| Rock Run | |
| Pushpin Map: | USA Pennsylvania |
| Pushpin Map Size: | 250 |
| Pushpin Map Caption: | Rock Run |
| Pushpin Map Alt: | pushpin map showing location of Rock 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: | Lower Makefield Falls |
| Length: | 4.81miles |
| Source1 Elevation: | 150feet |
| Mouth Elevation: | 33feet |
| Progression: | Rock Run → Martins Creek → Delaware River → Delaware Bay |
| River System: | Delaware River |
| Basin Size: | 4.87sqmi |
| Bridges: | Stony Hill Road David Terrace Esther Lane Derbyshire Road Makefield Road Big Oak Road Kent Drive Valley Road Alden Avenue West Trenton Avenue Pine Grove Road U.S. Route 1 (Lincoln Highway) SEPTA Railroad Newbold Road Tyburn Road |
| Custom Data: | Slope |
| Extra: | 24.32ft/mi |
Rock Run is a tributary of Martins Creek in Lower Makefield Township in Bucks County, Pennsylvania in the United States.
Rock Run was entered into the Geographic Names Information System of the U.S. Geological Survey on 2 August 1979 as identification number 1185276. It is also listed in the Pennsylvania Gazatteer of Streams as identification number 02922.
Rock Run rises near Big Oak Road and Stony Hill Road in the southern portion of Lower Makefield Township at an elevation of approximately 150feet and is generally east oriented until river mile 2.87 where it makes a 90° turn to the right flowing south as it receives a tributary from the left. After about a mile it then turns east, then south and southwest until it discharges at Martins Creek's 3.20 river mile.[1]
Rock Run rises in the Felsic Gneiss formation laid during the Precambrian, light buff to pink and medium to fine grained rock, mineralogy includes quartz, microcline, pyroxene, and biotite. As it flows east, it runs into the Pensauken and Bridgeton Formations laid down during the Tertiary period, yellow to reddish brown feldspathic quartz sand, coarse gravel, and boulder. Then it finally flows into the Trenton Gravel Formation from the Quaternary, consisting of feldspathic quartz sand which is reddish brown, yellow, and white, with some beds of gravel.[2]
| Crossing | NBI Number | Length | Lanes | Spans | Material/Design | Built | Reconstructed | Latitude | Longitude | |
|---|---|---|---|---|---|---|---|---|---|---|
| Stony Hill Road | - | - | - | - | - | - | - | - | - | |
| David Terrace | - | - | - | - | - | - | - | - | - | |
| Esther Lane | - | - | - | - | - | - | - | - | - | |
| Derbyshire Road | - | - | - | - | - | - | - | - | - | |
| Makefield Road | - | - | - | - | - | - | - | - | - | |
| Big Oak Road | 7198 | 10m (30feet) | 2 | 2 | Concrete slab | 1955 | - | 40°12'32"N | 74°49'8.64"W | |
| Kent Drive | - | - | - | - | - | - | - | - | - | |
| Valley Road | - | - | - | - | - | - | - | - | - | |
| Alden Avenue | 7606 | 8m (26feet) | 2 | 1 | Prestressed concrete box beam or girders - multiple | 1962 | - | 40°12'17.1"N | 74°48'41"W | |
| West Trenton Avenue | 7219 | 9m (30feet) | 2 | 1 | Concrete continuous stringer/multi-beam or girder | 1920 | 1940 | 40°12'6.2"N | 74°48'33.8"W | |
| Pine Grove Road | 7310 | 10m (30feet) | 2 | 1 | Concrete Tee beam | 1957 | - | 40°11'57.2"N | 74°48'10.27"W | |
| U.S. Route 1 (Lincoln Highway) | 6746 | 10m (30feet) | 3 | 1 | Prestressed concrete box beam or girders - single or spread | 1954 | 1985 | 40°11'49.1"N | 74°47'53.25"W | |
| SEPTA Railroad | - | - | - | - | - | - | - | - | - | |
| Newbold Road | 7355 | 18m (59feet) | 2 | 2 | Concrete Tee Beam | 1954 | - | 40°11'36.7"N | 74°47'53.93"W | |
| Tyburn Road | 7184 | 26m (85feet) | 2 | 2 | Concrete tee beam | 1954 | - | 40°10'50.2"N | 74°48'24.87"W |