Unsigned I-495 highlighted in red
|Maintained by MTA|
|Length||3.70 mi  (5.95 km)|
|History||Established November 5, 2002, by
Signed in January 2004 
|West end||I‑95 / Maine Turnpike in Portland|
|East end||I‑295 / US 1 in Falmouth|
Interstate 495 (I-495) is the unsigned designation for the Falmouth Spur, a short freeway connecting I-95 with I-295 and U.S. Route 1 (US 1) north of Portland, Maine, in the United States. As part of the Maine Turnpike, the main line of which carries I-95, I-495 is a toll road. The spur has only two interchanges—one at each end—and a toll booth in the middle. It is signed only for its destinations—I-95, I-295 and US 1 —to minimize driver confusion. 
Prior to January 2004, I-495 was a 50.47-mile-long (81.22 km)  section of the Maine Turnpike, running from the west end of the Falmouth Spur (which carried Interstate 95) north to the present junction with I-295 at Gardiner (south of Augusta). This was re-signed as I-95 in order to designate the whole turnpike as I-95 and thus reduce confusion.  Most of the former I-95 between Portland and Augusta became an extension of I-295, while the short Falmouth Spur was given the unsigned Interstate 495 designation.
Destinations on signs ( control cities) are the same as when it was part of I-95— Falmouth and Freeport for eastbound traffic from I-95, and Lewiston and Kittery (one for each direction of the turnpike) for westbound traffic from US 1. Signs on I-295 southbound point traffic for New Hampshire, Massachusetts and "points south" along I-495. 
MUTCD-compliant mile markers proceed easterly from the western end with the letters FS (for Falmouth Spur) horizontally on a line below the word MILE and range from 0 to 3.
The Falmouth Spur was built as part of the second phase— Portland to Augusta—of the Maine Turnpike, opened December 13, 1955,  as well to alleviate traffic on Falmouth Road, the town's east to west connector, connecting State Route 9 (SR 9, Middle Road) with SR 26/ SR 100 (Gray Road). The spur connected interchange 8, a trumpet interchange with the mainline turnpike, with interchange 9, another trumpet at US 1 in Falmouth. (The west end later became exit 9—exit 8 was moved south to the new Westbrook interchange—and the east end became exit 15 on I-95.) The toll booth was just west of US 1, right where the spur now crosses over I-295.   The part of US 1 that it connected to had been built c. 1948 as a realignment (old US 1 is SR 88), and the spur connected the turnpike, which headed inland at Portland, with US 1, a major route to and beyond Brunswick via the shore. 
When the Interstate Highway System was designed in the 1940s and 1950s, the main route along the east coast, numbered I-95 in 1957, was assigned to the route via Brunswick to Augusta. Thus the Falmouth Spur became I-95, and the turnpike was unnumbered between the spur and Gardiner. Around 1960, the piece of I-95 (now I-295) north of the spur was completed, and a partial interchange was added at its crossing with the spur.  The toll booth was moved west at that time.[ citation needed]
The turnpike stayed unnumbered between Falmouth and Gardiner until around 1988, when it was added to the Interstate System as I-495.  This allowed it to have a speed limit higher than the National Maximum Speed Limit of 55 miles per hour (89 km/h), as per the Surface Transportation and Uniform Relocation Assistance Act of 1987.[ citation needed]
In 2002, the Maine Department of Transportation (Maine DOT) submitted a proposal to the American Association of State Highway Officials (AASHTO) to relocate I-95 along I-495 and extend I-295 along I-95 to Gardiner, leaving the Falmouth Spur unnumbered. This was approved by AASHTO on November 5, 2002, with one change—the Falmouth Spur was assigned the I-495 designation.  The Maine DOT and Maine Turnpike Authority decided not to sign or publicize I-495 to minimize confusion;  maps of the changes distributed to the public included the remark "existing I-95 becomes a ramp" or just "Falmouth Spur" pointing to the spur. Signs were changed from January 5 to 10, 2004.   A prominent sign was posted near the New Hampshire state line informing travelers of the change, and that the information center had new maps. 
|Location ||mi ||km||Destinations||Notes|
|Portland||0.00||0.00||I‑95 ( Maine Turnpike) – Boston, Augusta||Exit 52 on Maine Turnpike|
|Falmouth||2.79||4.49||Falmouth toll barrier|
|4.04||6.50||US 1 north – Yarmouth||Eastbound left exit and westbound left entrance; formerly Exits 15A (US 1 south) and 15B (US 1 north)|
|4.10||6.60||US 1 south to I‑295 south – Falmouth, Portland|
|4.36||7.02||I‑295 north – Freeport, Brunswick|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
- Special Committee on U.S. Route Numbering (November 5, 2002). "Report of the Special Committee on U.S. Route Numbering to the Standing Committee on Highways" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived (PDF) from the original on October 16, 2017.
- Maine Department of Transportation. "Interstate I-95 Redesignation & Re-numbering Information". Maine Department of Transportation. Archived from the original on February 22, 2006.
- OpenStreetMap and Contributors. "Overview Map of Interstate 495 in Maine" (Map). MapQuest. AOL. Retrieved October 5, 2014.
- "Interstate 495 Maine". Interstate Guide. Retrieved October 5, 2014.[ self-published source]
- "All Along the Interstate, New Exit Strategies". Portland Press Herald. February 23, 2003. Archived from the original on September 12, 2005.
- Federal Highway Administration (October 31, 2002). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of October 31, 2002". Route Log and Finder List. Federal Highway Administration.
- Maine Department of Transportation (2004). "Maine Interstate Redesignation" (PDF).
- Maine Turnpike Authority. "History of the Maine Turnpike Authority". Maine Turnpike Authority. Archived from the original on January 15, 2006.
- United States Geological Survey (1957). Portland quadrangle (Map). 1:62,500. 15 Minute Series. Reston, VA: United States Geological Survey – via University of New Hampshire Dimond Library Documents Department & Data Center.
- United States Geological Survey (1957). Casco Bay quadrangle (Map). 1:62,500. 15 Minute Series. Reston, VA: United States Geological Survey – via University of New Hampshire Dimond Library Documents Department & Data Center.
- National Bridge Inventory[ full citation needed]
- "I-495 Maine". Kurumi. Retrieved October 5, 2014.[ self-published source]
- "MaineDOT Public Map Viewer". Maine Department of Transportation. Retrieved April 8, 2017.
- Media related to Interstate 495 (Maine) at Wikimedia Commons