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Hamden Covered Bridge 32-13-03 #2

Photos 

Photo taken by Brian McKee in May 2010

Enlarge

BH Photo #170673

Map 

Street View 

2001 Reconstruction 

Written by Fmiser

I encountered a website covering the 2001 rehabilitation of this bridge from an engineering perspective. I found it a rather fasinating insite to the details of a wooden truss bridge. It inspired me to dig a bit deeper into it's history, in particular the changes to the structure over time.

Mid-span bent

In the 1940s, after being in service for more than 80 years, the Long trusses were sagging enough a center bent was added. This would explain the listing of 60ft for the longest span here on Bridgehunter.com. The rehabilitation eliminated the need for this bent, so it was removed so the bridge is again a single span.

External Buttress

The bridge was worked on again in 1966. This time, two external butresses were added to each side to correct lean and windows were added so people would no longer knock out siding boards so they could fish from the bridge. The 2001 rehabilitation removed the external buttresses but kept the windows.

Reconstruction alterations

The original bottom chord was multiple pieces connected with a bolt-of-lighting splice. The replacement bottom chord is a single piece glue-laminated beam.

Some of the vertical post showed evidence of over-stress. These were replaced with heavier timbers. Some of the existing timbers were move to allow reusing them.

An aspect of Colonel Long's patent is provision of wedges at the connection between vertical post and chord. Originally, there were wedges only at the bottom chord. After stress analysis, it was decided to add wedges to the top chord as well.

The pitch of the roof was increased to allow a more substantial internal bracing while maintaining traffic overhead clearance.

Links

http://www.hamdenny.com/attractions.html
http://www.vermontbridges.com/hamden.announce.htm
https://en.wikipedia.org/wiki/Hamden_Bridge

Facts 

Overview
Covered bridge over West Branch Delaware River on Basin Clove Road
Location
Delaware County, New York
Status
Open to traffic
History
Built 1859 by Robert Murray, rehabilitated in 2001
Design
Covered Long through truss
Dimensions
Span length: 130.9 ft.
Total length: 130.9 ft.
Deck width: 12.8 ft.
Vertical clearance above deck: 9.0 ft.
Recognition
Posted to the National Register of Historic Places on April 29, 1999
Approximate latitude, longitude
+42.19556, -74.98806   (decimal degrees)
42°11'44" N, 74°59'17" W   (degrees°minutes'seconds")
Approximate UTM coordinates
18/500986/4671489 (zone/easting/northing)
Quadrangle map:
Hamden
Inventory numbers
NY 3352500 (New York State bridge identification number)
NRHP 99000502 (National Register of Historic Places reference number)
WGCB 32-13-03 (World Guide to Covered Bridges number)
BH 25925 (Bridgehunter.com ID)
Inspection (as of 07/2015)
Deck condition rating: Excellent (9 out of 9)
Superstructure condition rating: Good (7 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Appraisal: Functionally obsolete
Sufficiency rating: 19.4 (out of 100)
Average daily traffic (as of 2009)
208

Categories 

19th Century (6,182)
Built 1859 (17)
Built during 1850s (339)
Covered (1,353)
Delaware County, New York (57)
Functionally obsolete (7,988)
Have street view (22,078)
Long truss (28)
Modern (1,667)
NR-listed (2,844)
New York (3,177)
One-lane traffic (7,423)
Open (36,573)
Owned by county (18,854)
Span length 125-175 feet (3,770)
Through truss (12,899)
Total length 125-175 feet (5,239)
Truss (29,446)
Wooden deck (5,864)

Update Log 

  • July 28, 2016: New Street View added by Dana and Kay Klein
  • June 7, 2012: Essay added by Fmiser
  • June 6, 2012: Updated by Fmiser: Change the work done in 2001 from "replaced" to "rehabilitated".
  • January 24, 2011: New photo from Fmiser
  • July 26, 2010: New photos from Brian McKee

Sources 

Comments 

Basin Clove Road Bridge
Posted May 5, 2007, by Trish Kane (bobtrish68 [at] frontiernet [dot] net)

This single span, Long truss bridge is also known as the Hamden Covered Bridge. It was built in 1859 by Robert Murray and measures 128 feet. It was listed on the State and National Register of Historic Places on April 29, 1999. The World Guide to Covered Bridges has assigned the following number to this bridge: NY 32-13-03. Photos submitted by Bob and Trish Kane, Sherburne, NY.