Blue Mountain (Pennsylvania)
|Kittatinny Mountain (and nine others:
• Blue Hills, • Kau-ta-tin-chunk, • Kekaghtenemin Mountain
• Kightotinning Mountain, • Kittachtinny Hills,
• Kittatinhy Mountain, • Kittochtinny Hills,
• Kittochtinny Mountains, • North Mountain)
The "Great Wall" of Blue Mountain
|Peak||Clarks Knob 2,320 feet (710 m)|
|Elevation||1,129 ft (344 m) |
|Length||150 mi (240 km) northeast-southwest to SSW 150 miles (240 km) (direct aerial)
255 miles (410 km) trace of ridgeline, including loops back
width = varies along chain's length
|Borders on||Ridge-and-Valley Appalachians and Great Appalachian Valley|
|Age of rock||Silurian|
|Type of rock||Tuscarora Formation and Shawangunk Formation; sedimentary|
Blue Mountain Ridge, Blue Mountain, or the Blue Mountains of Pennsylvania is part of the geophysical makeup of the Ridge-and-Valley Appalachians in the U.S. state of Pennsylvania. It is a ridge that forms the southern and eastern edge of the Appalachian mountain range spanning over 255 miles (410 km) from the Delaware Water Gap as it cuts across the eastern half of the state on a slight diagonal from New Jersey tending southerly until it turns southerly curving into Maryland, and beyond.
Some distant view of The Blue Mountain dominates the southern tier of most eastern and central Pennsylvanian counties providing an ever visible backdrop cutting across the northern or western horizon. Most transport corridors and road beds piercing the barrier necessarily descend through either large water gaps (West to east: Susquehanna, Schuylkill, Lehigh and Delaware River valleys) or wind gaps their smaller tributary gaps cut by creeks, brooks, and lesser rivers. The descent into the southern lowlands are ramplike and before southbound travelers oft lays a scenic panorama spread from horizon to horizon. The barrier ridge forms a distinct boundary between a number of Pennsylvania's geographical and cultural regions.
To the north of the Susquehanna Gap in the south-central part of the state are the Cumberland Valley tucked in the area above the water gap as if trying to flow through with the river; to its northwest side are the southern reaches of the Susquehanna Valley with picturesque streams channeling travel corridors deep into and over the central and western mountains and valleys — the heartland interior counties of Pennsylvania; along the Main Branch Susquehanna, the valleys also lead into northeast Pennsylvania, into the "Northern Coal Region," of the Wyoming Valley and the distant Poconos. To the Blue Mountain Ridge's center, on the southern side lies the "capital region," about Harrisburg and nearby communities, the rich farming country of the Lebanon Valley, and Pennsylvania Dutch Country of York and Lancaster Counties, the lower half of the Lehigh Valley and the lower Delaware Valley; the latter two extend through water gaps beyond the ridgeline.
The ridge of Blue Mountain runs for 150 miles (240 km) through Pennsylvania, reaching an elevation of 2,270 feet (690 m) above sea level just north of the Pennsylvania Turnpike, near the borough of Newburg. Most of the ridgecrest, however, only reaches between 1,400 feet (430 m) and 1,700 feet (520 m) in elevation. The mountain's width varies from 1 mile (1.6 km) to 3 miles (4.8 km).
The southwestern end of the mountain is at Big Gap, west of Shippensburg. (The mountain ridge continues to the southwest towards Maryland under the name of Broad Mountain.) The northeastern end of the mountain is at the Delaware Water Gap on the New Jersey border. Mount Minsi forms the promontory overlooking the Delaware River. The ridge of Blue Mountain continues northeast into New Jersey as Kittatinny Mountain.
Four of Pennsylvania's major rivers cut through Blue Mountain in water gaps.
- The Delaware River, which forms Pennsylvania's eastern border with New Jersey, passes through the ridge just southeast of Stroudsburg.
- The Lehigh River, which feeds the Delaware at Easton, passes through the ridge near Palmerton.
- The Schuylkill River, which feeds the Delaware at Philadelphia, passes through the ridge just north of Hamburg.
- The Susquehanna River, which feeds the Chesapeake Bay, passes through the ridge just north of Harrisburg, Pennsylvania's capital.
The Pennsylvania Turnpike
The Pennsylvania Turnpike system passes through the Blue Mountain at two points.
- The Blue Mountain Tunnel carries the Turnpike's east-west mainline (Interstate 76) through the ridge in northern Franklin County. The Kittatinny Mountain Tunnel bores through a parallel ridge of the same mountain just to the west, with the two tunnel portals only 0.2 miles (0.32 km) apart.
- The Lehigh Tunnel, so named to avoid confusion with the former, carries the Turnpike's north-south Northeast Extension (Interstate 476) through the ridge between Lehigh and Carbon Counties.
Both tunnels (each consisting of two tubes) carry two lanes in each direction of travel.
Blue Mountain attractions in Pennsylvania
- The Appalachian Trail is concurrent with the top of the ridge from New Jersey to northern Lebanon County.
- Hawk Mountain Sanctuary is located at the very northern edge of Berks County.
- Hawk Mountain Ranger School, located just south of the Sanctuary, trains Civil Air Patrol members for Search and Rescue.
- Blue Mountain Ski Area is found on the north face of the ridge in the southeastern corner of Carbon County.
- Delaware Water Gap National Recreation Area reaches across Northampton, Monroe, and Pike Counties and into New Jersey, mostly to the northwest of the ridge.
- Boyd Big Tree Preserve Conservation Area in Dauphin County
- "Blue Ridge Mountain". Geographic Names Information System. United States Geological Survey. Retrieved 2017-03-29.
- "Blue Mountain". Geographic Names Information System. United States Geological Survey. Retrieved 2009-02-07.
- What's in a name, Spanning the Gap newsletter of the Delaware Water Gap National Recreation Area, Summer 1984
- "Clarks Knob". Geographic Names Information System. United States Geological Survey. Retrieved 2009-02-08.
- Measured along ridge point by point using maps.google.com ruler tool, anchored on New Jersey border, to Maryland border., 29 March 2017.
- U.S. Geological Survey 1:24,000-scale and 1:250,000-scale topographic map series