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Threemile Run (Tohickon Creek tributary) facts for kids

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Threemile Run
Other name(s) Three Mile Run
Country United States
State Pennsylvania
County Bucks
Township West Rockhill, East Rockhill
Physical characteristics
Main source 500 feet (150 m)
River mouth 394 feet (120 m)
Length 5.57 miles (8.96 km)
Basin features
Progression Threemile Run → Lake NockamixonTohickon CreekDelaware RiverDelaware Bay
River system Delaware River
Basin size 8.11 square miles (21.0 km2)
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.


Threemile Run's GNIS identification number is 1189555, its Pennsylvania Department of Conservation and Natural Resources identification number is 03168. The stream drains 8.11 square miles (21.0 km2) 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 Townhsip, Bucks County, Pennsylvania, from an unnamed pond at an elevation of 500 feet (150 m) 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 394 feet (120 m), 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.

Crossings and Bridges

Crossing NBI Number Length Lanes Spans Material/Design Built Reconstructed Latitude Longitude
Pennsylvania Route 313 (Doylestown Pike, Dublin Pike) 6993 12.2 metres (40 ft) 2 Concrete Arch-Deck 1930 40°24'56 75°16'14"W
West Rock Road 7516 24 metres (79 ft) 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 12|m|ft 2 1 Concrete Tee Beam 1930 40°23'8"N 75°18'27"W
South Old Bethlehem Pike (Park Avenue) 7502 9 metres (30 ft) 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 6.7 metres (22 ft) 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 9 metres (30 ft) 1 1 Continuous concrete stringer/multi-beam or girder 1930 40°22'46.9"N 75°19'10.2"W
Forrest Road
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