10 Longest Tunnel in the United States 2025

10. Lincoln Tunnel (New York/New Jersey): A 1.5-mile tunnel with three tubes connecting Midtown Manhattan to Weehawken, New Jersey.

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9. Holland Tunnel (New York/New Jersey): A 1.6-mile tunnel connecting Manhattan to Jersey City under the Hudson River.

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8. Ted Williams Tunnel (Massachusetts): A 1.6-mile tunnel under Boston Harbor, part of the I-90 highway.

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7. Eisenhower–Edwin C. Johnson Memorial Tunnel (Colorado): A 1.7-mile tunnel carrying Interstate 70 through the Rocky Mountains.

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6. Snoqualmie Tunnel (Washington): A 2.25-mile tunnel now used for hiking and cycling on the Palouse to Cascades State Park Trail.

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5. Anton Anderson Memorial Tunnel (Alaska): At 2.5 miles, it’s the longest combined rail and highway tunnel in North America.

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4. Cascade Tunnel (Washington): A 7.8-mile railroad tunnel passing through the Cascade Range.

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3. Hultman Aqueduct (Massachusetts): Spanning 18 miles, this tunnel serves the Boston metropolitan area's water needs.

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2. Quabbin Aqueduct (Massachusetts): A 25-mile tunnel transporting water from the Quabbin Reservoir to Boston.

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1. Delaware Aqueduct (New York): The world's longest tunnel at 85 miles, carrying water to New York City.

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