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.
History 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.MacReynolds, George, Place Names in Bucks County, Pennsylvania, Doylestown, Bucks County Historical Society, Doylestown, PA, 1942, P1.
Statistics Threemile Run's GNIS identification number is 1189555, its Pennsylvania Department of Conservation and Natural Resources identification number is 03168. The stream drains and reaches its confluence at the Tohickon Creek's 17.60 river mile within the banks of Lake Nockamixon.
Course Threemile Run rises in West Rockhill Township, Bucks County, Pennsylvania, from an unnamed pond at an elevation of 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 , resulting in an average slope of 19.03 feet per mile (3.35 meters per kilometer).
Geology Appalachian Highlands Division Piedmont Province Gettysburg-Newark Lowland Section Brunswick Formation Diabase 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 LatitudeLongitude Pennsylvania Route 313 (Doylestown Pike, Dublin Pike)69932 Concrete Arch-Deck1930 40°24'5675°16'14"W West Rock Road751621Prestressed concrete box beam or girders-multiple1979 40°24'7.1"N75°17'1.06"W North Rockhill Road Stone Edge Road Hill Road751921Concrete Tee Beam1930 40°23'8"N75°18'27"W South Old Bethlehem Pike (Park Avenue)750221Prestressed concrete box beam or girders - Multiple1955 40°22'57.3"N75°18'45"W South Bethlehem Pike (South West End Boulevard)7385 Concrete Tee Beam, concrete cast-in-place deck, bituminous surface1936 40°22'50"N75°19'W Old Mill Road (Township Road T360)751311Continuous concrete stringer/multi-beam or girder1930 40°22'46.9"N75°19'10.2"W Forrest Road
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