Rating:
7 votes

Harmon Tunnel

Photos 

Photo taken by Zach Diehn

View this photo on Flickr

BH Photo #246110

Map 

Street View 

Facts 

Overview
Tunnel under backbone ridge on Pammel Park Rd
Location
Madison County, Iowa
Status
Open to traffic
History
Originally bored to carry a flume 1858, Widened for road use 1925; Rehabilitated 1982
Builder
- William Harmon & Sons (Original 1858 Flume Bore)
Design
Tunnel
Dimensions
Span length: 149.9 ft.
Total length: 149.9 ft.
Deck width: 20.7 ft.
Recognition
Eligible for the National Register of Historic Places
Approximate latitude, longitude
+41.29613, -94.07348   (decimal degrees)
41°17'46" N, 94°04'25" W   (degrees°minutes'seconds")
Approximate UTM coordinates
15/410123/4572187 (zone/easting/northing)
Quadrangle map:
Winterset
Inventory numbers
IA 699140 (Iowa bridge number)
BH 48113 (Bridgehunter.com ID)
Inspection (as of 11/2010)
Appraisal: Functionally obsolete
Sufficiency rating: 76.0 (out of 100)

Update Log 

  • December 19, 2016: Updated by Luke: Refined history
  • August 27, 2014: New photos from Lee Smith
  • January 28, 2014: New Street View added by Luke Harden
  • July 17, 2013: Photo imported by Luke Harden
  • January 2, 2013: Photo imported by Luke Harden
  • August 22, 2011: New photo from Luke Harden
  • February 13, 2011: Added by J.P.

Sources