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Manning bridge on the Salmon

Manning bridge on the Salmon

Postby lovetheedge » Thu Oct 12, 2017 8:58 am

Following is an article from today's Star News a local newspaper on the Manning bridge.


LEAD STORY—THURSDAY, OCTOBER 12, 2017
Across The Crevice

New Salmon River Bridge will support recreation, forest projects

BY PHIL JANQUARTfor The Star-News
It comes at a cost of over $9.6 million, but when the Manning Crevice Bridge replacement is complete, it will support a growing recreation economy and open up new access for logging trucks.

The current Manning Crevice bridge was built in 1934 and has deteriorated past the point of maintenance. ABOVE: Project Manager Connor Edlund inspects support cables that are drilled 125 feet into rock.
The steel and concrete suspension bridge, funded with federal highway dollars, is being erected over the Salmon River 14 miles east of Riggins.
It will replace the current wooden bridge built in 1934 by the Civilian Conservation Corps that was built as part of an ambitious plan to build a road all the way to Salmon.

The project was abandoned at the onset of World War II and the stretch of Salmon River where the road would have gone is now protected under the federal 1968 Wild and Scenic Rivers Act.

But the current bridge has an important role in supporting outfitters, guides and others using the river for rafting, kayaking, hunting and fishing. That role will be assumed by the new bridge, which is scheduled to be opened next spring.

“We are talking about a major economic interest for Riggins,” Payette National Forest Public Affairs Officer Brian Harris said. “The river corridor is really the major basis of their economy.”

The current bridge does not meet standards for loaded logging trucks and for road maintenance equipment firefighting vehicles, Harris said.

The existing structure is only rated for about 36,000 pounds, which makes it impossible for some heavy equipment to cross, he said. By comparison, a fully loaded semi-trailer weighs 80,000 pounds.

Hairpin Turns

There are also hairpin turns on both sides of the current bridge that prevent some vehicles from crossing, Harris said.

With the current bridge, larger jet boat trailers have to be winched into alignment with the bridge in order to cross.

The project is funded by the Western Federal Lands Highway Division of the U.S. Department of Transportation. The agency awarded the contract to Record Steel and Construction, Inc. of Boise, which began work last year.

The most striking feature is the 75-foot tower that will help stabilize thousands of pounds of cable that span 300 feet across the river and are anchored 125 feet into the mountainside.

Each cable is 3-1/2 inches thick and weighs eight tons, said Connor Edlund of
RSCI Inc.

“The cool thing about this bridge is that it will be able to handle any legal load, up to a nine-axle truck with an excavator on it,” Edlund said.

So far, 1,800 tons of concrete have been poured, with more to come, specifically for sections that will make up the bridge’s driving surface.

“The deck is really the last big placement,” Edlund said. “The concrete is a unique type of concrete. It’s lightweight, specialty concrete that’s used on projects specific to bridge decks.”

Concrete pumping equipment could not cross the old bridge, forcing the use of special equipment to pump concrete over the river.

A crane had to be brought over French Creek Road from the south so it could be used on the south side of the river.

“They brought it all the way up from McCall,” Edlund said. “They brought it down the French Creek grade. Those roads up there are very tight.”

The new bridge is an impressive piece of engineering, but Harris, a native of the area, said he will hate to see history disappear when the current bridge is removed.

“From a historical aspect, it’s unfortunate that it doesn’t meet current standards,” he said. “For many people it is an icon of the river.”

The wooden bridge is named after CCC worker John C. Manning, who was killed during its construction. The Manning name will be retained on the new bridge.

RSCI is negotiating with federal officials to give the north tower of the existing bridge to the city of Riggins to be converted into a monument, Edlund said.




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Re: Manning bridge on the Salmon

Postby smitty » Thu Oct 12, 2017 12:49 pm

Interesting read, Dennis!! Thanks for sharing.
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Re: Manning bridge on the Salmon

Postby Upacreek » Thu Oct 12, 2017 6:44 pm

It's been fun to watch the progress.
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Re: Manning bridge on the Salmon

Postby waylon » Thu Oct 12, 2017 8:38 pm

drove across it this summer, some ballsey studs to get that crane truck across that old wooden bridge. :Drink:
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Re: Manning bridge on the Salmon

Postby Eagle1 » Thu Oct 12, 2017 8:59 pm

They brought that crane in from up river over a very steep road from McCall. Road is straight up coming down French creek.

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Re: Manning bridge on the Salmon

Postby waylon » Fri Oct 13, 2017 11:03 pm

ok that's make sense.
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