Blocher's Run is a Pennsylvania stream which flows from Oak Ridge (triple watershed point at 39°51′32″N 77°14′41″W / 39.858792°N 77.24483°W) on the Gettysburg Battlefield eastward to the Rock Creek (39°50′52″N 77°13′33″W / 39.847665°N 77.225797°W) through and near areas of the Battle of Gettysburg, First Day. During the Battle of Gettysburg Confederate soldiers took cover behind the trees that lined the stream.