Benton County staff weigh relocating Hayden Road covered bridge after structural and environmental hurdles

Benton County engineers on Tuesday told the Historic Resources Commission that the Hayden Road covered bridge, listed on the National Register of Historic Places, cannot safely carry heavier vehicles and faces both structural deterioration and environmental constraints that limit straightforward replacement.

The county's engineer, Laurel Beyer, and consultant Paul Topan described a roughly three-way choice: build a new vehicular bridge around the existing covered structure, which would require substantial stream work and large, fish-friendly culverts; decommission and salvage the historic timber and reconstruct it at another county-managed site; or attempt in-place repairs that would not restore full vehicular capacity. The commission did not take a formal vote; staff said they were seeking preliminary feedback before pursuing grant applications or design work.

Why it matters: the bridge is on the National Register of Historic Places and is one of three covered bridges in Benton County. It currently carries a state-imposed 12-ton weight limit, which prevents buses, large waste trucks and commercial vehicles from using the route. Fixing the bridge or constructing a nearby replacement would trigger state and federal environmental review because a side-channel near the road is classified as salmon habitat, staff said.

Beyer told the commission the bridge's condition means buses and large trucks cannot cross and that an eastern bypass would require reconstructing a short creek to meet fish-passage standards and installing a large culvert. Beyer said engineers and environmental reviewers found the roadside watercourse's mapping and legal status ambiguous; depending on the mapping and regulatory determination, any new crossing would have to be fish-passable and would require significant earthwork to regrade the channel.

County staff also reported encountering property-owner resistance to a bypass route through adjacent private land. Paul Topan said the property owners indicated they were unwilling to sell, which would push the county toward eminent-domain proceedings and substantially raise costs and schedule risk. Because of that resistance, the county has looked at relocation of the covered structure as an alternative.

Beyer and other staff outlined potential relocation sites on county parkland, including Clemens Park and the newly acquired McVee Campground near Alsea Falls. Relocation would involve disassembling and salvaging reusable timbers and decking, inventorying the structure for reconstruction, and rebuilding a new vehicular or pedestrian span in a park setting. Staff noted the county previously disassembled and relocated another covered bridge when it had been delisted, which simplified regulatory hurdles in that case.

The commission discussed ways to preserve the bridge fabric and record it if relocation proceeds. Commissioners suggested laser scanning and producing a point-cloud record to document every piece before deconstruction, and staff said they would explore student and university partnerships to help with digital documentation and reconstruction planning.

The State Historic Preservation Office (SHPO) has been consulted; Beyer said SHPO's response was "not a no," but that substantial analysis and documentation would be required before SHPO would sign off on relocation or major alteration to a listed structure. An academic participating online, Maria Paulo, said relocating significant historic structures is a documented practice and "it's technically feasible," while also cautioning that moving a structure changes some aspects of its historical context.

Commissioners expressed a strong preference for saving the bridge material rather than demolishing it. Autumn Peterson, chair of the Historic Resources Commission, and Commissioner Adrienne Fritz said they favored relocation and preservation where possible, and multiple commissioners offered technical assistance and volunteer labor if the county pursues deconstruction and reinstallation in a park.

No formal direction was adopted at the meeting. Staff said the next steps will be further site-level environmental analysis, outreach to property owners, follow-up with SHPO, and preliminary costing for relocation versus new construction. If the county proceeds with grant applications or detailed design, staff will return with a more developed recommendation and cost estimate.

Provenance: Discussion opened when the agenda moved to the Hayden Road covered-bridge project and concluded after commissioners' exchange of relocation preferences and offers of volunteer technical help.