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{{Short description|
{{Cleanup reorganize|date=August 2025}}
{{Infobox landform
| water =
| name = Atlantic Seaboard fall line
| other_name =
| type = [[Escarpment]]
| photo =
| photo_width =
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| relief =
| map_image = United States Fall Line.jpg
| map_caption = Map showing part of the Eastern Seaboard Fall Line where the pale
<!-- ___location -->
| ___location = United States
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| depth =
| drop =
| formed_by = [[New Jersey]]
| geology =
| age =
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The '''Atlantic Seaboard Fall Line''', or '''Fall Zone''', is a {{convert|900|mi|km|adj=on}} [[escarpment]] where the [[Piedmont (United States)|Piedmont]] and [[Atlantic coastal plain]] meet in the [[eastern United States]].<ref name=freitag>{{cite book |last= Freitag |first= Bob |author2=Susan Bolton |author3=Frank Westerlund |author4=Julie Clark |title= Floodplain Management: A New Approach for a New Era |year= 2009 |publisher= Island Press |isbn= 978-1-59726-635-2 |page= 77 |url= https://books.google.com/books?id=e1lr3gQiO8gC&pg=PA77 |access-date= 17 November 2010}}</ref> Much of the Atlantic Seaboard fall line passes through areas where no evidence of [[faulting]] is present.
The [[fall line]] marks the geologic boundary of hard metamorphosed terrain—the product of the [[Taconic orogeny]]—and the sandy, relatively flat
Before navigation improvements, such as locks, the fall line was generally the [[wikt:head of navigation|head of navigation]] on rivers due to their rapids or waterfalls, and the necessary [[portage]] around them. Numerous cities initially formed along the fall line because of the easy river transportation to seaports, as well as the availability of water power to operate mills and factories, thus bringing together river traffic and industrial labor. [[U.S. Route 1]] and [[Interstate 95|I-95]] link many of the fall-line cities.
In 1808, [[United States Secretary of the Treasury|Treasury Secretary]] [[Albert Gallatin]] noted the significance of the fall line as an obstacle to improved national communication and commerce between the Atlantic seaboard and the western river systems:<ref>[Report on] Roads and Canals, Communicated to the Senate April 4, 1808, [http://memory.loc.gov/cgi-bin/ampage?collId=llsp&fileName=037/llsp037.db&recNum=736 p.729]</ref>
{{quote|The most prominent, though not perhaps the most insuperable obstacle in the navigation of the Atlantic rivers, consists in their lower falls, which are ascribed to a presumed continuous granite ridge, rising about one hundred and thirty feet above tide water. That ridge from New York to James River inclusively arrests the ascent of the tide; the falls of every river within that space being precisely at the head of the tide; pursuing thence southwardly a direction nearly parallel to the mountains, it recedes from the sea, leaving in each southern river an extent of good navigation between the tide and the falls. Other falls of less magnitude are found at the gaps of the [[Blue Ridge Mountains|Blue Ridge]], through which the rivers have forced their passage...}}▼
▲{{
Gallatin's observation was sound, though simplified and limited by the knowledge of his time. The limits of the Fall Line are subject to some dispute. In the north, the fall line is usually understood to have its northern limit at New Brunswick, a geologic continuation in fact crosses the [[Hackensack River|Hackensack]] and [[Passaic River|Passaic]] Rivers at the cities of those names, to which navigation was possible. In the south, some such as Gallatin above, and the USGS source in the infobox, imply its end to be in the Carolinas or Georgia, and to include only rivers running to the Atlantic; but it is more accurate, as the Georgia source in the infobox does, to trace it farther west through Georgia and Alabama, as that is the geologic continuation.<ref>[https://www.loc.gov/ghe/cascade/index.html?appid=8caec0ea0f45442396e539c227ee192c], especially the first section and maps.</ref>
== Cities and towns ==
Only the principal city of an area is listed below. However, two cities may belong on one river, if the one downstream is at the effective head of navigation and the one upstream at the site of useful water power.
Some cities that lie along the Piedmont–Coastal Plain fall line include the following (from north to south):
* [[
* [[Trenton, New Jersey]], on the [[Delaware River]].<ref name=freitag/>
* [[Philadelphia|Philadelphia, Pennsylvania]], on the [[Schuylkill River]].<ref name=shamsi>{{cite book |last= Shamsi |first= Nayyar |title= Encyclopaedia of Political Geography |year= 2006 |publisher= Anmol Publications |isbn= 978-81-261-2406-0 |pages= 92–93 |url= https://books.google.com/books?id=4Z2Kh7ELI0oC&pg=PA92 |access-date= 17 November 2010}}</ref>
* [[Wilmington, Delaware]], on the [[Brandywine Creek (Christina River tributary)|Brandywine River]].
*
* [[Baltimore|Baltimore, Maryland]], on [[Herring Run]], [[Jones Falls]], and [[Gwynns Falls]].<ref>{{cite web |url= http://www.mgs.md.gov/geology/ |title= Maryland Geology |publisher= Maryland Geological Society |access-date= 25 January 2017}}</ref>
* [[Washington, D.C.]], on the [[Potomac River]].<ref name=deane>{{cite book |last= Deane |first= Winegar |title= Highroad Guide to Chesapeake Bay |year= 2002 |publisher= John F. Blair |isbn= 978-0-89587-279-1 |page= 5 |url= https://books.google.com/books?id=bMejFkODGIcC&pg=PA5 |access-date= 17 November 2010}}</ref>
* [[Fredericksburg, Virginia]] on the [[Rappahannock River]].<ref name=deane/>
* [[Richmond, Virginia]], on the [[James River]].<ref name=roberts>{{cite book |last= Roberts |first= David C. |author2=W. Grant Hodsdon |editor= Roger Tory Peterson |title= A Field Guide to Geology: Eastern North America |year= 2001 |publisher= Houghton Mifflin Harcourt |isbn= 978-0-618-16438-7 |page= 242 |url= https://books.google.com/books?id=zNJO2VBVRPIC&pg=PA242 |access-date= 17 November 2010}}</ref>
* [[
* [[
* [[
* [[
* [[
* [[
* [[
==Geographic coordinates==
{{Expand list|date=June 2010}}
{|class="wikitable"
Line 106 ⟶ 102:
|rowspan=2 |[[New Jersey]]
| [[New Brunswick, New Jersey|New Brunswick]] ([[Raritan River]])
| {{convert|460|ft|m|abbr=on}} <small>{{
| ▼
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| [[Trenton, New Jersey|Trenton]] ([[Delaware River]])
| align=right |<small>{{
| 8 ft
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|rowspan=1 |[[Pennsylvania]]
|[[Philadelphia]] ([[Schuylkill River]] by [[Interstate 76 (east)|I-76]])
| align=right |<small>{{Coord|39|57|13|N|75|10|17|W|region:US-PA_type:city}}</small>
|
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Line 123 ⟶ 118:
|rowspan=1 |[[Delaware]]
|[[Wilmington, Delaware|Wilmington]] ([[Brandywine Creek (Christina River)|Brandywine Creek]])
| align=right |<small>{{Coord|39|44|42|N|75|32|54|W|region:US-DE_type:city}}</small>
|▼
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|rowspan=1 |[[Delaware]]
|[[Newark, Delaware|Newark]] ([[White Clay Creek (Christina River)|White Clay Creek]])
| align=right |<small>{{Coord|39|40|39|N|75|45|26|W|region:US-DE_type:city}}</small>
|
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|-
| [[Ellicott City, Maryland|Ellicott City]]<ref>{{Cite web|title=History/Culture |url=http://www.patapscoheritagegreenway.org/history/HistPersp.html |publisher=PatapscoHeritageGreenway.org |access-date=2010-09-07 |quote=
| align=right |<small>{{
|
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|▼
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| [[Little Falls (Potomac River)]]
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|
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| rowspan="3" | [[Virginia]]
| [[Fredericksburg, Virginia|Fredericksburg]] ([[Rappahannock River|Rappahannock]])
| align=right |<small>{{
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| [west of [[Interstate 95]] bridge]<ref>{{Cite web |title=Fall Line |url=http://www.virginiaplaces.org/regions/fallshape.html |publisher=VirginiaPlaces.org |access-date=2010-08-13}}</ref>
|[[Richmond, Virginia|Richmond]] ([[James River]])
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| [[Emporia, Virginia|Emporia]] ([[Meherrin River]])<ref>{{Cite web |title=River and "Fall Line" Cities |url=http://www.virginiaplaces.org/vacities/24river.html |publisher=VirginiaPlaces.org |access-date=2010-08-13}}</ref>
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[[Category:East Coast of the United States]]
[[Category:Escarpments of the United States]]
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