Rock Creek (Monocacy River)
| Rock Creek | |
| stream | |
 The confluence of Rock and Marsh Creek is north of the Pennsylvania/Maryland border[1] by 12.7 arcseconds (c. 1907 map).
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| Country | United States |
|---|---|
| State | Pennsylvania |
| Region | Adams County |
| Townships | West: Cumberland, East: Mount Joy & Straban |
| Tributaries | |
| - from East | coordinates shown right-justified |
| - from West | coordinates shown left-justified |
| Cities | Gettysburg, PA, Barlow, PA |
| Highest point | mainstream perennial flow |
| - location | near Rentzel Road |
| - coordinates | 39°54′20″N 77°11′18″W / 39.90545°N 77.18839°W |
| Source | Susquehanna drainage divide |
| Mouth | Monocacy River |
| Basin | 65 sq mi (168 km2) |
| Roadway flooding |
1825
c. 1840 January |
| USGS feature ID | 1185250 |
| Namesakes | Civil War: Rock Creek Rangers |
On July 2, 1863, "Wiedrich's battery [of] six rifled cannon also exchanged fire with one of Jones's batteries on the opposite side of Rock Creek",[7] and snipers from a home on the East side fired on positions on the West side of the creek (on July 3, Confederates retreated across Rock Creek.)[8]
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| Website: Rock Creek Watershed (map) | |
c. 1840 January
1870 [2]
1871
1886 February 12
1889 [3]
1913 March [4]
1923 August 30 [5]
1933 August
1972 June (Hurricane Agnes)
1976
1996 June [6]
2011 September 8
Rock Creek is an 18.9-mile-long (30.4 km) tributary of the Monocacy River in south-central Pennsylvania and serves as the border between Cumberland and Mount Joy townships. Rock Creek was used by the Underground Railroad (at McAllister's Mill, "slaves would slosh through the water to throw off the tracking dogs that were pursuing them") and flows near several Gettysburg Battlefield sites, including Culp's Hill, the Benner Hill artillery location, and Barlow Knoll.
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