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Design-Engineer-Build By York Bridge Concepts
Boch Hollow Free-Span Bridge | Ohio Nature Preserve Infrastructure | Logan, OH
Boch Hollow State Nature Preserve Free-Span Timber Bridge
A Showcase of Ohio Preserve Infrastructure & Environmentally Conscious Timber Engineering by York Bridge Concepts
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.
Introduction: A Bridge Built for Preservation & Purpose
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.
A Free-Span Timber Bridge Designed for Ecological Protection
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.
80 Feet of Uninterrupted Span
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.
23 Feet of Vertical Clearance
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.
Glulam Beam Engineering: Strength, Durability, and Natural Aesthetics
Supporting the free-span design are glued-laminated timber beams (glulams), ideal for long-span applications that require exceptional performance and a natural look.
Why Glulam Beams Were Selected
- 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.
Cedar-Red Color Palette
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.
Deck-Level Construction: Protecting Sensitive Ecosystems
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.
Enhancing the Boch Hollow Trailhead Experience
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.
Environmental Stewardship in Ohio Preserve Infrastructure
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:
- No-impact stream crossings
- Reduced disturbance to protected habitats
- Use of renewable timber materials
- Preservation of hydrological patterns
- 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.
Timber as a Sustainable Choice
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.
Community Impact and Visitor Engagement
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.
Project Longevity & Maintenance
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.
Contributing to Ohio's Statewide Trail Network
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.
Conclusion: A Lasting Testament to Preservation, Engineering, and Natural 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.
