The Beavertail Tunnel, in De Beque Canyon, is the first of five eastbound tunnels along Interstate 70 across the state of Colorado. 08/10/16

Underground Tunnels

  • I-H3 – Trans-Koolau Tunnel and Hospital Rock Tunnel on the island of Oahu in Hawaii
  • I-5 – under Interstate Park in Seattle, Washington
  • I-10 – Deck Park Tunnel in Phoenix, Arizona at Milepost 144 under Margaret T. Hance Deck Park
  • I-15 – Tunnel under Teralta Park in the City Heights neighborhood of San Diego, California
  • I-35 – Duluth, Minnesota
  • I-40 – western North Carolina, between state line and U.S. 74 near Great Smoky Mountains
  • I-64 – Cochran Hill Tunnel, Louisville, Kentucky
  • I-64/77 – Memorial Tunnel, West Virginia Turnpike – former route; no longer in use
  • I-70 – Beavertail Mountain Tunnel in De Beque Canyon, Colorado
  • I-70 – Glenwood Canyon, Colorado: No Name Tunnel
  • I-70 – Glenwood Canyon, Colorado: Hanging Lake Tunnel
  • I-70 – Glenwood Canyon, Colorado: Reverse Curve Tunnel (westbound only)
  • I-70 – Dwight D. Eisenhower Tunnel and Edwin Johnson Tunnel (Straight Creek Tunnels) in Colorado (NOTE: These are the highest tunnels and the highest Interstate highway on the entire system.)
  • I-70 – Idaho Springs Twin Tunnels, Colorado
  • I-70 – Wheeling, West Virginia
  • I-71 – Lytle Park Tunnel, Cincinnati, Ohio
  • I-76/70 – Pennsylvania Turnpike: Allegheny Mountain
  • I-76 – Pennsylvania Turnpike: Tuscarora Mountain
  • I-76 – Pennsylvania Turnpike: Kittatinny Mountain
  • I-76 – Pennsylvania Turnpike: Blue Mountain
  • I-77 – Virginia, Big Walker Hill Tunnel north of I-81/Wytheville
  • I-77 – tunnel at Virginia – West Virginia state line near Bluefield
  • I-80 – in Green River, Wyoming
  • I-80 – Carlin Tunnel between Carlin and Elko, Nevada along Humboldt River near Milepost 276
  • I-80 – cut and cover tunnel in downtown Reno, Nevada, at the Virginia Street interchange; a Walgreens store is located prominently on top of the deck
  • I-80 – Yerba Buena Island Tunnel on San Francisco-Oakland Bay Bridge in California
  • I-84 – Toothrock Tunnel (Located between Bonneville Dam and Eagle Creek exits; built in the 1930s as an improvement to U.S. 30. The tunnel bypassed a narrow viaduct built on a cliff around 1916. When the freeway was built as part of Interstate 80N, the eastbound lanes were routed through the tunnel and a viaduct was built for the westbound lanes. The westbound viaduct skirts the side of the mountain below the 1916 viaduct, which was recently reopened as a bike path. [Thanks to Andy Ransom for this entry.])
  • I-90 – Mount Baker Tunnels in Seattle, Washington adjacent to the Mercer Island floating bridges
  • I-90 – “Snow Tunnel,” a concrete snowshed protecting the westbound lanes in the Cascade Mountains. Since demolished.
  • I-90 – Central Artery Tunnel (Big Dig) under downtown Boston, Massachusetts, connects directly to Tip O’Neill Tunnel.
  • I-93 – Central Artery Tunnel (Big Dig) under downtown Boston, Massachusetts
  • I-94 – Lowry Hill Tunnel – downtown Minneapolis, Minnesota
  • I-195 – Fall River City, Massachusetts, under City Hall
  • I-210 – cut and cover tunnel in La Canada Flintridge near California 2 interchange
  • I-279 – Fort Pitt Tunnel, Pittsburgh
  • I-285 – under Hartsfield International Airport runway in Atlanta, Georgia
  • I-376 – Squirrel Hill Tunnel, Pittsburgh
  • I-395 – Capitol Mall Tunnel in Washington, DC
  • I-476 – Pennsylvania Turnpike (Northeastern Extension): Lehigh Tunnel
  • I-540 – Bobby Hopper Tunnel north of Fort Smith, Arkansas

Tunnels Underwater

  • I-10 – Wallace Tunnels under Mobile River in Mobile, Alabama
  • I-64 – Hampton Roads Tunnel near Norfolk and Hampton Roads, Virginia
  • I-78 – Holland Tunnel under Hudson River between New Jersey and New York
  • I-90 – Tip O’Neill Tunnel and Ted Williams Tunnel under Boston Harbor (Big Dig)
  • I-95 – Fort McHenry Tunnel in Baltimore, Maryland
  • I-264 – Elizabeth River Tunnel in Norfolk, Virginia
  • I-478 – Brooklyn Battery Tunnel under East River in New York City
  • I-495 – Lincoln Tunnel between New Jersey and New York – former route (now NJ 495/NY 495)
  • I-495 – Queens Midtown Tunnel under East River in New York City – former route (now NY 495)
  • I-664 – Monitor Merrimac Tunnel near Norfolk and Hampton Roads, Virginia
  • I-895 – Baltimore Harbor Tunnel in Baltimore, Maryland