Bridge Safety Blog
Data-driven analysis of America's 624,000+ bridges. Condition ratings, infrastructure funding, safety technology, and what the National Bridge Inventory data reveals.
March 25, 2026
State Bridge Report Cards: Grading Infrastructure State by State
A comprehensive state-by-state analysis of bridge conditions, spending, and improvement trends using FHWA National Bridge Inventory data.
March 20, 2026
Bridge Capacity and Traffic Congestion: Where Bottlenecks Are Worst
Data analysis of the most congested bridges in America and how traffic volume relates to structural condition and maintenance needs.
March 14, 2026
Historic Bridges at Risk: Heritage Structures in Poor Condition
Historic bridges face unique preservation challenges. See which heritage structures are in the worst condition and what is being done to save them.
March 8, 2026
Bridge Sufficiency Ratings Explained
The FHWA sufficiency rating combines structural condition, functionality, and importance into a single 0-100 score. Here is how it works.
March 2, 2026
Understanding the National Bridge Inventory
The NBI tracks 624,000+ bridges across America. Learn what data it collects, how to interpret it, and what it reveals about infrastructure health.
February 22, 2026
The Worst-Condition Bridges on Major Commute Routes
Millions of Americans cross structurally deficient bridges on their daily commute. See which high-traffic commuter bridges are in the worst shape.
February 14, 2026
New Technology in Bridge Safety: Sensors, Drones, and AI
How emerging technologies like structural health monitoring sensors, drone inspections, and AI-powered analysis are transforming bridge safety.
February 10, 2026
The Future of Bridge Infrastructure: Materials, Design, and Funding
What the next generation of bridges will look like: ultra-high performance concrete, modular construction, and sustainable funding models.
February 6, 2026
Emergency Bridge Repairs: What Happens After a Failed Inspection
When a bridge fails inspection, a chain of events begins. Learn about emergency closures, load posting, repair timelines, and interim measures.
January 29, 2026
Corrosion and Bridge Safety: How Rust Destroys Infrastructure
Corrosion is the leading cause of bridge deterioration in America. Data on which regions and bridge types suffer most from rust damage.
January 20, 2026
How Long Does It Take to Replace a Bridge?
From design to completion, bridge replacement takes 3-10 years. Here is what drives the timeline and why some projects take decades.
January 12, 2026
Are Toll Bridges Safer? Comparing Toll vs Free Bridge Conditions
Toll bridges generate dedicated revenue for maintenance. Data shows whether this funding advantage translates to better condition ratings.
January 7, 2026
How Often Are Bridges Inspected? Federal Requirements Explained
Federal law requires bridge inspections every 24 months, but some bridges need more frequent checks. Here is how the inspection cycle works.
January 3, 2026
Bridge Deck Conditions: Why Surface Quality Matters
The deck is the most visible and most replaced component of a bridge. Data on deck conditions across America and what deterioration looks like.
December 18, 2025
Underwater Bridge Inspections: How Divers Assess Safety
Specialized dive teams inspect bridge foundations beneath rivers and lakes. A look at how underwater inspections work and what they find.
December 10, 2025
Railroad Bridge Safety in America
America has over 100,000 railroad bridges, many over a century old. How railroad bridge oversight differs from highway bridges.
December 5, 2025
Urban vs Rural Bridge Conditions: A Data Comparison
Urban bridges carry more traffic but get more funding. Rural bridges are older and more likely to be structurally deficient. The data tells the story.
December 1, 2025
When Bridges Close: The True Cost of Detours
Closed and weight-restricted bridges force millions of detour miles annually. The economic impact on communities, trucking, and emergency services.
November 21, 2025
The Best-Maintained Bridges in America
Not all bridge news is bad. These states and agencies maintain the highest-rated bridge inventories in the country.
November 13, 2025
Bridge Load Ratings Explained: H20, HS20, and HL93
Bridge load ratings determine how much weight a bridge can safely carry. A guide to the H20, HS20, and HL93 standards and what they mean.
November 8, 2025
Posted Bridges: What Weight Restrictions Mean for Trucking
Over 80,000 bridges in America have posted weight restrictions. How load posting works and its impact on freight and local economies.
November 4, 2025
Fracture-Critical Bridges: What They Are and Why They're Dangerous
Fracture-critical bridges have steel members whose failure would cause collapse. There are over 18,000 of them in America.
October 27, 2025
How Much Does Your State Spend on Bridge Repair?
State-by-state analysis of bridge repair and replacement spending. See which states invest the most and least per deficient bridge.
October 18, 2025
Covered Bridges in America: Preservation and Condition Data
America's remaining covered bridges are cultural treasures facing structural challenges. Data on their condition and preservation efforts.
October 10, 2025
How Winter Weather Damages Bridges: Freeze-Thaw and Road Salt
Freeze-thaw cycles and deicing chemicals are the top causes of bridge deck deterioration. Data on which states suffer the most winter damage.
October 5, 2025
Interstate Highway Bridges: Condition Analysis
The Interstate Highway System has over 60,000 bridges. A data-driven look at their age, condition, and the cost of keeping them safe.
October 1, 2025
Bridge Scour: The Hidden Danger Underneath America's Bridges
Scour erodes the riverbed around bridge foundations, causing more collapses than any other factor. Data on scour-critical bridges across the US.
September 9, 2025
Climate Change and Bridge Safety: Rising Waters and Extreme Heat
Climate change threatens bridges through increased flooding, thermal expansion, and extreme weather events. Data on the most vulnerable structures.
September 22, 2025
Highway Interchange Bridges: The Most Critical Interstate Structures
Interchange bridges carry the heaviest traffic loads in America. Analysis of their condition ratings and maintenance priorities.
September 14, 2025
Pedestrian Bridge Safety: Condition Ratings for Walking Bridges
Pedestrian bridges have their own condition challenges. A data look at walking bridge safety across American cities.
September 5, 2025
How to Look Up the Safety Rating of Any Bridge You Cross
Every bridge in America has a public safety record. Here is how to find condition ratings, inspection dates, and structural data for any bridge.
August 28, 2025
The Bridge Funding Gap: Where the Money Needs to Go
America needs $125 billion to repair structurally deficient bridges. Where the funding gap is largest and how current spending falls short.
August 20, 2025
Earthquake-Proof Bridges: Seismic Safety Ratings Across America
Seismic retrofitting has improved bridge safety in earthquake zones, but thousands of bridges remain vulnerable. Data on seismic readiness by state.
August 11, 2025
Bridge Weight Limits: Why They Matter and What Happens When Exceeded
Bridge weight limits protect structural integrity. What the posted limits mean, how they are calculated, and the consequences of overloading.
August 6, 2025
Bridge Guardrails and Barriers: Crash Protection Standards
Bridge railings and barriers are rated by crash test standards. How guardrail safety ratings work and which bridges have outdated protection.
August 2, 2025
The Rural Bridge Crisis: Why Small-Town Bridges Are Failing
Rural counties own 56% of America's bridges but have the least funding. Data on the disproportionate burden of bridge deficiency in rural areas.
July 25, 2025
Concrete vs Steel Bridges: Durability, Cost, and Ratings
Comparing condition ratings, lifespan, and maintenance costs between concrete and steel bridges using NBI data.
July 17, 2025
The Oldest Bridges in America Still Carrying Traffic
Some bridges in the NBI database are over 150 years old and still in service. A look at the oldest active bridges and their condition ratings.
July 8, 2025
What Does Bridge Maintenance Really Cost?
From routine inspections to major rehabilitation, bridge maintenance costs range from $5,000 to $50 million. A breakdown of where the money goes.
July 2, 2025
Movable Bridges in America: Drawbridge and Lift Bridge Conditions
America has over 1,000 movable bridges with unique mechanical maintenance needs. Data on their condition and the cost of keeping them operational.
June 30, 2025
Types of Bridges Explained: Beam, Arch, Suspension, and More
The seven main bridge types and how each performs in NBI condition ratings. Which designs last longest and which deteriorate fastest.
June 22, 2025
America's Most Traveled Bridges and Their Condition Ratings
The busiest bridges in America carry over 200,000 vehicles per day. How their condition ratings compare to less-traveled structures.
June 14, 2025
How the Infrastructure Law Is Changing Bridge Repair
The 2021 Infrastructure Investment and Jobs Act allocated $40 billion for bridges. Where the money is going and what has improved so far.
June 9, 2025
Bridge Paint and Coatings: The First Line of Defense
Paint systems protect steel bridges from corrosion. How bridge coatings work, what they cost, and why repainting is a multi-million dollar operation.
June 5, 2025
How Bridge Condition Grades Work: A-F Ratings Explained
BridgeSafety grades every bridge A through F based on deck, superstructure, and substructure condition. Here is exactly how the grades are calculated.
May 29, 2025
Lessons from Major US Bridge Collapses
From the I-35W collapse to the Francis Scott Key Bridge, each failure reveals systemic issues. What the data shows about collapse risk factors.
May 21, 2025
Worst Bridges by State: A Data-Driven Look
Every state has structurally deficient bridges. See which states have the highest percentage of poor-condition bridges and why.
May 12, 2025
How Bridge Inspections Work: A Complete Guide to FHWA Standards
Bridge inspections follow strict FHWA protocols. A detailed look at what inspectors check, how ratings are assigned, and what triggers action.
May 7, 2025
Pontoon and Floating Bridges: Unique Structures and Safety Records
Floating bridges are rare but critical in regions like the Pacific Northwest. How these unique structures are inspected and rated.
May 3, 2025
America's Structurally Deficient Bridges: Where They Are and Why It Matters
Over 42,000 bridges in America are rated structurally deficient. Where they are, how they got that way, and what it means for public safety.