BNSF Railway Bridge 5.1
BNSF Railway Bridge 5.1 | ||
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tracks 2 | | |
History | ||
Designer | Ralph Modjeski | |
Opened | 1908; main span replaced 1989 | |
Location | ||
The BNSF Railway Bridge 5.1,[2][4] also known as the St. Johns Railroad Bridge[2][4][5] or the Willamette River Railroad Bridge,[6] is a through truss railway bridge with a vertical lift that spans the Willamette River in Portland, Oregon, United States. Built by the Spokane, Portland and Seattle Railway (SP&S) and completed in 1908, it was originally a swing-span bridge, and its swing-span section was the longest in the world at the time.[6][7] However, 81 years later the main span was converted from a swing-type to a vertical-lift type, in order to widen the navigation channel. The lift span is one of the highest and longest in the world.[2] The bridge consists of five sections, with the two sections closest to the bank on each side fixed.
The
History
The original, swing-span bridge was built in 1906–08 by the Spokane, Portland and Seattle Railway (SP&S), as part of construction of a new line between Vancouver, Washington and Portland. SP&S was formed jointly by the Northern Pacific Railway and Great Northern Railway,[9] originally as the Portland & Seattle Railway, to build and ultimately operate new railroad lines from Portland to Seattle and Portland to Spokane, but was renamed Spokane, Portland & Seattle Railway—in early 1908,[10] before opening any track sections—after construction of the Portland–Spokane line got under way before the Seattle line. The planned new railroad was commonly referred to as the "North Bank road"[6][9] (road being short for railroad or railroad line), or North Bank line, because the Seattle line would follow the Columbia River's north bank as far as Kelso and the Spokane line would also follow the north bank, running east from Vancouver. East from Portland, the south bank of the Columbia already had a rail line, owned by the Oregon Railroad and Navigation Company (later absorbed by Union Pacific Railroad).
Design and construction
The new Portland–Vancouver rail line also included two other major bridges, the Columbia River Railroad Bridge (now known as BNSF Railway Bridge 9.6) and the Oregon Slough Railroad Bridge. Northern Pacific hired bridge engineer Ralph Modjeski in 1905 to design all three.[2][6] Modjeski's designs called for all three to use swing spans for their opening sections. However, for the Willamette crossing, this recommendation was met with resistance by some. River boat pilots were concerned that a swing span, which requires a center pivot pier, would leave too-narrow a navigation channel for the large ships that used this section of the river.[11] At that time, Portland's Steel, Burnside, Morrison and Madison Street bridges were all swing-type, with center pivot piers seen by boat pilots as inconvenient obstacles. The Port of Portland organized a committee in January 1906 to determine the feasibility of a bascule-type draw span by inspecting existing bascule bridges in Chicago and other eastern cities.[11] Modjeski and a group of Portland engineers declared a bascule design to be impractical,[12] and the president of the Portland & Seattle Railway stated his preference for a swing draw "as being more serviceable and reliable and better adapted to the river channel."[13] After undertaking their inspection, the Port of Portland committee also concluded that a bascule design would be impractical.[14] The original recommendation for a swing span was ultimately accepted, and plans for the bridge were sent to the Secretary of War for approval in May 1906.[15]
Construction of the Willamette River bridge began in August 1906.[6] Its swing-span section was the longest in the world,[2][1][7] with a length of 521 feet (158.8 m)[1] or 524 feet (159.7 m).[6] To either side of the opening span are two 269-foot-long (82 m) fixed truss spans and one 80-foot-long (24 m) deck plate girder approach span.[1]
Overall, the construction took more than two years. Structural work was completed in July 1908,
The total weight of the swing span was around 4.6 million pounds, including 400,000 pounds for the machinery.[6] In the event of a power outage, the bridge's swing span could still be turned, using a 165-hp, four-cylinder back-up generator to power the electric motors. The drum on which the span pivoted was 42 feet (13 m) in diameter.[6]
Ownership and operation of the bridge passed to the Burlington Northern Railroad (BN) in 1970, when SP&S, Northern Pacific and other railroads merged to form BN. At the end of 1996, BN merged with the Atchison, Topeka and Santa Fe Railway (Santa Fe), becoming the Burlington Northern and Santa Fe Railway[20] (officially shortened to BNSF Railway in 2005).
Accidents
The bridge sustained heavy damage on October 29, 1978, when it was struck by a
On New Year's Eve 1983, at about 10:25 p.m., two locomotives heading a BN freight train plunged into the river through the open swing span,[25] resulting in the deaths of two crew persons.[26] It was the worst train-related accident in the bridge's history. The cause was determined to have been human error, that the train crew had passed a red signal.[27]
Rebuilding as vertical-lift bridge
The center swing span was replaced by a
In order to minimize disruption to both river traffic and rail traffic, the project was carefully coordinated to allow the change to be made over just 72 hours. This work began on August 8, 1989, with removal of the 81-year-old swing-span section,[3] and was completed on August 11.[32] The pivot pier was removed by dynamite blasting three months later,[33] after the fall fish run, and with that final step the navigation channel was widened from 230 feet (70 m) to 497 feet (151 m).[32]
The 516-foot-long (157 m) lift span is one of the longest vertical-lift spans in the world and is also the fourth-highest in the world.[4][34] When fully raised, it provides vertical clearance of 200 feet (61 m) at low water.[2][4] The new lift span weighs 7,900,000 pounds (3,600,000 kg).[3] It is made of weathering steel, which is designed to rust naturally and thus turn a reddish brown. However, the remainder of the bridge, the fixed spans dating from 1908, are painted silver. This has given the rebuilt structure two distinct colors, and the unusual combination has been called unattractive by some.[2]
Operation
The bridge carries two tracks across the Willamette River and is used by
The bridge is crossed by about 30 to 35 trains per day.[37]
See also
- List of bridges documented by the Historic American Engineering Record in Oregon
- List of crossings of the Willamette River
References
- ^ The Morning Oregonian. July 17, 1908. p. 11.
- ^ ISBN 0-9787365-1-6.
- ^ a b c d Snell, John; Smith, George Bundy (August 9, 1989). "Railroad bridge job races clock". The Oregonian. Portland, Oregon. p. 1.
- ^ a b c d e Anderson, Jennifer (October 30, 2009) [April 28, 2006]. "Stumptown Stumper". Portland Tribune. Retrieved July 28, 2011.[permanent dead link]
- ^ a b "2011 Bridge inspection list, 13th Coast Guard District" (PDF). United States Coast Guard. July 18, 2011. p. 3. Retrieved July 28, 2011.
- ^ ISBN 978-0-7385-4876-0.
- ^ a b c "New Hill bridge across the Willamette River below Portland, just completed: Longest draw-span in the world is swung for the first time". The Sunday Oregonian. July 26, 1908. Section 1, p. 11.
- ^ a b Tess, John M.; Mawson, Robert (July 29, 1995). "National Register of Historic Places Registration Form: North Bank Depot Buildings" (PDF). National Park Service. Section 8, p. 4. Retrieved July 24, 2011.
- ^ a b "Two Roads Come On North Bank: Northern Pacific and Great Northern". The Sunday Oregonian. September 17, 1905. p. 1.
- ^ "Important Articles Filed: North Bank Changes Name [from Portland & Seattle Railway Company to Spokane, Portland & Seattle Railway Company], Increases Capital and Will Extend". The Morning Oregonian. January 30, 1908. p. 11.
- ^ a b "Bascule Draw For The Bridge: That Design Is Favored by the Port of Portland for Railway Structure; Special Committee Will Go to Chicago to Inspect the [Bascule] Lift Draws in Operation in That City and Report". The Morning Oregonian. January 27, 1906. p. 10.
- ^ "Bascule Draw Impracticable: What Engineers W. B. Chase and W. C. Elliot Say of the Proposition". The Sunday Oregonian. January 28, 1906. Section 1, p. 8.
- ^ "President Levey on Bridge Draw: Bascule Type Never Tried on so Extensive a Scale as Suggested". The Morning Oregonian. January 31, 1906. p. 11.
- ^ "Bascule Bridge is Not Possible: Conclusion of Portland Committee". The Morning Oregonian. February 14, 1906. p. 1.
- ^ "Bridging the Willamette: Plans for Hill Structure Will Go to the Secretary of War". The Morning Oregonian. May 2, 1906. p. 14.
- ^ "North Bank Kept From Union Depot: Trouble With Terminal Company Necessitates Another Station for New Road". The Sunday Oregonian. October 11, 1908. Section 4, p. 10.
- ^ "First Train Crosses Bridges". The Morning Oregonian. October 24, 1908. p. 4.
- ^ "Begin New Service: North Bank Road Schedule to Go Into Effect Tuesday". The Morning Oregonian. November 11, 1908. p. 16.
- ^ "First Train on Hill Road: Regular Passenger Service Inaugurated From Local Terminus". The Morning Oregonian. November 18, 1908. p. 11.
- from the original on February 14, 2017.
- ^ a b "Ship hits span; river traffic limited". The Sunday Oregonian. October 29, 1978. p. 1.
- ^ Mosey, Ed (October 30, 1978). "Ships easing past damaged bridge". The Oregonian. p. 1.
- ^ a b "Bridge suit settled". The Oregonian. November 6, 1979. p. A13.
- ^ Hill, Jim (October 31, 1978). "Railroad seeks bridge damages of $3.2 million". The Oregonian. p. B1.
- ^ Snell, John (January 2, 1984). "Crew to attempt to lift locomotive, recover 2 victims". The Oregonian. p. 1.
- ^ Crick, Rolla J.; Painter, John Jr. (January 4, 1984). "Dispute festers on rail bridge safety; bodies found". The Oregonian. p. 1.
- ^ Crick, Rolla J. (May 25, 1984). "Investigation finds train ignored bridge warning". The Oregonian. p. 1.
- ^ Goranson, Eric (November 18, 1983). "Work proceeds [final design work] on BN bridge over Willamette". The Oregonian. p. D9.
- ^ Whitney, David (April 4, 1984). "Rebuilding of bridge slated: Project to create easier ship passage". The Oregonian. p. B10.
- ^ "Riedel wins $28 million rail bridge job". The Oregonian. May 22, 1987. p. C12.
- ^ Smith, Jennifer (September 8, 1988). "Bridge updating slated". The Oregonian. p. D5.
- ^ a b Hamilton, Don; Long, Jennifer (August 12, 1989). "Span open". The Oregonian. p. D1.
- ^ Snell, John; Smith, George Bundy (October 12, 1989). "Dynamite blasts away bridge pivot". The Oregonian. p. D4.
- ISBN 0-87595-211-9.
- ^ "Work Begins Soon: U.P. Will Start Building Line to [Puget] Sound in a Month". The Morning Oregonian. October 6, 1906. p. 7.
- (PDF) from the original on May 15, 2019. Retrieved May 19, 2019.
- ^ ISBN 978-0-9787365-6-9.
External links
- Media related to Burlington Northern Railroad Bridge 5.1 at Wikimedia Commons
- Historic American Engineering Record (HAER) No. OR-7, "Burlington Northern Railroad Bridge, Spanning Willamette River at River Mile 6.9, Portland, Multnomah County, OR", 101 photos, 22 data pages, 8 photo caption pages