Mosby Creek Bridge is a 90-foot Howe truss covered bridge spanning Mosby Creek near Cottage Grove in Lane County, Oregon. Built in 1920, it is one of the oldest surviving covered bridges in Lane County and carries Layng Road across the creek in a pastoral landscape of open pasture, willow-lined creek banks, and surrounding forest.
The bridge is situated within the celebrated covered bridge touring country south of Cottage Grove, where a remarkable cluster of historic covered structures spans the Row River and its tributaries within a small geographic area. At over a century old, Mosby Creek Bridge stands as one of the more senior members of this historic collection.
Mosby Creek Bridge was constructed in 1920, making it among the earliest surviving covered bridges in Lane County. The Howe truss system used in its construction had by this date been refined through decades of Oregon practice into a highly reliable and cost-effective design for rural road bridges of this scale.
Mosby Creek takes its name from James Mosby, an early settler of the Cottage Grove area who established a homestead near the creek in the 1850s. The creek drains the heavily forested hills east of Cottage Grove and enters the Row River system, which flows northward into the Willamette. The bridge at this crossing served the farming and logging communities that developed along the creek during the late 19th and early 20th centuries.
Listed on the National Register of Historic Places in 1987, Mosby Creek Bridge is one of the older additions to the historic register from Lane County's covered bridge collection. Over a century of service has been sustained through periodic maintenance and structural work, ensuring the bridge continues to carry vehicle traffic while retaining its original historic character.