title: List of tunnels documented by the Historic American Engineering Record in Oregon
text: # List of tunnels documented by the Historic American Engineering Record in Oregon
  
  This is a list of tunnels documented by the Historic American Engineering Record in the US state of Oregon.
  
  ## Tunnels
  
  | Survey No. | Name (as assigned by HAER) | Built | Documented | Carries | Crosses | Location | County | Coordinates |
  | - | - | - | - | - | - | - | - | - |
  | OR-3 | Portland and Southwestern Railroad Tunnel | 1910 | 1982 | Portland and Southwestern Railroad | Nehalem Divide | Chapman | Columbia | 45°49′56″N 123°03′02″W﻿ / ﻿45.83222°N 123.05056°W﻿ / 45.83222; -123.05056﻿ (Portland and Southwestern Railroad Tunnel) |
  | OR-36-L | Historic Columbia River Highway, Oneonta Tunnel | 1914 | 1995 | Historic Columbia River Highway | Oneonta Point | Troutdale | Multnomah | 45°35′23″N 122°04′29″W﻿ / ﻿45.58972°N 122.07472°W﻿ / 45.58972; -122.07472﻿ (Historic Columbia River Highway, Oneonta Tunnel) |
  | OR-36-O | Historic Columbia River Highway, Toothrock Tunnel | 1932 | 1995 | Historic Columbia River Highway | Toothrock | Troutdale | Multnomah | 45°38′18″N 121°56′09″W﻿ / ﻿45.63833°N 121.93583°W﻿ / 45.63833; -121.93583﻿ (Historic Columbia River Highway, Toothrock Tunnel) |
  | OR-36-R | Historic Columbia River Highway, Mitchell Point Tunnel and Viaduct | 1915 | 1995 | Historic Columbia River Highway | Lower Mitchell Point | Troutdale | Multnomah | 45°42′15″N 121°37′01″W﻿ / ﻿45.70417°N 121.61694°W﻿ / 45.70417; -121.61694﻿ (Historic Columbia River Highway, Mitchell Point Tunnel and Viaduct) |
  | OR-36-T | Historic Columbia River Highway, Mosier Twin Tunnels | 1920 | 1995 | Historic Columbia River Highway | Unnamed point | Troutdale | Multnomah | 45°41′06″N 121°25′18″W﻿ / ﻿45.68500°N 121.42167°W﻿ / 45.68500; -121.42167﻿ (Historic Columbia River Highway, Mosier Twin Tunnels) |
  | OR-92 | Southern Pacific Railroad Natron Cutoff, Tunnel 3 | 1925 | 1997 | Southern Pacific Railroad, Cascade Subdivision | Pengra Pass | Odell Lake | Klamath | 43°35′21″N 122°03′07″W﻿ / ﻿43.58917°N 122.05194°W﻿ / 43.58917; -122.05194﻿ (Southern Pacific Railroad Natron Cutoff, Tunnel 3) |
  | OR-93 | Southern Pacific Railroad Natron Cutoff, Tunnel 5 | 1927 | 1997 | Southern Pacific Railroad, Cascade Subdivision | Unnamed point | McCredie Springs | Lane | 43°37′18″N 122°09′23″W﻿ / ﻿43.62167°N 122.15639°W﻿ / 43.62167; -122.15639﻿ (Southern Pacific Railroad Natron Cutoff, Tunnel 5) |
  | OR-94 | Southern Pacific Railroad Natron Cutoff, Tunnel 22 | 1910 | 1997 | Southern Pacific Railroad, Cascade Subdivision | Unnamed ridge | Oakridge | Lane | 43°44′59″N 122°29′04″W﻿ / ﻿43.74972°N 122.48444°W﻿ / 43.74972; -122.48444﻿ (Southern Pacific Railroad Natron Cutoff, Tunnel 22) |
  | OR-95 | Southern Pacific Railroad Natron Cutoff, Tunnel 23 | 1910 | 1997 | Southern Pacific Railroad, Cascade Subdivision | Unnamed point | Westfir | Lane | 43°47′36″N 122°32′46″W﻿ / ﻿43.79333°N 122.54611°W﻿ / 43.79333; -122.54611﻿ (Southern Pacific Railroad Natron Cutoff, Tunnel 23) |
  