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Blair Gap facts for kids

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USGS overview indicating Kittanning Gap's, Pennsylvania location near Altoona, PA and showing the PRR Horseshoe Curve
This map to be one replaced focused a bit further south showing Blair Gap.
Location of Kittanning Gap after GNIS finding of 'Kittanning Gap, Pennsylvania' seen in USGS National Map viewer screenshot. The gap is located effectively in a western suburb of Altoona, PA.
 • The maps on this page also are showing the nearby PRR Horseshoe Curve which crosses three other gaps and the confluence of Kittanning Run with the indicated 'A' marker.
 • The Kittanning Gap gives this 'choice way' of climbing the escarpment to wagons or mule trains on the way to the west side of the Allegheny Mountains and Kittanning, PA along the Kittanning Path. Taking a right through the gap to climb up the escarpment was a bit easier than either steep narrow creek beds straight ahead..

Blair Gap, one of the gaps of the Allegheny is a water gap along the eastern face atop the Allegheny Ridge or Allegheny Front escarpment. Like other 'gaps of the Allegheny' the slopes of Blair Gap were amenable to foot travel, pack mules, and possibly wagons allowing Amerindians, and then, after about 1778-1780 settlers, to travel west into the relatively depopulated Ohio Country decades before the railroads were born and tied the country together with steel. Historically, the gap was used for the upper sections of the Allegheny Portage Railroad, which as was authorized by the enabling acts in 1824 of Pennsylvania's Main Line of Public Works as part of the Pennsylvania Canal System which originally envisioned linking Pittsburgh to Philadelphia by canals. In the early 1900s, US Route 22 followed alongside the watercourse through the gap.

Until around the 1920s, after new founded auto clubs gathered enough numbers to political clout to push for initiatives creating roads between towns, off the railroads the primary means of travel town to town was on foot or where hauling was needed, using wagons. There were only five ways through the Appalachians east to west: Around the bottom (plains or Piedmont area) in Georgia, the Cumberland Gap, the Cumberland Narrows, the gaps of the Allegheny Front, and up the Hudson River then around the north end of the Catskills and across upstate New York, the so-called level water route to the Great Lakes. All other transits involve difficult climbs a man on foot can only make with great difficulty, and which animal drawn transport could not. Geographically and geologically, without the large projects and engineering capabilities of the 20th century, there were exactly three internal regions where it was possible to get animal powered vehicles from the east side to the west side of the Appalachian Mountains, making five routes overall counting traveling around the plains at either end of the western chain. Below Canada, the geologic nature of successive barrier ridges of the Ridge and Valley Appalachians runs from the valley of the Hudson, the Delaware Water Gap down through all of northern Pennsylvania, sundering eastern and central Pennsylvania, Maryland and North Carolina, Virginia from the eastern Great Lakes Western Pennsylvania, West Virginia, Kentucky, and Tennessee.

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