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The Interstate 74 Bridge, officially known as the Iowa-Illinois Memorial Bridge, and often called The Twin Bridges, or the I-74 Bridge, are basket-handle, through arch twin bridges that carry Interstate 74 across the Mississippi River and connect Bettendorf, Iowa, and Moline, Illinois. It is located near the geographic center of the Quad Cities.

Current bridge

Construction of the new bridge in 2019.
Construction of the nearly completed bridge in 2021.

Funding and planning

The I-74 Corridor Study was completed to study replacing the old bridge with a larger one with 4 lanes in each direction. The study claimed that the I-74 Bridge project would spur economic growth, create construction jobs, reduce traffic backups, and improve air quality. Funding for the construction of the new bridge had been earmarked for $22 million in 2017 and $50 million in 2018. Former Illinois Governor Pat Quinn said the state is committed to bridge improvements to help traffic flow and "boost economic growth in the region".

By 2012, the Illinois Department of Transportation budgeted more than $34 million for engineering, design, and land acquisition for the new bridge. The conceptual design of the arch bridge was completed by CH2M Hill and Boston-based bridge designer Miguel Rosales from Rosales + Partners. Final design was completed by Modjeski and Masters in association with Alfred Benesch & Company. The portion of the bridge spanning the Mississippi River was estimated at more than $700 million, while the project as a whole, including all approach routes and connectors, was estimated at $1.2 billion.

Opening of the current bridge and closure of the original

On November 13, 2020, the Iowa-bound side of the new bridge opened to motorists.[3] The bridge was officially dedicated on December 1, 2021. Speakers included Congresswoman Cheri Bustos, Illinois Governor J. B. Pritzker and other state and local officials from both Illinois and Iowa.[4] The second span for Illinois-bound traffic was opened the following evening.[5] The pedestrian and bike path was opened on April 27, 2022.[6] An elevator up to the walkway in Bettendorf has yet to be completed.

The new bridge is just upstream from the old bridge and is a basket-handle, through-arch twin bridge with four lanes in each direction and a pedestrian/bicycle path. A ground-breaking ceremony for the new bridge was held on June 26, 2017. The westbound bridge was expected to be completed in late 2019 and the eastbound span was expected to be completed in late 2020.[7] Winter weather conditions and the resulting high water over an extended period of time, however, created delays and the opening of the first span was pushed to the first half of 2020.

Original bridge

History

Before the first span was built, the only bridge in the Tri Cities was the Government Bridge between Rock Island, Illinois, and Davenport, Iowa.[10] William P. Bettendorf, founder of the Bettendorf Company and namesake for the city of Bettendorf, began planning a toll bridge between Bettendorf and Moline in 1907. The year before, the United States Congress passed a law allowing private citizens to build a bridge as a business venture. Bettendorf died in 1910 and the momentum to build the bridge died with him.

Funding, planning, and completion

In 1931, the city of Davenport along with a group of local businessmen formed the Davenport Bridge Commission to construct the new bridge. Moline refused to grant the franchise for the bridge and the early years of the Great Depression made it difficult for the businessmen to finance it on their own without the city's help.[10] After several setbacks because of design and location issues, construction for the first span began in 1934. It was designed by engineer Ralph Modjeski. The first span opened on November 18, 1935, as a toll bridge. Tolls were set at 15 cents for passenger vehicles and light trucks, 30 cents for heavy trucks, and 5 cents for pedestrians to use the sidewalk.

Improvements

In 1959, an identical twin span, built from the same blueprint, opened to facilitate increased traffic demands. Money from tolls paid for most of the new span.[10] The upstream span was the older of the two.[11] Tolls were discontinued in 1970. Interstate 74 was routed over the bridges in 1975, with onramps being redesigned to facilitate as such.

Problems

Built for a daily crossing of 48,000 vehicles, in its later years the daily average grew to 80,000,[2] making it by far the most traveled bridge in the Quad Cities. In 1994, the Illinois Department of Transportation had requested a study of bridges from Interstate 80 to Interstate 280 in the Quad Cities and the Bi-State Regional Commission agreed. The other two Interstate bridges were up to Interstate standards, while the Interstate 74 Bridge was functionally obsolete and was not built to Interstate standards, as both of them predated I-74's routing through the area. Each span had two narrow lanes, no shoulder, and a 50-mile-per-hour (80 km/h) speed limit. While on a tour at the base of the bridge in Bettendorf in May 2012, U.S. Transportation Secretary Ray LaHood said that, in comparison with other bridges that he has seen in other states, the I-74 Bridge is one of the worst he's seen.[12][13]

Demolition of the old spans

The contract for demolishing the old spans over the river was awarded in 2022 to the Helm Group, the company who had a part in constructing the new viaducts in downtown Bettendorf. Because it would be taken down piece-by-piece, demolition of the old bridge was not expected to be completed until circa 2024.[14] In December 2022, the United States Postal Service announced that an image of the new I-74 bridge would be one of four bridge stamps released in 2023.[15] On May 17, 2023, it was announced that the towers and cables on the Illinois-bound side of the old bridge would be demolished by using explosive charges. The demolition would take place on a Sunday morning between June or July, though the exact date was not revealed.[16]

On June 18, 2023, the trusses of the deckless Illinois bound span were detonated with explosives, leaving only a small part of the bottom superstructure to be removed in a future demolition.[17] On August 27, 2023, the Iowa bound trusses were also blasted, in addition to the implosion of the Illinois bound piers.[18] The final detonation occurred on October 15th, with the Iowa bound piers being imploded.[19]

See also

References

  1. ^ "I-74 River Bridge | About".
  2. ^ a b c https://www.helmgroup.com/documents/HelmGroup-Fall2011_CS5.pdf[permanent dead link]
  3. ^ Trix, Herb. "Half of New I-74 Bridge Ready to Open". Rock Island: WVIK. Retrieved November 12, 2020.
  4. ^ Barb Ickes (December 2, 2021). "Spanning the ages: Thousands celebrate the new I-74 bridges". Quad-City Times. Davenport. Retrieved December 3, 2021.
  5. ^ Staff report (December 3, 2021). "Illinois-bound span of I-74 bridge now open to traffic". Quad-City Times. Davenport. Retrieved December 3, 2021.
  6. ^ KWQC Staff (April 27, 2022). "I-74 bike and pedestrian paths now open". Davenport: KWQC-TV. Retrieved May 1, 2022.
  7. ^ Staff report (June 26, 2017). "I-74 bridge replacement project applauded by Q-C, state leaders". The Dispatch / The Rock Island Argus. East Moline. Retrieved October 22, 2019.
  8. ^ "I-74 River Bridge | About".
  9. ^ a b "Bridges: Iowa, Illinois order safety inspections". Quad City Times. Retrieved December 19, 2007.
  10. ^ a b c Brooklyn Draisey (December 26, 2021). "Bridging the past and future: A look at how the old and new I-74 bridges came to be". Quad-City Times. Davenport. Retrieved December 26, 2021.
  11. ^ "I-74 Bridge". bridgehunter.com. Retrieved December 3, 2021.
  12. ^ Funding Back For I-74 Bridge - KWQC-TV6 News and Weather For The Quad Cities Archived May 17, 2012, at the Wayback Machine
  13. ^ "Schilling, Loebsack Applaud the Illinois DOT's Decision to Fund I-74 Bridge | Congressman Bobby Schilling". Archived from the original on June 25, 2012. Retrieved May 27, 2012.
  14. ^ KWQC Staff (September 27, 2022). "Old I-74 bridge to be dismantled piece-by-piece". Davenport: KWQC-TV. Retrieved September 20, 2022.
  15. ^ KWQC Staff (December 20, 2022). "I-74 bridge to be stamp in 2023". Davenport: KWQC-TV. Retrieved December 20, 2022.
  16. ^ O'Neill, Michelle (May 17, 2023). "Helm to Use Explosives to Demolish Towers of Old I-74 Bridges". WVIK, Quad Cities NPR. Retrieved May 18, 2023.
  17. ^ "Demolition of Old I-74 Bridge Towers & Cables". WVIK, Quad Cities NPR. June 20, 2023. Retrieved June 26, 2023.
  18. ^ Hipskind, Jenny (August 27, 2023). "Old I-74 bridge span comes crashing and splashing down". wqad.com. Retrieved August 28, 2023.
  19. ^ Underwater implosion takes out old I-74 Bridge piers, retrieved February 8, 2024

External links

source: https://en.wikipedia.org/wiki/I-74_Bridge