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| New Chain of Rocks Bridge | |
|---|---|
| Name | New Chain of Rocks Bridge |
| Caption | The New Chain of Rocks Bridge spanning the Mississippi River |
| Carries | Interstate 270 traffic, pedestrians (limited) |
| Crosses | Mississippi River |
| Locale | Granite City, Illinois — St. Louis, Missouri |
| Maint | Illinois Department of Transportation and Missouri Department of Transportation |
| Design | Cantilever truss / continuous steel girder |
| Opened | 1966 |
New Chain of Rocks Bridge is a major Mississippi River crossing connecting the Metro-East area of Illinois with the St. Louis metropolitan area of Missouri. Opened in 1966 to supplement the original Chain of Rocks Bridge, it forms a key segment of Interstate 270 and links suburban corridors such as Granite City, Illinois and Hamel, Illinois with riverfront communities including Venice, Illinois and Madison County, Illinois. The structure has played a role in regional freight routing, commuter flows, and recreational access near landmarks such as Eads Bridge, Gateway Arch National Park, and the Chain of Rocks Canal.
The bridge was conceived amid mid-20th century interstate expansion influenced by the Federal-Aid Highway Act of 1956, the growth of Interstate Highway System, and postwar suburbanization patterns tied to St. Louis. Early planning involved coordination among Illinois Department of Transportation, Missouri Department of Transportation, the United States Army Corps of Engineers, and regional planners from the East-West Gateway Council of Governments. Construction began in the early 1960s as traffic volumes on crossings like the MacArthur Bridge (St. Louis) and the Poplar Street Bridge increased, and after feasibility studies referencing the original Chain of Rocks Bridge recommended a higher-capacity crossing. The bridge opened to vehicular traffic in 1966, coinciding with expansions along Interstate 70, Interstate 55, and Interstate 44 corridors that shape freight and passenger movements in the Midwest.
Design work engaged engineering firms and contractors familiar with large river crossings similar to Eads Bridge and the Hercules Bridge (Cleveland) era practices. The bridge uses a mix of cantilever truss spans and continuous steel girder sections, a structural approach seen in crossings like the Astoria–Megler Bridge and the Tacoma Narrows Bridge (1950), optimized for the wide channel and navigational clearances of the Mississippi River. Construction required coordination with the United States Coast Guard for navigational safety, permitting by the United States Army Corps of Engineers, and materials procurement involving steel producers such as U.S. Steel and suppliers associated with the American Institute of Steel Construction. Foundations were sunk near the riverbed, with cofferdam and pile-driving operations similar to methods used on the Golden Gate Bridge and the Sydney Harbour Bridge.
Since opening, the bridge has carried segments of I‑270 serving commuter traffic between Granite City, Illinois, Maryland Heights, Missouri, and Collinsville, Illinois, as well as truck flows connecting Interstate 55, Interstate 64, and Interstate 70. It interfaces with regional highways such as U.S. Route 67, Illinois Route 3, and county routes in Madison County, Illinois. Transit planners from the East-West Gateway Council of Governments and freight analysts at the Federal Highway Administration have documented its role in diverting through traffic from downtown crossings like the Eads Bridge and the Poplar Street Bridge. The bridge has also been incorporated into emergency routing plans coordinated with the St. Louis Metropolitan Police Department and regional emergency management agencies.
Primary materials include structural steel, concrete substructure elements, and corrosion protection systems developed with standards from the American Society of Civil Engineers and the American Institute of Steel Construction. The superstructure features welded and riveted connections, expansion joints, and bearings similar to those specified in manuals from the National Highway Institute and construction precedents like the Mackinac Bridge. Deck systems accommodate multi-lane vehicular carriageways with parapets, lighting, and drainage designed per specifications from the Federal Highway Administration. The piers and abutments rest on deep foundations influenced by geotechnical reports produced by firms using methods from the American Geotechnical Society.
Over its service life, the bridge has undergone inspections under the National Bridge Inspection Standards and periodic maintenance funded through state and federal programs such as the Highway Trust Fund. Notable events include deck resurfacing projects, bearing replacements, and structural steel rehabilitation prompted by fatigue identified in routine inspections, paralleling repair techniques used on structures like the I-35W Mississippi River bridge (Minneapolis) after that collapse prompted stringent inspections nationwide. Maritime incidents and ice flows on the Mississippi River have necessitated pier protection upgrades coordinated with the United States Coast Guard and the United States Army Corps of Engineers. Rehabilitation contracts have been awarded to regional construction firms and specialty fabricators certified under National Institute of Standards and Technology guidelines.
The bridge functions as both a transportation artery and a marker in the St. Louis region’s infrastructure narrative alongside historic crossings including the Eads Bridge and the Chain of Rocks Bridge (old). It contributes to commuter patterns that influence employment centers such as St. Louis Lambert International Airport, Downtown St. Louis, and industrial zones in Madison County, Illinois. The crossing figures in planning studies by the Metropolitan Transportation Commission and regional conservation discussions involving Missouri Department of Natural Resources and Illinois Department of Natural Resources when balancing transportation needs with recreational use of nearby sites like the Chouteau Island and the Chain of Rocks Canal State Park. It has appeared in coverage by outlets such as the St. Louis Post-Dispatch and technical reports from the Federal Highway Administration.
The bridge’s surroundings include riverine habitats associated with the Mississippi River floodplain, neighboring communities like Granite City, Illinois and Venice, Illinois, and recreational areas including the Chain of Rocks Canal and nearby trail systems that connect to regional greenways managed by organizations such as the Great Rivers Greenway. Access roads tie into I‑270 interchanges and county networks in Madison County, Illinois and St. Louis County, Missouri, integrating with public works operations of both Illinois Department of Transportation and Missouri Department of Transportation. Environmental reviews during construction and later projects referenced protocols from the U.S. Fish and Wildlife Service and the Environmental Protection Agency to mitigate impacts on wetlands and migratory species associated with the Mississippi River corridor.
Category:Bridges in the United States Category:Bridges over the Mississippi River Category:Interstate 270 (Illinois–Missouri)