Delaware Route 9A
|Maintained by DelDOT|
|Length:||0.78 mi (1.26 km)
Official length, signed length is 2.0 miles (3.2 km).
|South end:||DE 9 in Wilmington|
|I-495 near Port of Wilmington|
|North end:||US 13 / DE 9 in Wilmington|
Delaware Route 9A (DE 9A) is a two- to four-lane road in Wilmington, Delaware that serves as the primary access route to the Port of Wilmington as well as provide access to Interstate 495 (I-495). The official designation of the route runs 0.78 miles (1.26 km) along Terminal Avenue between DE 9 and the Port of Wilmington, interchanging with I-495. Signage has the route continuing north along Christiana Avenue to an intersection with U.S. Route 13 (US 13) and DE 9 for a total length of 2.0 mi (3.2 km). Christiana Avenue originally became a state highway in the 1920s, becoming a part of US 40 that connected to a ferry across the Delaware River to Penns Grove, New Jersey. US 40 was removed from this road in the 1930s and it later became part of DE 48, which was subsequently removed in the 1950s following the discontinuance of the ferry. DE 9A was designated by 1971.
Route description 
DE 9A begins at an intersection with DE 9 in Wilmington, heading east-southeast as two-lane undivided Terminal Avenue through residential areas. The road widens into a four-lane divided highway and comes to an interchange with I-495. Past I-495, the road heads through industrial areas, becoming an undivided road as it crosses over Norfolk Southern's New Castle Secondary railroad line at a grade crossing. The road crosses another railroad branch before reaching the entrance to the Port of Wilmington at the Christiana Avenue intersection. At this point, DelDOT officially marks the end of DE 9A, but signage shows it turning north onto Christiana Avenue.
DE 9A proceeds north-northwest as a two-lane road, passing through more industrial areas and crossing under I-495 again, this time underneath of the I-495 bridge over the Christina River. After this, the route crosses over both the Norfolk Southern's New Castle Secondary and Shellpot Branch at grade crossings in marshland. The road continues between urban residential and commercial areas to the west and industrial areas to the east before terminating at both US 13 and DE 9 near the Christina River drawbridge leading into Wilmington's central business district.
DE 9A has an annual average daily traffic count of 8,527 vehicles along Terminal Avenue. The portion of DE 9A along Terminal Avenue between I-495 and the entrance to the Port of Wilmington at Christiana Avenue is part of the National Highway System.
What is now DE 9A was a county road by 1920. By 1924, the Christiana Avenue portion of the route was constructed as a state highway. Christiana Avenue became a portion of US 40 in 1926, running from US 13 to a ferry that went across the Delaware River to Penns Grove, New Jersey. By 1931, US 40 was removed from this road. The road became the easternmost portion of DE 48 by 1936, which crossed the Delaware River on the ferry to connect to New Jersey Route 48 in Penns Grove. DE 48 was removed from this road by 1952 after the ferry between Wilmington and Penns Grove was discontinued in 1949. DE 9A was designated around 1971 onto its current alignment.
Major intersections 
|0.00||0.00||DE 9 (New Castle Avenue)||Southern terminus|
|0.78||1.26||Christiana Avenue||Official northern terminus, DE 9A signage continues north on Christiana Avenue|
|2.0||3.2||US 13 / DE 9 (South Heald Street/East 4th Street)||Signed northern terminus|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
See also 
- Google Inc. Google Maps – overview of Delaware Route 9A (Map). Cartography by Google, Inc. http://maps.google.com/maps?f=d&source=s_d&saddr=new+castle+avenue+and+terminal+avenue&daddr=39.7223339,-75.5350153+to:south+heald+street+and+christiana+avenue&geocode=FfcaXgIdbUZ_-ynFioCtpgLHiTG0xrcbCHKAcw%3BFV0dXgIdWW1_-ymvijhQqQLHiTF7zUuoJ_wc0w%3BFRZJXgIdKlZ_-ynxnqX0Wv3GiTGvaNPZv1bKwQ&hl=en&mra=ls&via=1&sll=39.72465,-75.532808&sspn=0.015051,0.042272&ie=UTF8&t=h&z=14. Retrieved February 8, 2011.
- Staff (2011). "Traffic Count and Mileage Report: Interstate, Delaware, and US Routes" (PDF). Delaware Department of Transportation. Retrieved May 17, 2012.
- Delaware Department of Transportation (2008) (PDF). Delaware Official Transportation Map (Map) (2008 ed.). http://www.deldot.gov/archaeology/historic_pres/historic_highway_maps/pdf/cd_083.pdf. Retrieved March 22, 2012.
- Federal Highway Administration (2010) (PDF). National Highway System: Delaware (Map). http://www.fhwa.dot.gov/planning/nhs/maps/de/de_delaware.pdf. Retrieved February 10, 2012.
- Delaware State Highway Department (1920) (PDF). Official Road Map (Map) (1920 ed.). http://www.deldot.gov/archaeology/historic_pres/historic_highway_maps/pdf/cd_002.pdf. Retrieved March 22, 2012.
- Delaware State Highway Department (1924) (PDF). Official Road Map (Map) (1924 ed.). http://www.deldot.gov/archaeology/historic_pres/historic_highway_maps/pdf/cd_003.pdf. Retrieved March 22, 2012.
- Bureau of Public Roads (1926). United States System of Highways (Map). http://en.wikipedia.org/wiki/Image:1926us.jpg. Retrieved April 27, 2009.
- Tydol Trails (1927). Map of New Jersey (Map). http://www.jimmyandsharonwilliams.com/njroads/1920s/maps/1927tt2.jpg. Retrieved February 9, 2011.
- Delaware State Highway Department (1931) (PDF). Official Road Map of the State of Delaware (Map) (1931 ed.). http://www.deldot.gov/archaeology/historic_pres/historic_highway_maps/pdf/cd_005.pdf. Retrieved March 22, 2012.
- Delaware State Highway Department (1936) (PDF). Official Road Map of the State of Delaware (Map). Cartography by The National Survey Co. (1936–37 ed.). http://www.deldot.gov/archaeology/historic_pres/historic_highway_maps/pdf/cd_008.pdf. Retrieved March 22, 2012.
- Delaware State Highway Department (1949) (PDF). Official Road Map of the State of Delaware (Map) (1949 ed.). http://www.deldot.gov/archaeology/historic_pres/historic_highway_maps/pdf/cd_022.pdf. Retrieved March 22, 2012.
- Delaware State Highway Department (1952) (PDF). Official Highway Map of Delaware (Map) (1952–53 ed.). http://www.deldot.gov/archaeology/historic_pres/historic_highway_maps/pdf/cd_026.pdf. Retrieved March 22, 2012.
- Delaware Department of Highways and Transportation (1971) (PDF). Delaware Highways Official Map (Map) (1971 ed.). http://www.deldot.gov/archaeology/historic_pres/historic_highway_maps/pdf/cd_050.pdf. Retrieved March 22, 2012.
- Media related to Delaware Route 9A at Wikimedia Commons