Longest tunnel
The current longest tunnel record is 85.1 miles, held by Delaware Aqueduct, set on January 1, 1945. Last checked October 14, 2026.
85.1
miles
Delaware Aqueduct
- Holder
- Delaware Aqueduct
- Record
- 85.1 miles
- Metric
- 137 km
- Exact figure
- 137 km (85 mi)
- Location
- New York State, USA
- Date set
- January 1, 1945
- Last checked
- October 14, 2026
Sources
- Wikipedia Read the source
- nyc.gov Mayor adams launches final phase historic project secure future new york city s water
- britannica.com Read the source
- worldatlas.com The longest tunnels in the united states
Spotted an error or a newer record? Use the form below with a source link.
Spotted something out of date?
Know a different record we're missing? Tip us off
Get an email when records fall
Every Monday: the world records that were broken or newly set that week. Unsubscribe any time.
More tunnels, dams and roads records
-
Tunnels, Dams and Roads 9,010 miles Longest national highway Highway 1, Australia · Australia See record ↗ -
Tunnels, Dams and Roads 1,104 miles Longest canal Grand Canal of China · Beijing to Hangzhou, China See record ↗ -
Tunnels, Dams and Roads 565 miles Longest metro system Beijing Subway · Beijing, China See record ↗ -
Tunnels, Dams and Roads 29,826 miles Longest high-speed rail network China high-speed rail · China See record ↗