Multiple Long Span Timber Bridges

When projects require long bridge crossings with fewer intermediate supports, multiple long span timber bridges provide an efficient structural solution that balances engineering performance, architectural beauty, and environmental stewardship. By combining multiple engineered glulam spans with strategically placed pile bent foundations, these bridges can cross wetlands, rivers, floodplains, valleys, and transportation corridors while reducing the number of supports within the crossing.

At York Bridge Concepts, every Multiple Long Span Bridge is custom engineered through our proprietary Decero™ Design Studio and delivered using our integrated Design-Engineer-Build™ process. Since 1985, we have completed more than 9,000 custom timber bridge projects throughout North America, creating innovative bridge systems that improve connectivity while respecting the natural environment. Multiple long span bridges are commonly used where spans exceed approximately 26 feet and repetitive span systems are not the preferred structural solution.

What Is a Multiple Long Span Bridge?

A multiple long span bridge consists of a series of engineered glulam beam spans supported by pile bent foundations and abutments. Unlike repetitive span bridges that utilize shorter, evenly spaced spans, multiple long span bridges use significantly longer structural spans to reduce the number of intermediate foundations.

This bridge type is commonly selected for projects that require:

• Longer bridge crossings
• Greater vertical clearance
• Fewer pile foundations
• Reduced environmental disturbance
• Improved hydraulic flow
• Enhanced architectural appearance
• Efficient structural performance

The result is a bridge system that combines the advantages of engineered timber with long-span structural efficiency.

Designed Through the Decero™ Design Studio

Every York Bridge Concepts bridge begins with the Decero™ Design Studio, where engineers and designers evaluate each project’s unique conditions before developing a custom structural solution.

Our design process considers:

• Crossing length
• Required span lengths
• Hydrology
• Geotechnical conditions
• Environmental permitting
• Structural loading
• Site topography
• Vertical clearance requirements
• Architectural goals
• Long-term maintenance planning

Rather than adapting a standard bridge design, every multiple long span bridge is engineered specifically for its site and intended use.

Why Choose a Multiple Long Span Bridge?

Multiple long span bridges provide several engineering and environmental advantages over shorter-span bridge systems.

Benefits include:

• Longer individual spans
• Fewer intermediate supports
• Reduced foundation construction
• Improved waterway flow
• Less impact on wetlands and waterways
• Efficient use of engineered glulam beams
• Architectural continuity across long crossings
• Flexible design for challenging terrain

By reducing the number of pile bent foundations, these bridges can help simplify construction while minimizing impacts within the crossing environment.

Applications Across Multiple Markets

York Bridge Concepts designs multiple long span bridges for a wide range of public and private developments.

Common applications include:

• Residential communities
• Master-planned developments
• Municipal roadways
• Public parks
• Greenway trail systems
• University campuses
• Resorts
• Golf courses
• Commercial developments
• Waterfront properties
• Nature preserves
• Floodplain crossings

Whether serving vehicles or pedestrians, every bridge is engineered to complement its surroundings while providing dependable long-term performance.

Engineered for Modern Load Requirements

Multiple long span bridges can be designed to accommodate a broad range of loading conditions.

Available design capacities include:

• Pedestrian loading
• Bicycle traffic
• Golf cart traffic
• Maintenance vehicles
• 5-Ton GVW
• H-Series loading
• HS20-44 loading
• HL-93 loading
• Project-specific engineering requirements

Each bridge is engineered according to the owner’s operational needs and applicable project criteria.

Sustainable Construction for Sensitive Environments

Many multiple long span bridges cross environmentally sensitive landscapes where minimizing construction impacts is a priority.

Whenever practical, York Bridge Concepts utilizes its proprietary Top-Down (Deck-Level) Construction™ methodology, allowing construction to advance from the completed bridge deck rather than requiring heavy equipment to travel through wetlands, waterways, or protected habitats.

This innovative construction approach helps:

• Protect wetlands
• Preserve native vegetation
• Reduce soil compaction
• Minimize erosion and sedimentation
• Maintain natural drainage
• Protect wildlife habitat

By combining longer spans with environmentally responsible construction practices, York Bridge Concepts creates infrastructure that supports both community connectivity and environmental stewardship.

Premium Materials for Long-Term Performance

Every multiple long span bridge is engineered using premium structural materials selected for strength, durability, and architectural quality.

Available material options include:

• Douglas Fir glulam beams
• Southern Yellow Pine structural framing
• Premium hardwood decking
• Composite decking
• Decorative railing systems
• Stainless steel hardware
• Protective coating systems
• Architectural lighting
• Custom stain finishes

Material selection is based on structural requirements, environmental exposure, maintenance objectives, and the owner’s design vision.

Featured Multiple Long Span Projects

York Bridge Concepts has completed multiple long span bridges throughout North America that demonstrate the versatility of this structural system.

Representative projects include:

Inspired Living – Alpharetta, Georgia

A custom multiple long span vehicular bridge engineered with glulam spans to provide dependable access while complementing the architectural character of the community.

River Lights – Wilmington, North Carolina

A multiple long span pedestrian bridge connecting recreational amenities within a waterfront master-planned community while minimizing impacts on the surrounding environment.

Thousand Trails – Acton, California

A custom multiple long span vehicular bridge restoring critical access across challenging terrain using engineered timber construction and sustainable installation methods.

Town Village – Marietta, Georgia

A custom multiple-span vehicular bridge supporting daily residential traffic while demonstrating York Bridge Concepts’ expertise in engineered timber bridge systems.

These projects illustrate how multiple long span bridges can provide efficient, durable, and architecturally distinctive solutions across a variety of environments.

Why Choose York Bridge Concepts?

For more than 40 years, York Bridge Concepts has specialized exclusively in custom timber bridge engineering and construction. Through our integrated Design-Engineer-Build™ process, we manage every phase of a project—from concept development and structural engineering through manufacturing and on-site construction.

With more than 9,000 custom bridges completed throughout North America, York Bridge Concepts has extensive experience designing long-span timber bridge systems for parks, municipalities, residential communities, resorts, commercial developments, and transportation infrastructure. Whether your project requires a pedestrian crossing, vehicular bridge, or complex environmental crossing, our multiple long span bridge solutions are engineered to deliver structural efficiency, long-term durability, and architectural excellence.