Editing Interstate 87 (New York) (section)

===Filling the gaps===
The gap in the Northway between Pottersville and Keeseville was narrowed considerably by July 1967 with the completion of a {{convert|25|mi|km|adj=on}} segment from Pottersville to exit&nbsp;30 at Underwood. It was closed further on July 25, 1967, with the opening of a {{convert|3|mi|km|adj=on|spell=in}} stretch near Keeseville between exits&nbsp;34 and 33.<ref>{{cite news |title = Governor Opens Link of N'Way at {{sic|Keesville|nolink=y}} |newspaper = Adirondack Life |publisher = Warrensburg–Lake George News |date = July 20, 1967 |page = 9 }}</ref> The last section of the Northway to be built, a {{convert|30|mi|km|adj=on}} stretch between Underwood and Keeseville (exit&nbsp;33), was finished on August 31, 1967.<ref name="completion">{{cite news |last = Phillips |first = McCandlish |title = Last Link to Open on the Northway |url = https://select.nytimes.com/gst/abstract.html?res=FA0A12F6345E137A93CBAB1783D85F438685F9 |access-date = December 26, 2012 |newspaper = The New York Times |date = August 29, 1967 |page = 39 }}</ref> The completion of the Northway linked New York City with Montreal by way of a direct, limited-access highway, with I-87 becoming [[Quebec Autoroute 15|A-15]] at the Canada–United States border.<ref>{{cite map |title = New York State Highways |author = [[State of New York Department of Commerce]] |year = 1969 |author2 = Rand McNally and Company |publisher = State of New York Department of Commerce }}{{full citation needed|date=August 2015}}</ref> The total cost to build the Adirondack Northway was $208&nbsp;million (equivalent to ${{formatprice|{{inflation|US-GDP|208000000|1967}}}} in {{Inflation/year|index=US-GDP}}{{Inflation/fn|index=US-GDP}}).<ref name="completion" />

Another gap in I-87 existed in downstate New York, as the plan to build I-87 along the proposed Hudson River Expressway had been scrapped by 1962. Instead, I-87 was now proposed to begin in [[Port Chester, New York|Port Chester]] and follow a new routing through [[Purchase, New York|Purchase]], [[Armonk, New York|Armonk]], and [[Katonah, New York|Katonah]] to [[Brewster, New York|Brewster]], where it would join I-84.<ref>{{cite map |title = New York and Metropolitan New York |author1 = Sinclair Oil Corporation |year = 1962 |author2 = Rand McNally and Company |publisher = Sinclair Oil Corporation }}{{full citation needed|date=August 2015}}</ref> The routing was modified slightly by 1968: I-87 still began in New York City, then [[Concurrency (road)|overlapped]] with [[Interstate 287|I-287]] east to Purchase. From there, I-87 headed north along the now-open expressway to Armonk, where it ended at [[New York State Route 22|NY&nbsp;22]]. Another portion of the highway, from Goldens Bridge ([[New York State Route 138|NY&nbsp;138]]) to Brewster, was open as well while the part from Armonk to Katonah was under construction.<ref name="1968map">{{cite map |title = New York |author1 = Esso |year = 1968 |edition = 1969–70 |author2 = General Drafting |publisher = Esso }}{{full citation needed|date=August 2015}}</ref> This segment, as well as the part from Katonah to Goldens Bridge, was completed by 1971.<ref>{{cite map |title = New York Thruway |author1 = [[New York State Thruway Authority]] |year = 1971 |author2 = Rand McNally and Company |publisher = New York State Thruway Authority }}{{full citation needed|date=August 2015}}</ref> On January 1, 1970, I-87 was rerouted between Elmsford and Newburgh to follow the mainline of the Thruway instead, leaving the Purchase–Brewster freeway to become [[Interstate 684|I-684]].<ref>{{cite book |url = http://www.greaternyroads.info/pdfs/state70.pdf |title = Official Description of Touring Routes in New York State |date = January 1, 1970 |author = State of New York Department of Transportation |access-date = May 13, 2009 }}</ref>