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Posted November 22, 2017, by R.J. McKay (lokomac8 [at] gmail [dot] com)

Here's a photo I took from a train when I worked for the Alaska Railroad years ago if you can use it. A little different perspective. --RJ--

Posted August 13, 2017, by Jann Mayer (jannmayer [at] gmail [dot] com)

Also take a look at the footings - the are angled towards the center to take the compression loads from the bottom members.

Posted August 12, 2017, by Ed Hollowell (erhollowell [at] aol [dot] com)

Luke- Very interesting reading description of the bridge in your link. It seems it was built as a cantilever and converted to an arch at completion. The highest connection at the abutment was under tension supporting the cantilever until the opposite sides were ready to join. At that point the load was shifted from tension at the abutment(s) to compression at the center of the structurer making it an arch with a pin connection. Two 80 foot side spans went from being anchors for the cantilever to simple spans. 240ft. for the longest span and 400'6'' plus the two 80' side spans.

Posted August 11, 2017, by Jann Mayer (jannmayer [at] gmail [dot] com)

This bridge was still standing in late June of 2017, although part of the timber approach is collapsing. I'll post my photos of it in the near future.

Posted August 11, 2017, by Luke

Switchback Arch was the original name the railroad gave it, and the historic article explains how it functions as a 3-hinge arch: https://books.google.com/books?id=RDUxAQAAMAAJ&pg=PA218&dq=S...

Posted August 11, 2017, by Ed Hollowell (erhollowell [at] aol [dot] com)

White Pass & Yukon RR is still running during the Summer.

How is this an arch? It is a cantilever design.

The railroad refers to it as "Steel Bridge" and since they own it I expect that is the proper name.

I don't have a measurement but when built it was considered the tallest cantilever in the world according to the railroad.

Owners claim construction date of 1901.

Posted August 9, 2017, by Jeff Snedden (historiesandmysteries [at] yahoo [dot] com)

I am a historian in Beaver County, PA, where Penn Bridge Co. was located. My brother-in-law is an engineer currently doing structural work on this bridge, and he found the Penn Bridge Co. symbol on it. I didn't see Penn Bridge credited on your site, so I wanted to drop a line. Photos attached, and free to use.

Posted July 4, 2017, by Luke

The bridge still shows up in Google Earth...

Posted July 4, 2017, by John Smith (bridgehunter [dot] com [at] aol [dot] de)

bridge destroyed. Source: On Google Earth and the pictures placed there by tourists

Posted June 28, 2017, by Erik Hilsinger (erik [dot] hilsinger [at] alaska [dot] gov)

Anchor River Bridge No. 0910 was found eligible for listing on the National Register for Historic Places in 2003.

Posted February 6, 2017, by Dana and Kay Klein

Been to Alaska "Bridge" and "Road" can truly be relative terms!

Posted February 6, 2017, by Brandon Cooper

Amazing how long that temporary roadway stayed in place. I wonder if Alaska didn't care to replace this bridge, and how many Presidents that thing survived through (LBJ,Nixon,Ford,Carter,Reagan,Bush 41, Clinton,and Bush 43.) That is an amazing feat to last 8 Presidents.

Posted September 11, 2016, by Ivan Tabler (vtabler [at] hotmail [dot] com)

The present Porcupine Crossing bridge is being replaced. Completion: Summer 2017.

Posted July 6, 2016, by Erik D Hilsinger (erik [dot] hilsinger [at] alaska [dot] gov)

Same as BH 60224.

Posted March 31, 2016, by Kyle Cuzzort (kyle [at] cuzzort [dot] org)

This bridge used to cross the Mendenhall River in Juneau; it was known as the Brotherhood Bridge. When it was replaced there in the early 1960s it was moved to Haines.

Posted February 12, 2016, by George Peterson (Glpskibum [at] gmail [dot] com)

I hauled the parts for the Kuzitrin bridge from Nome to the river in the summer of 1960. I did the survey for the abutments. They started putting up the bridge but a Crain collapsed with one of the truss sections and put the work on hold. I did the inspection on the batter pile driving. Hit blue ice and curled up the H-beams. Put Pointed shoes on the beams and drove them into the ice. Summer of 1961 we bathed and did our laundry by jumping into the 38 degree water and then swimming fast to shore. George Peterson

Posted September 11, 2015, by Dave King (DKinghawkfan [at] hotmail [dot] com)

Just heard that a local superstition is to stop before crossing and throw 3 rocks off the bridge and make 3 wishes. They do this both ways, on the way out and in the way back.

Posted August 4, 2015, by Erik D Hilsinger (erik [dot] hilsinger [at] alaska [dot] gov)

Susitna, not Sustina. Love the site.

Posted February 25, 2015, by Jai B. Kim,PE (jaikim [at] bucknell [dot] edu)

There is a valid approach to preserve this important historic

bridge(REF. The Secretary of Interior's Standards with Regard to Repair, Rehabilitation, and Replacement Situations,endorsed in " FINAL REPORT A MANAGEMENT PLAN FOR HISTORIC BRIDGES IN VIRGINIA".

The approach -Rehabilitate the bridge to carry an HS 20 (36 tons) economically and as quickly as possible.

Posted April 5, 2014, by Tom Hoffman (tehoffm [at] hotmail [dot] com)

One of these massive and older Pennsylvania through trusses exists in Alaska. Look how tall the trusses are. These kinds of bridges are becoming extremely rare and every last one should be preserved.

Posted March 13, 2014, by Nathan Holth (form3 [at] historicbridges [dot] org)

Nobody has noted how significant this bridge is so I added a statement of significance. At 700 feet its one of the longest simple truss spans around.

Posted August 22, 2012, by K. A. Erickson

In going through the doomed bridges listed I came across an article about the loss of this bridge last year. Alaska DOT threw a party topped off by blowing up this bridge to smithereens.

http://www.dot.state.ak.us/comm/pressbox/arch_2011/PR11-2512...

Posted November 5, 2011, by Craig Philpott (cphilpott [at] puc [dot] edu)

What an interesting design. It must have been a fun search to find these pictures.

Posted September 27, 2011, by Tony Dillon (spansaver [at] hotmail [dot] com)

A bridge in Nenana... over the Tanana... makes me want a Banana... ;-P

Posted March 27, 2011, by Craig Philpott (cphilpott [at] puc [dot] edu)

It is good to see a photo posted from Alaska. We need more Alaska photo's. If I could take up a collection I would be willing to go to AK on a bridgehunting trip!

Posted January 27, 2011, by Jim (lueken [at] bellsouth [dot] net)

Go to following link for the contractors very interesting report on Phase 1 repairs. Include lifting Span #4, replacing one pier and strengthening existing piers. Phase 2, not yet put out to bid involves seismic devices for all old spans...but may not ever happen.

http://mceer.buffalo.edu/research/HighwayPrj/Workshops/Truss...

Posted December 10, 2010, by Matthew Lohry (matthewlohry [at] yahoo [dot] com)

I fully agree; this is one of the most incredible truss bridges I've ever seen--maybe some verification, but from the Street view, the larger span actually looks like a subdivided Warren through truss rather than a Pennsylvania--you can trace the main diagonals, top to bottom, all the way across, typical of a Warren configuration. Anyone else have any input?

Posted December 10, 2010, by Nathan Holth (form3 [at] historicbridges [dot] org)

That makes sense. The NBI 1957 date is undoubtedly the relocation date. The bridge did look a lot older than a 1957 bridge. This is one of the finest historic bridges in Alaska. Photos of this bridge would be much appreciated.

Posted December 10, 2010, by Craig Philpott (cphilpott [at] puc [dot] edu)

Chuck, if you are in a position to submit more historical details on this bridge and/or take pictures, it sure would be a great addition to this listing.

Posted December 9, 2010, by chuck (cmoore819 [at] cfl [dot] rr [dot] com)

I believe this bridge was put across Birch Creek circa 1928. It was dismantled from some other location in Alaska and reassembled at current location.

Posted November 22, 2010, by Danny

The realinement of the bridge is suppose to be the next phase of the project. If you could look down station you would be able see that pier 2 and pier 3 was shifted,(tilted,) at the same time that pier 4 failed. In order to realine the superstructure, there will have to be some rework of those piers,(substructure,) The orignal concrete piers do not have any rebar in them and the cold joints could shift with a good earthquake like pier did.

Posted August 2, 2010, by Nathan Holth (form3 [at] historicbridges [dot] org)

This bridge was hit by a truck and closed for repairs as a result. I only found one photos of the bridge on the DOT website, but from this one photo I see rivets and v-lacing. Thus, the 1981 construction date appears to be incorrect. I wonder if the other 1980s truss listed in the NBI is also older.

Posted July 6, 2010, by Todd D Walker (mrwalk [at] aol [dot] com)

I hear you Nathan... If one historic bridge can be saved, so can others. Missouri and Pensylvania are wrecking historic bridges, Alaska shouldn't follow their trend. It is always apalling to see UCEB's being put up beside a beautiful and savable truss. The "kaboom" will surely sting, and out of the dust remains the concrete "thing"...

Posted July 6, 2010, by Nathan Holth (form3 [at] historicbridges [dot] org)

Absolutely pathetic. Nobody can try to tell me this historic bridge is in the way of anything. Don't demolish it... leave it standing next to its replacement as an abandoned historic landmark! It is so simple.

The largest and least populated state in the United States of America, and even here we can't leave the historic bridge standing next to its replacement?! What harm could it possible cause to leave it? Worst thing that could happen is an earthquake splits it in half, and that didn't stop the Million Dollar Bridge.

Posted May 4, 2010, by Anonymous

Somebody said something about the bridge being misaligned after being re-set. I wonder if the Earth Quake caused it to be off-set and so it wasn't possible to re-set it straight. Maybe all of the piers on one side are offset.

Posted February 16, 2010, by Ed Hollowell (erhollowell [at] aol [dot] com)

It was built as a part of the railroad to service the Kennecot copper mine. After the mine closed it became a road to access the Copper River Valley. Not a lot of development there but without the bridge and road it would be even less.

Actually there are large coal deposits in the area and the railroad was built with their development in mind as much as the copper mine but Theodore Roosevelt got into a fight with Morgan and the Guggenhimes who bought leases on the coal mining rights and the whole deal was killed. Depending on how you look on it it was a win for conservation or a loss for Alaska's right to develop the resources of their own state. It's a battle that continues today..

The plan was to build copper smelting plants to use the ore and coal and export copper. As it ended up only high grade copper ore concentrate was mined and shipped to Oregon for smelting. When the very high grade ore was done in the 1930's it closed. There is a lot of good ore remaining but it would have to be smelted in place and that is not going to happen under current conditions.

Posted January 24, 2010, by Nathan Holth (form3 [at] historicbridges [dot] org)

Did anyone notice that when they lifted the span back up they had a little trouble with alignment? http://www.flickr.com/photos/giantginkgo/247997934/

Posted July 19, 2009, by Anonymous

Where does this bridge go to?

Posted June 25, 2009, by Don

fourth span collapsed in earthquake on March 27, 1964, collapsed span repaired 2005.

So that means they were driving on that makeshift roadway for 41 years!

Posted March 23, 2008, by Alaska Dude

Yes, there is a photo.

I did not take it, but because it is copyrighted, I can't download it to put it on here.

But here is the link to a picture of it with the span repaired.

http://www.flickr.com/photos/11581087@N08/1438579129/

Posted March 23, 2008, by Anonymous

Does anyone have any pictures of the bridge set back on the pier?

Posted March 22, 2008, by Alaska Dude

The span the collapsed has been reset, and lifted back on the pier, and is reopen to all traffic.

Posted August 20, 2007, by Marc Okuley (marc [dot] okuley [at] alaska [dot] gov)

Images taken 8-19-07. A true bridge to nowhere. The 86 mile Nome-Taylor gravel highway ends at this one-lane bridge spanning the Kougarok River. A trail proceeds from their to the mining area at Taylor, Alaska. The road was never finished. Weight Limit is 10 tons. Bridge was reassembled at it's present site. Origin of bridge unknown.

Posted October 19, 2006, by Anonymous

This is absolutely incredible. The bridge is collapsed from an Earthquake but it is still open to traffic. I had to do a double-take on that. I guess they still have the pioneer spirit in Alaska.....or at least did in 1964.

Posted October 19, 2006, by Anonymous

This is absolutely incredible. The bridge is collapsed from an Earthquake but it is still open to traffic. I had to do a double-take on that. I guess they still have the pioneer spirit in Alaska.....or at least did in 1964.