Interstate 89

Interstate 89
Name	Interstate 89
Route type	Interstate Highway
Length mi	191.12
Established	1957
Direction	A=South
Terminus A	Burlington
Direction B	North
Terminus B	Highgate Springs
States	Vermont, New Hampshire

Interstate 89 is an Interstate Highway running from Burlington through Montpelier and Lebanon to the Canada–United States border at Highgate Springs. It connects the Champlain Valley with the Connecticut River corridor and serves as a principal arterial between the Greater Burlington metropolitan area, the Upper Valley, New Hampshire–Vermont, and cross-border routes to Montreal. The route supports regional commerce tied to Port of Montreal, Vermont Yankee historical freight movements, and tourism to destinations such as Stowe Mountain Resort and Shelburne Museum.

Route description

The southern terminus begins near Burlington International Airport and proceeds southeast through suburban South Burlington and Williston toward Essex Junction. The freeway parallels the Winooski River corridor, passing near Waterbury and providing access to Stowe and Morse Farm Maple Sugarworks. Continuing northward, the route traverses the state capital at Montpelier with interchanges serving the Vermont State House and connections to U.S. Route 2. Crossing into New Hampshire, the highway follows the Connecticut River valley, linking White River Junction and Windsor to the regional centers of Lebanon and Hanover, home to Dartmouth College. The corridor provides access to Dartmouth–Hitchcock Medical Center and interchanges with U.S. Route 4. Returning to Vermont north of Orford, the freeway continues through rural Caledonia County and Franklin County before terminating at the border crossing adjacent to the Philipsburg–Highgate Springs Border Crossing and connections toward Quebec Autoroute 35 and Route 133.

History

Planning for the corridor dates to pre-Interstate proposals linking Burlington to Montreal and regional capitals such as Montpelier and Concord. The highway was incorporated into the original 1956 Federal Aid Highway Act of 1956 Interstate plan under regional advocates including Vermont governors and transportation officials who coordinated with the New Hampshire Department of Transportation and the Vermont Agency of Transportation. Construction proceeded in segments through the 1960s and 1970s, with major milestones marked by openings near Burlington and the White River Junction interchange with Interstate 91. Environmental and community debates involved stakeholders like The Nature Conservancy and local preservation groups during alignments through the Green Mountains. Cross-border linkage efforts later engaged Canadian agencies and proponents from Montreal and the Champlain–St. Lawrence Regional Development Commission. Notable infrastructure projects included completion of multi-lane sections near South Burlington and reconstruction of interchanges serving Dartmouth–Hitchcock in the 1990s and 2000s under federal aid and state capital programs.

Exit list

Exits provide access to municipalities and facilities such as Burlington International Airport, Essex Junction, Williston, Waterbury, Stowe, Montpelier, Barre, Northfield, Berlin, White River Junction, Lebanon, Hanover, Orford, St. Albans, and Highgate Springs. The highway intersects major routes including U.S. 7, I-91, U.S. 2, U.S. 4, and state highways providing links to cultural sites like Shelburne Museum, Ethan Allen Homestead, and academic institutions such as Dartmouth College and University of Vermont. Service plazas and interchange numbers increase northward, with rest area spacing responding to terrain and population centers.

Services and rest areas

Facilities along the corridor include travel plazas, park-and-ride lots used by Green Mountain Transit and regional carriers, and commercial zones near Burlington and Lebanon. Rest areas and weigh stations are positioned in rural stretches near Richford and Haverhill to serve long-distance traffic bound for Montreal and northeastern New England. Emergency services coordinate with regional agencies such as Vermont State Police, New Hampshire State Police, Vermont Agency of Transportation, and hospital systems including Dartmouth–Hitchcock Medical Center and University of Vermont Medical Center for incident response and traveler assistance programs.

Traffic and safety

Traffic volumes vary from urban commuter levels in the Burlington metro area to lower rural flows in northern Franklin County; seasonal peaks occur during winter storm events and tourist periods tied to maple sugaring and winter recreation at Stowe Mountain Resort and Jay Peak Resort. Crash data prompt coordinated safety campaigns by state transportation agencies and groups such as American Automobile Association regional offices. Winter maintenance involves snowplowing strategies and anti-icing tactics developed with equipment suppliers and contractors; incident management links to the Federal Highway Administration guidance and state traffic operations centers. Freight movements include regional food, timber, and manufacturing shipments connecting to Intermodal freight terminals and links to Port of Montreal logistics chains.

Future developments

Planned projects comprise interchange reconstructions, safety upgrades, and pavement rehabilitation funded through state capital programs and federal grants administered by the Federal Highway Administration and regional planning commissions such as the Chittenden County Regional Planning Commission. Proposals for increased cross-border capacity engage Transport Canada and Québec provincial ministries to coordinate with Vermont agencies on potential extension connections to Autoroute 35. Local initiatives consider multimodal enhancements including park-and-ride expansion, transit priority measures linking to Green Mountain Transit, and bicycle-pedestrian accommodations near urban segments serving University of Vermont and downtown Burlington. Environmental reviews involve stakeholders like U.S. Fish and Wildlife Service and Vermont Natural Resources Board to balance corridor improvements with conservation goals.

Category:Interstate Highways in Vermont Category:Interstate Highways in New Hampshire