intruded into the Brunswick and cooled quickly forming a fine grained diabase consisting of primarily labradorite and augite. Haycock Mountain (on the right bank of the creek) and several other features in the area are remnants of the intrusion after the Brunswick has eroded away over time. The first mile or so of Threemile Run's course is located in a region of diabase rock which intruded into the local sedimentary layers of the Brunswick Formation during the Jurassic and the Triassic, then the remaining course flows over the Brunswick Formation.[2]
| Crossing | NBI Number | Length | Lanes | Spans | Material/Design | Built | Reconstructed | Latitude | Longitude |
|---|---|---|---|---|---|---|---|---|---|
| Pennsylvania Route 313 (Doylestown Pike, Dublin Pike) | 6993 | 12.2m (40feet) | 2 | Concrete Arch-Deck | 1930 | 40°24'56 | 75°16'14"W | ||
| West Rock Road | 7516 | 24m (79feet) | 2 | 1 | Prestressed concrete box beam or girders-multiple | 1979 | 40°24'7.1"N | 75°17'1.06"W | |
| North Rockhill Road | |||||||||
| Stone Edge Road | |||||||||
| Hill Road | 7519 | 12m (39feet) | 2 | 1 | Concrete Tee Beam | 1930 | 40°23'8"N | 75°18'27"W | |
| South Old Bethlehem Pike (Park Avenue) | 7502 | 9m (30feet) | 2 | 1 | Prestressed concrete box beam or girders - Multiple | 1955 | 40°22'57.3"N | 75°18'45"W | |
| South Bethlehem Pike (South West End Boulevard) | 7385 | 6.7m (22feet) | Concrete Tee Beam, concrete cast-in-place deck, bituminous surface | 1936 | 40°22'50"N | 75°19'W | |||
| Old Mill Road (Township Road T360) | 7513 | 9m (30feet) | 1 | 1 | Continuous concrete stringer/multi-beam or girder | 1930 | 40°22'46.9"N | 75°19'10.2"W | |
| Forrest Road | |||||||||