Lansing, IA new Mississippi bridge

[triplemultiplex]

I was genuinely surprised to learn that a new bridge over the Mississippi River at Lansing, Iowa is going to be a cantilever truss bridge.

https://iowadot.gov/lansingbridge/New-Bridge-Design-Overview



I associate this style bridge with a bygone era in the mid 20th Century when steel was cheaper and function over form was the order of the day.  I am not aware of any recent bridges of this style being built.  Perhaps others are? 
All recent new bridges over the upper Mississippi have been like cable arches or cable stay spans.  Or just boring viaducts (like the recent new bridge for I-90).  So it's interesting to see them go with a 'retro' design for this minor crossing.

[Big John]

A lot of reasons that new truss bridges are rarely built is that any expansion is very difficult, and moreover so that they are fracture critical making them more susceptible to collapse.

[Rothman]

A lot of reasons that new truss bridges are rarely built is that any expansion is very difficult, and moreover so that they are fracture critical making them more susceptible to collapse.

Gussetless trusses are safer than the old trusses with gusset plates.  NYSDOT is building one starting this summer north of Syracuse -- US 11 over Oneida Lake.  State Historical Preservation Office required a truss to replace the old truss.

[froggie]

I was genuinely surprised to learn that a new bridge over the Mississippi River at Lansing, Iowa is going to be a cantilever truss bridge.

Q: Is the bridge at Lansing historic?

    A: Yes, the Iowa DOT determined the current bridge at Lansing eligible for the National Register of Historic Places in 1995. The Iowa State Historic Preservation Officer agreed and confirmed that determination in 2016. This historic designation helped drive the design of the new bridge to closely resemble the old bridge.

[TheHighwayMan3561]

A new bridge would cost far less over time than a major retrofit of the existing Black Hawk Bridge.

The "don't replace" option also wasn't feasible because the nearest adjacent crossings are 40 miles in either direction at La Crosse to the north and Prairie du Chien to the south.

[JREwing78]

A lot of reasons that new truss bridges are rarely built is that any expansion is very difficult, and moreover so that they are fracture critical making them more susceptible to collapse.

It's highly unlikely traffic on this new bridge would ever reach a point that requires widening. Lansing, IA has fewer than 1,000 residents. A Kwik Star is probably the closest to a commercial chain establishment it has. The nearest emergency room is in Waukon, IA, about 25 miles away via twisting back roads. Ditto for the nearest Dollar General. The nearest McDonalds or Culver's is 30 miles and 45 minutes away. Suffice it to say that Lansing is an isolated town.

I am disappointed that there wasn't more consideration made for pedestrians and bicyclists. The 8-foot shoulders on each side are fine, but there's no guardrail or anything else to separate vehicle traffic from pedestrians or bicyclists. At the planned posted 25 mph speed limit, maybe that's not strictly necessary.

[triplemultiplex]

At the planned posted 25 mph speed limit, maybe that's not strictly necessary.

I assume that's cuz they don't want traffic to pick up a head of steam coming into Lansing.

[Big John]

The current bridge is indefinitely closed until a thorough inspection can be done to determine its structural integrity.

[JREwing78]

The current bridge is indefinitely closed until a thorough inspection can be done to determine its structural integrity.

That's disconcerting. Construction on the new span has been underway for a few months now.

https://www.wxow.com/news/top-stories/iowa-dot-lansing-bridge-closed-due-to-slight-movement-of-the-bridge/article_305ecbfe-d42d-11ee-a93a-1b98e7d100a4.html

[Big John]

The inspection found movement in 2 piers. Stabilization efforts have begun but the bridge could be closed for up to 2 months.

[triplemultiplex]

Damn, should've started the new bridge a year earlier.

[JREwing78]

Damn, should've started the new bridge a year earlier.

I doubt it would have mattered. The piers didn't suddenly start moving until construction on the piers for the new bridge was underway.

[JREwing78]

The fix for the (old) Lansing bridge: pull out the bridge deck, replace the existing piers with new steel ones, and then put the bridge deck back.

Meanwhile, Iowa's DOT is working on a water taxi and van pool for folks who need to make the crossing.

Work underway to repair Mississippi River bridge at Lansing
https://www.radioiowa.com/2024/03/08/work-underway-to-repair-mississippi-river-bridge-at-lansing/

[SEWIGuy]

It hasn't been shared here I think, but the Black Hawk Bridge re-opened a couple of weeks ago.

[Big John]

The bridge re-closed when movement was found in a pier again.

[edwaleni]

Safety Concerns shut down bridge crossing Mississippi River into Iowa.

https://www.wpr.org/news/safety-concerns-shut-down-black-hawk-bridge-mississippi-river-iowa



A bridge crossing the Mississippi River between Wisconsin and Iowa is closed due to safety concerns.

Iowa Department of Transportation officials closed the Black Hawk Bridge late Saturday night after a monitoring system detected movement in one of the bridge's support piers.

Construction has been underway for more than a year to replace the 94-year-old bridge connecting rural southwest Wisconsin to Lansing, Iowa. It's the only river crossing in the 60-mile stretch of state Highway 35 between La Crosse and Prairie du Chien.

Clayton Burke, project manager for the Iowa DOT, said a pier on the Iowa side of the bridge, referred to as Pier 3, moved to the north about 1.5 inches and sank into the ground slightly. He said a survey of the bridge was completed on Sunday and engineers were working Monday to evaluate whether the bridge was safe for use.

Burke said bridges are designed for some movement due to changing temperatures. But other factors, like overweight vehicles, can cause a bridge to shift too much.

"We are vibrating piling (for construction of the new bridge) into the ground right next to Pier 3, so that could certainly have an influence on the structure of the bridge," he said.

Burke said the DOT also had problems with Pier 3 moving last fall when they were working on construction next to the previous pier. Work on the new bridge was halted for about a month because of the movement.

This is the second time the existing bridge has been shut down since construction started. The crossing was closed between February and April in 2024 after construction caused two piers on the Wisconsin side of the river to slide out of place. Those piers were replaced, and the Iowa DOT provided a water taxi service during the two-month outage.

Burke said it's too soon to tell how long the current closure could last, but the DOT is hoping to release an update by the end of the week. He said the safety of the structure is the agency's top concern.

"We want to assure everybody that if it does reopen, it's because it was determined to be very safe to do so," he said.

Joanne White lives in Ferryville, a Wisconsin village just south of the Black Hawk Bridge, and sits on the village's tourism council. She said people in the village frequently cross the bridge to Lansing in order to grocery shop, attend church or dine at restaurants.

After going through the two-month closure last year, White said the uncertainty around how long this closure will last is challenging.

"It's a lifeline to go over there easily, and we take it for granted that we can get there," she said. "It is frustrating, but we want it to be safe."

A prolonged closure could have an economic impact on village businesses that count on summer tourism. This season may already be impacted by the temporary closure of state Highway 35 north of Prairie du Chien due to construction, affecting travelers looking to drive Wisconsin's Great River Road.

White said members of the tourism council were already reporting a decline in visitors for the annual Rummage on the River event over the weekend.

"We still want people to come to Ferryville and to Lansing because of the beauty, and especially for the summer," she said. "So we hope (the Black Hawk Bridge) won't be closed for a terribly long time."

[The Ghostbuster]

That would be the bridge connecting STH 82 with IA 9 and IA 26: https://www.google.com/maps/@43.3660634,-91.2137157,414m/data=!3m1!1e3?entry=ttu&g_ep=EgoyMDI1MDUxNS4wIKXMDSoASAFQAw%3D%3D. Perhaps it is time to start planning to replace the existing Black Hawk Bridge with a new one.

[Big John]

That would be the bridge connecting STH 82 with IA 9 and IA 26: https://www.google.com/maps/@43.3660634,-91.2137157,414m/data=!3m1!1e3?entry=ttu&g_ep=EgoyMDI1MDUxNS4wIKXMDSoASAFQAw%3D%3D. Perhaps it is time to start planning to replace the existing Black Hawk Bridge with a new one.

The new bridge is under construction. This is the second closing because of pier impacts from the new bridge.

[The Ghostbuster]

I wasn't aware of that. Thank you.

[SEWIGuy]

That would be the bridge connecting STH 82 with IA 9 and IA 26: https://www.google.com/maps/@43.3660634,-91.2137157,414m/data=!3m1!1e3?entry=ttu&g_ep=EgoyMDI1MDUxNS4wIKXMDSoASAFQAw%3D%3D. Perhaps it is time to start planning to replace the existing Black Hawk Bridge with a new one.

The new bridge is under construction. This is the second closing because of pier impacts from the new bridge.

Here is the page on the replacement.

Quotes from the woman in the article notwithstanding, they really are lucky they are replacing this bridge at all. There just isn't much on either side of the river there, and the stretch between Prairie du Chien and La Crosse isn't that much different than the stretch between Prairie du Chien and Dubuque to the south.

[edwaleni]

[DandyDan]

That would be the bridge connecting STH 82 with IA 9 and IA 26: https://www.google.com/maps/@43.3660634,-91.2137157,414m/data=!3m1!1e3?entry=ttu&g_ep=EgoyMDI1MDUxNS4wIKXMDSoASAFQAw%3D%3D. Perhaps it is time to start planning to replace the existing Black Hawk Bridge with a new one.

The new bridge is under construction. This is the second closing because of pier impacts from the new bridge.

Here is the page on the replacement.

Quotes from the woman in the article notwithstanding, they really are lucky they are replacing this bridge at all. There just isn't much on either side of the river there, and the stretch between Prairie du Chien and La Crosse isn't that much different than the stretch between Prairie du Chien and Dubuque to the south.

I assume people who live in Lansing or Waukon use it to go to LaCrosse, but yes, I have to believe they are lucky to be getting a new bridge there.

[Fredddie]

The new bridge is going to look a lot like the old bridge, which the people of Lansing had to fight like hell for.  The DOT would rather build a simple concrete beam bridge, but it's going to be a cantilever truss bridge.

https://www.youtube.com/watch?v=ENUlD_WKYwA. Interesting watch if you have 30 minutes.

[edwaleni]

The new bridge is going to look a lot like the old bridge, which the people of Lansing had to fight like hell for.  The DOT would rather build a simple concrete beam bridge, but it's going to be a cantilever truss bridge.

https://www.youtube.com/watch?v=ENUlD_WKYwA. Interesting watch if you have 30 minutes.

Thanks for posting that, great video. Using a non-spec bridge template probably added 25% to the cost (hence to fight for it) but it was definitely worth it.

In this era of low cost, low rigor design, bridge building, its good to see that the will of the people is respected here.

DOT's hate steel trusses becuase they are expensive to maintain compared to the typical pre-cast, pre-stressed concrete designs. But they did good here.

[SEWIGuy]

The new bridge is going to look a lot like the old bridge, which the people of Lansing had to fight like hell for.  The DOT would rather build a simple concrete beam bridge, but it's going to be a cantilever truss bridge.

https://www.youtube.com/watch?v=ENUlD_WKYwA. Interesting watch if you have 30 minutes.

Thanks for posting that, great video. Using a non-spec bridge template probably added 25% to the cost (hence to fight for it) but it was definitely worth it.

In this era of low cost, low rigor design, bridge building, its good to see that the will of the people is respected here.

DOT's hate steel trusses becuase they are expensive to maintain compared to the typical pre-cast, pre-stressed concrete designs. But they did good here.

Yeah that was an interesting video. And I think DOTs have done a good job building things that are more visually appealing lately. (For example, the I-74 bridge in the Quad Cities.)  Unfortunately they decided to make the new I-80 bridge as boring as the current one.