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BNSF Burlington, Iowa, bridge work shifts navigation span

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After a month-long delay, work is under way again to replace a portion of the BNSF bridge over the Mississippi River at Burlington. Iowa, only now the project will be shifted 75 feet east. After discovering debris on the riverbed that prevented the contractor from drilling a foundation for a new pier, construction was halted while the U.S. Coast Guard reassessed relocating the navigation channel, The Hawk Eye reports.

"I think overall the
project is on the right time frame, because the piers should be easy to build
now that we found a good foundation," said Roger Wiebusch, bridge
administrator for the 8th Coast Guard District in St. Louis.

Wiebusch said outside of
the shift, the project’s scope remains the same.

The project, estimated to
cost $56 million, will move the navigation channel from a pair of 150-foot
passages for barges to a single 307.5-foot passageway by changing a pivoting
swing span to a wider vertical-lift span. Work will be limited to the swing span
area, though a project to update the rest of the bridge is in the works.

Wiebusch was unsure
whether the setback would affect the project’s cost.

"The same (two)
piers are going to be built, so there may be some extra work, but then there’s
some other stuff that might have to be done," Wiebusch said. "I don’t
have the exact figures as far as how it all plays out as far as the pluses and
the minuses."

Wiebusch said because of
the shift, one additional pier will have to be removed, but he said that work
and that of constructing the new piers would not impact either navigation or
rail traffic until some time late this summer.

"The work is going
to be conducted such that the new … channel pier on the east side will be
built outside the navigation channel, so for the majority of the season this
summer, the bridge will operate normally," Wiebusch said.

The debris was discovered
early enough in the project that neither of the new piers had been constructed.

Wiebusch said once
construction on the west pier starts, barges for the contractors and their
equipment will block half of the channel, essentially making it a one-lane road
for river traffic.

The railroad bridge
project is a joint effort between BNSF and the U.S. Coast Guard as part of the
1940 Truman Hobbs Act that requires bridges to be altered if they impair the
ability to navigate the river channel. The railway hired Minnesota-based Ames
Construction as the main contractor, but the business has employed several
local subcontractors.

BNSF spokesman Steve
Forsberg said drilling for the new foundations was scheduled to be completed
last month. But that was before the obstructions were discovered.

Wiebusch said the time
should be able to be made up so that the project ultimately will be completed
on time. The project is expected to continue into 2011.

The project long has been
on the Coast Guard’s to-do list. Between 1992 and 2001, the bridge was struck
92 times, making it one of three most-hit bridges in the country. Congress
slowly has been building up appropriations for the 118-year-old bridge.
Stimulus money helped get the project started.

According to the BNSF,
roughly 30 trains cross the bridge daily. The bridge opens about 300 times a
month during the navigation season to let river traffic pass.

The railroad is using the
opportunity to overhaul the rest of the bridge.

"The way I
characterize it, our engineering team might be out a little ahead of our
finance team," BNSF assistant vice president Paul Nowicki said previously.
"One group of the company is ready to go, and the other part is looking
for the funding."

To complete that $120-million
project, BNSF and Iowa applied for a Transportation Investment Generating
Economic Recovery, or Tiger, grant. The U.S. Department of Transportation
announced those recipients Wednesday, but the bridge project was not included
on the short list.

Still, the railway staff
is not deterred.

"BNSF greatly
appreciates the consideration given to the public benefits that would have been
provided by this project and for the strong leadership demonstrated by all of
the public officials, business and community leaders in the state who supported
the Tiger application," Forsberg wrote in an e-mail. "We’re now
looking at our options in terms of the fixed spans."

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