Tunnel

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Armstrong Tunnel (Allegheny County, Pennsylvania)
Tunnel on S. Tenth Street between Forbes Avenue and 2nd Avenue
Atlantic Avenue Tunnel (Kings County, New York)
Backwards Tunnel (Sussex County, New Jersey)
Bullion Tunnel (Shoshone County, Idaho)
Chesapeake Bay Bridge-Tunnel (Northampton County, Virginia)
18-mile long bridge-tunnel carrying US-13 across the mouth of Chesapeake Bay between Virginia Beach and Cape Charles, Virginia
Cincinnati and Whitewater Canal Tunnel (Hamilton County, Ohio)
Lost Tunnel on Formerly Cincinati & Whitewater Canal
Cotter Tunnel (Marion County, Arkansas)
Tunnel on the Missouri & Northern Arkansas Railroad (formerly Missouri Pacific) just northwest of Cotter
Culvert Road Tunnel, near Medina, NY (Orleans County, New York)
Only road UNDER the Erie Canal
Cumberland Mountain Tunnel (Franklin County, Tennessee)
Detroit River Railroad Tunnel (Wayne County, Michigan)
Diversion Tunnel (Kenai Peninsula Borough, Alaska)
Eight-Foot High Speed Tunnel (Hampton, Virginia)
Full Scale Tunnel (Hampton, Virginia)
Gunnison Tunnel (Montrose County, Colorado)
Hoosac Tunnel (Berkshire County, Massachusetts)
Housatonic Railroad Tunnel (Fairfield County, Connecticut)
A rock tunnel near the summit of the Housatonic RR grade at Hawleyville.
Howard Street Tunnel (Baltimore, Maryland)
Jenson Tunnel (Le Flore County, Oklahoma)
Tunnel under Backbone Mountain on KCS Railway
Joralemon Street Tunnel (New York County, New York)
Montgomery Bell Tunnel (Cheatham County, Tennessee)
Mount Baker Ridge Tunnel (King County, Washington)
NY&NE Railroad Tunnel (Fairfield County, Connecticut)
Abandoned tunnel built by the New York & New England RR; concrete lined by the New Haven RR in 1911.
Paw Paw Runnel (Allegany County, Maryland)
Chesapeake & Ohio Canal Tunnel
Poland Tunnel (Yavapai County, Arizona)
Ptarmigan Tunnel (Flathead County, Montana)
Pyatt Tunnel (Marion County, Arkansas)
Tunnel on the Missouri and Northern Arkansas Railroad (formerly Missouri Pacific) southeast of Pyatt
Quitaque Railway Tunnel (Floyd County, Texas)
Rocheport Tunnel (Howard County, Missouri)
Rockland Tunnel (Venango County, Pennsylvania)
Shepaug Railroad Tunnel (Litchfield County, Connecticut)
Abandoned tunnel of the Shepaug, Litchfield, and Northern RR in Roxbury.
St. Clair River Tunnel (St. Clair County, Michigan)
Tunnel under St. Clair River on Canadian National Railroad in Port Huron
Staple Bend Tunnel (Cambria County, Pennsylvania)
Twin Culverts (Pike County, Illinois)
Union Canal Tunnel (Lebanon County, Pennsylvania)
Unitary Plan Wind Tunnel (Santa Clara County, California)
Variable Density Tunnel (Hampton, Virginia)
Washburn Tunnel (Harris County, Texas)
West Barretts Tunnel (St. Louis County, Missouri)
Preserved railroad tunnel at the National Museum of Transportation
Westmoreland Tunnel (Sumner County, Tennessee)