The Calcasieu River Bridge
The Louisiana Memorial World War II Bridge carries I-10 over the Calcasieu River between Lake Charles and Westlake. Built in 1952, it is 74 years old. Its design life was 50 years, a threshold it passed 24 years ago. (LADOTD)
The bridge was designed for 37,000 vehicles per day. It now carries approximately 90,000, which is 2.4 times its design capacity. Speed is restricted to 50 mph due to structural concerns. (LADOTD; FHWA NBI)
Two different rating systems measure the bridge's condition, and both tell the same story. The NBI condition rating, which scores individual components on a 0-to-9 scale, stands at 3 (serious). The sufficiency rating, a separate metric that measures overall adequacy across structural, functional, and essentiality factors on a 0-to-100 scale, is 6.6 out of 100 as of 2017. That sufficiency score has declined steadily: 40.9 in 1992, 9.9 by 2010, 6.6 by 2017. (FHWA NBI 2017)
In August 2020, Hurricane Laura made landfall near Lake Charles as a Category 4 storm. The Isle of Capri riverboat casino broke from its mooring and struck the bridge piers. The bridge was temporarily closed for inspection. (LADOTD; NTSB)
That was not the only closure. In September 2021, a tractor-trailer fire shut down the eastbound span entirely. In June 2024, both eastbound lanes closed for emergency repairs. In May 2025, I-10 westbound closed and traffic was diverted to I-210. (LADOTD)
Replacement was first proposed in 1999. For more than 25 years, the project stalled through cycles of study, political disagreement, and funding shortfalls. Louisiana could not afford the project from its own budget. (LADOTD; I-10 Calcasieu Bridge Project)
The replacement is now a $2.3 billion public-private partnership, the largest infrastructure project in Louisiana history. The consortium, Calcasieu Bridge Partners (Plenary Americas, Sacyr, Acciona), reached financial close in August 2024. Construction begins March 2026, with expected completion in August 2031. The contract is a 50-year Design-Build-Finance-Operate-Maintain concession. (LADOTD)
The new bridge will span a 5.5-mile corridor with eight lanes: six travel lanes and two auxiliary. Tolling under the GeauxPass system will begin at completion, with a standard rate of $2.50 per automobile and a $0.25 local tag rate. (LADOTD)
The Calcasieu River Bridge compresses every dimension of Louisiana's bridge problem into one structure: age, overloading, hurricane exposure, repeated closures, political delay, and a P3 funding model born from the state's inability to pay for the project alone.
Statewide Snapshot
Louisiana has 12,684 bridges. Of those, 1,423 are rated in poor condition, a rate of 11%. The state ranks #7 nationally. The national average is 6.7%. (ARTBA 2025)
The inventory is unusually dense. Louisiana has 19.4 bridges per 100 road-miles, 10th nationally and well above the national average of approximately 14.7. Nearly 5,000 miles of navigable waterways cross the state, and four of the five longest bridges in the United States are in Louisiana, including the Lake Pontchartrain Causeway. (ARTBA 2025; FHWA)
The condition distribution tells a deeper story: approximately 4,919 bridges (39%) are rated good, approximately 6,321 (50%) are rated fair, and 1,423 (11%) are rated poor. Half the inventory sits in the middle category. (ARTBA 2025)
Half of Louisiana's 12,684 bridges, approximately 6,300, are currently rated "fair." Fair is the middle NBI category, sitting between good and poor. While the poor count has been improving (from approximately 1,600 to 1,423 over five years), the share rated "good" has been falling as the inventory ages. The pipeline of bridges trending toward poor is filling even as the worst bridges get fixed.
The trajectory has been positive. Around 2015, approximately 14.5% of Louisiana's bridges were rated poor. By 2025, that figure dropped to 11%, and the poor count fell from approximately 1,600 in 2020 to 1,423. Louisiana recorded the second-largest decline in poor-condition bridges nationally over that period. (ARTBA 2025)
The American Society of Civil Engineers gave Louisiana's bridges a D+ in its November 2025 report card. The state's overall infrastructure grade improved to C-, up from D+ in 2017. (ASCE 2025)
Neighboring states tell a stark story of regional contrast. Texas has a 1.2% poor rate. Arkansas sits at 5.4%. Mississippi is at 5.8%. Louisiana's 11% is nearly double Mississippi's rate and nearly 10 times Texas's. (ARTBA 2025)
LADOTD owns approximately 62% of the state's bridges, with parishes and municipalities owning the remaining 38%. Unlike many states where local owners inspect their own bridges, LADOTD inspects all bridges statewide, both state-owned and locally owned, a practice it has maintained for more than 30 years. (LADOTD)
Water, Storms, and Sinking Ground
No other state in the ARTBA top 15 for poor bridges faces the combination of environmental forces that Louisiana does. The state's bridge problem is defined by water: hurricanes from above, subsidence from below, waterways on all sides, and repetitive flooding that compounds the damage from each.
Seven Major Hurricanes in 16 Years
Between 2005 and 2021, seven major hurricanes struck Louisiana and damaged bridge infrastructure across the state. Each storm imposed new damage on structures already weakened by age and prior events. Storm surge, flooding, and debris impact superstructures directly. Saltwater intrusion from storm surge accelerates steel corrosion for years afterward.
| Storm | Year | Category | Key Bridge Impact |
|---|---|---|---|
| Katrina | 2005 | 5 (landfall 3) | I-10 Twin Span catastrophic failure; 64 spans collapsed |
| Rita | 2005 | 3 | Compounded Katrina damage |
| Gustav | 2008 | 2 | Widespread infrastructure damage |
| Isaac | 2012 | 1 | $1.075B total damage |
| Laura | 2020 | 4 | Riverboat struck Calcasieu Bridge piers |
| Delta | 2020 | 2 | $2.9B damage |
| Ida | 2021 | 4 | $55B damage; Port Fourchon area devastation |
Hurricane Katrina alone collapsed 64 spans of the I-10 Twin Span Bridge over Lake Pontchartrain. Two storms struck in 2020 within six weeks of each other: Laura in August and Delta in October. Hurricane Ida in 2021 caused an estimated $55 billion in total damage and devastated infrastructure around Port Fourchon, a hub for offshore oil and gas operations. (NOAA; LADOTD)
Subsidence and Soft Soils
Coastal Louisiana is sinking. Subsidence rates range from less than 1mm per year in some areas to more than 10mm per year in others. The causes compound: natural soil compaction, oil and gas mineral extraction, approximately 10,000 miles of petroleum extraction canals, saltwater intrusion, and wetland erosion. Much of southern Louisiana lies at or below sea level. (USGS; LSU Coastal Studies Institute)
Soft soil conditions provide less stable foundation support for bridge piers. Continuous settling changes bridge geometry and loading patterns. Bridges in subsidence-prone areas can progress from fair to poor faster than aging alone would predict. (LADOTD)
Repetitive Flooding
More than 43,000 Louisiana properties have filed multiple flood insurance claims in the past 10 years. Jefferson and Orleans Parishes account for 40% of the state's repetitive flood claims. Repeated inundation causes cumulative damage to bridges: concrete degradation, steel corrosion, bearing and joint deterioration. (FEMA; NFIP)
Vessel Strike Risk
In March 2025, following the Francis Scott Key Bridge collapse in Baltimore, the NTSB identified eight Louisiana bridges facing unacceptable vessel strike risk. Among them is the Huey P. Long Bridge, where a vessel collision is statistically expected every 17 years. (NTSB March 2025)
Where the Problem Is Worst
The highest poor rates concentrate in north-central and northeastern Louisiana, where rural parishes have smaller tax bases and older bridge stock. The contrast with the river parishes between Baton Rouge and New Orleans is striking: St. John the Baptist Parish has zero poor bridges out of 40, and St. Charles Parish has one poor bridge out of 82. (NOLA.com 2024; ARTBA 2025)
| Parish / Region | Poor Bridges | % Poor | Key Context |
|---|---|---|---|
| Red River | 20 | 32% | Highest parish poor rate |
| Claiborne | 40 | 29% | North Louisiana |
| Bienville | 52 | 28% | North Louisiana |
| East Baton Rouge | 114 | 21% | Largest metro parish count |
| Statewide | 1,423 | 11% | #7 nationally |
Source: NOLA.com parish-level bridge data analysis (2024); ARTBA 2025 Bridge Report for statewide row.
Red River Parish has a 32% poor rate, nearly three times the statewide average. The pattern extends through Claiborne (29%), Bienville (28%), and other north Louisiana parishes, where many bridges were built decades ago for lighter vehicles and lower traffic volumes. (NOLA.com 2024)
The I-10 corridor carries a disproportionate share of the state's highest-traffic deficient bridges. Four of the five highest-traffic structurally deficient bridges statewide are on I-10. The I-10 Veterans Memorial Highway Bridge in Jefferson Parish carries approximately 178,000 vehicles per day and is structurally deficient. (FHWA NBI)
Baton Rouge has 122 structurally deficient bridges out of 613 total, approximately 20%. The I-10/I-110 junction ranks among the top 20 trucking bottlenecks nationally. The 85-mile corridor between Baton Rouge and New Orleans loads bridges with heavy petrochemical freight well beyond typical highway use. (FHWA NBI; ATRI)
Louisiana ranks #9 nationally for the highest rate of rural bridges in structurally deficient condition. Coastal parishes, while not uniformly the worst by percentage, face unique threats from subsidence, salt air, and storm surge that accelerate deterioration. (ARTBA 2025)
The Funding Gap
Louisiana's gas tax is 20 cents per gallon. It has not changed since 1990, 36 years. The state ranks approximately 40th nationally, and the tax has lost more than half its purchasing power over that period. (LADOTD; ITEP)
In March 2025, Louisiana Amendment 2, a comprehensive tax reform measure, was defeated at the ballot. The state's primary mechanism for increasing transportation revenue failed to clear the electorate. (Louisiana Secretary of State)
Federal funding fills much of the gap. LADOTD operates on an approximately $2.3 billion annual budget, and federal funds account for roughly 52% of it, about $1.2 billion annually from FHWA. The IIJA Bridge Formula Program is providing approximately $1.0 to $1.1 billion over five years, with a first-year allocation of $202.6 million. As of June 2025, $322.3 million had been committed to 140 projects, targeting approximately 400 bridges statewide. (ARTBA Louisiana Profile; FHWA)
The bridge backlog stands at $1.9 billion according to FHWA estimates. The broader infrastructure backlog for all roads and bridges ranges from $14 to $18 billion. (FHWA; TRIP)
The cost is not abstract. TRIP estimates that deteriorated, congested, and unsafe roads and bridges cost Louisiana motorists $9.9 billion per year statewide. In New Orleans, the per-driver cost exceeds $3,000 annually. In Shreveport, it exceeds $2,700. (TRIP)
Act 486, passed in 2021, created a phased dedication of motor vehicle sales tax revenue to the Transportation Trust Fund. At least 25% is earmarked for preservation, with 75% directed to megaprojects and capacity improvements. It represents the state's most recent effort to address the structural funding mismatch without raising the gas tax. (Louisiana Legislature)
What's Being Done
The Calcasieu River Bridge replacement, described above, is the signature project: $2.3 billion, construction beginning March 2026, expected completion August 2031. It is the largest P3 in Louisiana history. (LADOTD)
The Jimmie Davis Bridge connecting Shreveport and Bossier City is a $361.7 million replacement under a design-build contract. Construction began in May 2024, with a 2,500-foot trestle completed in early 2025. Completion is expected in spring 2027. (LADOTD)
The Belle Chasse Bridge and Tunnel replacement, at $162 million, was Louisiana's first major transportation P3. Developed by Plenary and approved in 2019, it demonstrated the state's willingness to use private financing for infrastructure that traditional funding could not cover. (LADOTD)
In September 2025, the Landry administration announced the creation of the Office of Louisiana Highway Construction, a new state agency designed to bypass federal compliance timelines. The administration committed to fixing or replacing 62 rural bridges within 15 months, 47 of them in poor condition, using state-only funds to avoid federal regulatory delays. (Governor's Office)
The five-year trend supports the broader direction. Louisiana's poor bridge count dropped from approximately 1,600 in 2020 to 1,423 in 2025, the second-largest decline in poor-condition bridges nationally. (ARTBA 2025) The variety of approaches, from massive P3s to traditional design-build to state-funded rural programs, reflects a state drawing on every available tool.
The improving trend is real. But the share rated "good" has been falling as bridges age from good to fair to poor. The worst bridges are getting fixed while the overall inventory continues to age.
The Weight of Water
Half of Louisiana's 12,684 bridges, approximately 6,300, are rated "fair," the condition category that trends toward poor without sustained investment. Sixty-five percent of all bridges were built before 1980. The inventory is aging into the replacement pipeline at the same time the state is working to clear the backlog of structures already in poor condition. (ARTBA 2025; LADOTD)
The improving poor count is measurable and real. But Louisiana's bridges do not face only the ordinary pressures of age and traffic. They face hurricanes, subsidence, saltwater intrusion, and repetitive flooding on a cycle that no amount of routine maintenance can fully offset. The Calcasieu River Bridge, 74 years old and carrying 2.4 times its design traffic, stood as the most visible example of that accumulation for a quarter century. Its replacement is finally under way. The 12,683 other bridges remain. (ARTBA 2025)
What "Poor Condition" Means
A bridge is classified as being in "poor condition" if any one of its three primary components (deck, superstructure, or substructure) receives a rating of 4 or below on the NBI's 0-to-9 scale. A poor rating does not mean a bridge is unsafe or at risk of collapse. It means the bridge has deteriorated to the point where it needs repair or replacement. Bridges rated poor are typically subject to increased inspection frequency, load restrictions, or both.
Sufficiency Rating vs. NBI Condition Rating
This page references two different bridge assessment metrics. The NBI condition rating (scale of 0 to 9) evaluates individual components: deck, superstructure, and substructure. The sufficiency rating (scale of 0 to 100) is a broader measure of overall adequacy across structural condition, functional obsolescence, and essentiality for public use. A bridge can have a low sufficiency rating due to factors beyond structural condition, such as lane width or load capacity relative to current traffic. Both metrics are cited for the Calcasieu River Bridge and are labeled distinctly throughout.
Data Sources
Statewide totals (12,684 bridges, 1,423 poor, 11%, rank #7) are from the ARTBA 2025 Bridge Report, based on 2025 FHWA National Bridge Inventory data. Parish-level data is from a NOLA.com analysis of NBI data (2024). Hurricane damage figures are from NOAA, LADOTD, and NTSB reporting as cited inline. Funding data is from LADOTD, FHWA, TRIP, and legislative sources as cited. TRIP uses a total bridge count of 12,698, which differs slightly from ARTBA's 12,684. This page uses the ARTBA figure as canonical throughout.
Caveats
Bridge inspection practices and rating standards can vary by inspector and agency. The NBI captures a snapshot in time; individual bridge conditions change between inspection cycles. Parish-level percentages are rounded to whole numbers. The national average (6.7%) is ARTBA's published figure. The 62-bridge rural initiative cited in the "What's Being Done" section reflects announcements by the Landry administration and has not been independently verified for completion status.