Nestled in the scenic terrain of the Appalachian foothills, the Boch Hollow State Nature Preserve represents one of Ohio's most impressive commitments to ecological preservation. From rugged ridgelines to protected wildlife habitats, the preserve exists to safeguard the region's rare biological communities, pristine streams, and sensitive forest ecosystems. As visitor interest in hiking, exploration, and conservation grows, trail infrastructure must rise to the same standard of environmental responsibility that defines the preserve itself.

York Bridge Concepts (YBC) was chosen to design and build a structural centerpiece worthy of such a landscape--an 80-foot free-span timber pedestrian bridge, engineered to cross a delicate tributary without requiring a single piling in the stream bed. Supported by long-span glulam beams, outfitted with composite decking, and finished in a natural color palette that blends into Boch Hollow forested canopy, the bridge now stands as one of the defining features of the trailhead experience.

This project is more than a crossing--it is an example of responsible Ohio preserve infrastructure, designed to honor the land, elevate the visitor experience, and set a precedent for future nature-based developments across the state.

 

Boch Hollow State Nature Preserve, located in the scenic hills of Hocking County, Ohio, is protected by the Ohio Department of Natural Resources and recognized for its ecological uniqueness. With sandstone gorges, cascading springs, and forests filled with threatened plant species, the preserve is a sanctuary for native wildlife and a destination for hikers seeking immersion in untouched natural beauty.

Managing such a landscape requires thoughtful infrastructure--amenities that help visitors access the land without disturbing the land. Recognizing this, the preserve has spent years enhancing its trail network, educational facilities, and access points. When the need emerged to connect a trail route across a tributary known for seasonal fluctuations and ecological importance, traditional construction methods were immediately ruled out. No in-stream work could occur, and no materials could disrupt the delicate channel.

This challenge demanded an alternative solution--one grounded in timber engineering, environmental sensitivity, and long-span capability.

York Bridge Concepts brought all of these components together through an 80-foot free-span timber structure that satisfies the preserve's ecological priorities and elevates the visitor experience. The project embodies the core values of Boch Hollow: protection, access, and harmony with nature.

 

At the heart of this project is a single overarching objective: protect the tributary at all costs. Boch Hollow's streambeds serve as habitat corridors, feeding the broader watershed and supporting biodiversity throughout the preserve. Any construction activity that introduced pilings, machinery, or sediment displacement risked altering these natural systems. Therefore, YBC engineered a solution that maintained complete clearance over the waterway.

 

The bridge's 80-foot free span is an impressive technical achievement for a timber trail bridge. By spanning from bank to bank without intermediate supports, YBC completely eliminated the need for:

• In-stream footings
• Temporary construction pads
• Equipment entering the channel
• Any excavation inside the waterway

The result is a bridge that hovers above the tributary like a natural extension of the forest floor--delivering access while leaving the stream in its original, untouched state.

 

In addition to horizontal span, YBC designed the structure with 23 feet of vertical clearance, ensuring that:

• Seasonal high-water conditions never engage the structure
• Debris flows do not accumulate at foundations
• Wildlife passages under the bridge remain unimpeded
• Hydrology remains fully natural

This forward-thinking design helps the preserve avoid long-term maintenance issues and protects the tributary from unnatural changes.

 

Supporting the free-span design are glued-laminated timber beams (glulams), ideal for long-span applications that require exceptional performance and a natural look.

 

• Superior Strength-to-Weight Ratio: Allows long spans without massive foundations.
• Architectural Consistency: Glulams visually complement the wooded surroundings.
• Dimensional Stability: Reduced warping and shrinkage over time.
• Sustainability: Manufactured from responsibly harvested renewable timber.

YBC designed the beams to carry pedestrian loads, environmental loads, and longevity requirements specific to the preserve environment.

 

The glulam beams feature a cedar-red color treatment--a warm, earthy tone that visually harmonizes with tree bark, fallen leaves, and natural understory hues. This choice was intentional:

• It blends the bridge into the natural scenery
• It avoids disrupting the visual character of the trailhead
• It enhances visitor experience without appearing artificial

The color palette helps the bridge appear as though it has always been a part of the landscape.

 

The deck system uses high-performance composite decking, a material YBC strategically selects for projects that require durability, non-slip safety, and long-term minimal maintenance.

Benefits of Composite Decking

• Moisture-Resistant: Ideal for humid forest ecosystems.
• Non-Slip Surface: Enhances safety for hikers, families, and groups.
• Color Stability: Maintains consistent appearance over time.
• Low Maintenance: Reduces long-term upkeep by the preserve.

For Boch Hollow's high-traffic trailhead, the composite decking ensures a dependable surface for decades of use in a high-moisture environment.

 

As with many YBC projects built in protected wetlands, nature preserves, and sensitive watersheds, the company used its proprietary Deck-Level (Top-Down) Construction Method.

This method minimizes site disturbance by:

• Using the structure of the bridge as the platform to build forward
• Avoiding heavy equipment in environmentally sensitive zones
• Reducing ground contact
• Eliminating the need for temporary roads or platforms
• Preserving root systems, soil composition, and understory vegetation

For Boch Hollow, this method ensured:

• No damage to the tributary
• No machinery entering protected habitat
• Faster and more efficient construction
• Minimal restoration requirements

This construction approach aligns perfectly with the preserve's conservation mission and demonstrates YBC's commitment to ecological integrity.

 

The new free-span bridge is more than an engineering feat--it is a defining feature of the trailhead experience at Boch Hollow. Visitors encounter the bridge early in their journey, and it immediately signals the preserve's dedication to thoughtful infrastructure.

A Gateway into Nature
The bridge acts as a formal transition between:

• The developed trailhead area
• The deeper, more remote natural experiences that lie beyond

Its architectural presence serves as an introduction to the preserve's ethos: protect the land while allowing people to explore it.

Improved Accessibility 
The bridge improves:

• Trail continuity
• Safety in wet seasons
• Access during stormwater events
• Visitor flow over the tributary

This ensures year-round usability and accommodates a broad range of visitors--from avid hikers to families and school groups.

Aesthetic Integration
With its natural palette and unobtrusive profile, the bridge:

• Blends seamlessly into forest surroundings
• Enhances photo opportunities
• Contributes to the visual identity of the trail
• Encourages visitors to pause, look down the tributary, and appreciate the ecology

It is both infrastructure and interpretive experience.

 

The Boch Hollow project exemplifies the future of Ohio preserve infrastructure--solutions that respect ecological systems, enhance public access, and stand the test of time.

A Model for Conservation-Based Construction
This project demonstrates:

1. No-impact stream crossings
2. Reduced disturbance to protected habitats
3. Use of renewable timber materials
4. Preservation of hydrological patterns
5. Minimal footprint throughout the lifespan of the bridge

By choosing long-span timber engineering, the preserve avoided:

• Concrete abutments in the stream
• Steel structures with high embodied carbon
• Large excavation impacts
• Visually intrusive construction

YBC's approach aligns with both ecological preservation and modern engineering best practices.

 

Every YBC project reinforces the benefits of timber as a sustainable building material. For Boch Hollow:

• Timber's low embodied carbon supports the preserve's climate commitments.
• Renewability aligns with conservation values.
• Natural aesthetics maintain harmony with the forest landscape.
• Light construction footprint helps maintain soil and stream integrity.

Combined with glulam technology, timber bridges deliver both environmental and structural advantages ideal for nature preserves and trail systems.

 

The bridge enhances not only infrastructure but also community engagement with the natural world. As more people explore Boch Hollow, the need for safe and sustainable trails grows. The bridge:

• Encourages outdoor recreation
• Supports park educational programming
• Enhances field trips and naturalist activities
• Strengthens connections between visitors and conservation initiatives

It is a small structure with an outsized community impact.

 

YBC designs bridges for decades of performance in rugged conditions. The Boch Hollow bridge benefits from:

• Glulam durability in fluctuating weather
• Composite deck longevity
• Minimal corrosion potential
• Low Maintenance materials

The preserve gains a structure that is both environmentally appropriate and financially efficient over its lifespan.

 

Ohio is rapidly expanding its trail systems and natural recreation strategies, and the Boch Hollow bridge aligns with statewide goals including:

• Increasing ecotourism
• Enhancing public access to preserves
• Protecting headwater streams and habitats
• Encouraging outdoor education
• Creating safe, sustainable trail crossings

At the state continues developing green infrastructure, projects like this establish benchmarks for environmentally responsible design.

 

The Boch Hollow State Nature Preserve free-span timber bridge stands as a testament to what is possible when engineering and ecology work hand in hand. Through thoughtful design, environmentally sensitive construction methods, and material choices that reflect the surrounding landscape, York Bridge Concepts has delivered a structure that enhances and protects one of Ohio's most treasured natural sites.

With its 80-foot free span, 23-foot vertical clearance, glulam engineering, composite deck, and nature-blending color palette, the bridge fulfills both functional and environmental priorities. it is not merely a crossing--it is an experience, a statement of values, and a model for future Ohio preserve infrastructure across parks, wetlands, nature preserves, and protected corridors.

YBC is proud to contribute to the long-term ecological mission of Boch Hollow and honored to deliver a bridge that will serve generations of visitors, hikers, educators, and nature enthusiasts.