Morgan Covered Bridge

“The Morgan Covered Bridge, also known as the Upper Covered Bridge[2] is a wooden covered bridge that crosses the North Branch Lamoille River in Belvidere, Vermont on Morgan Bridge Road. Built about 1887, it is one of two covered bridges in Belvidere, and one of five in a five-mile span that all cross the same river. It was listed on the National Register of Historic Places in 1974.[1]

The Morgan Covered Bridge is located west of the center of Belvidere, carrying Morgan Bridge Road, a short connector between Back Road (running on the north side of the North Branch Lamoille River) and Vermont Route 109 (running to its south). It is a single-span Queen post truss structure, 62 feet (19 m) long and 15 feet (4.6 m) wide, with a roadway width of 12.5 feet (3.8 m). Its trusses include iron rods joining the apexes of the diagonals to the bottom chords. It has a gabled metal roof, and its exterior is finished in vertical board siding, which wraps around to the insides of the portals. The siding stops short of the eaves, leaving an open strip below the roof. The portal openings are framed as segmented arches. The bridge rests on abutments of stone and concrete.[3]

The bridge was built by Lewis Robinson, Charles Leonard and Fred Tracy. It is one of two 19th-century covered bridges (the other is the Mill Covered Bridge further west), and one of five on the North Branch Lamoille in Belvidere or neighboring Waterville, all within a five-mile span.[3]

There have been no major repairs necessary with this bridge recently, save for a new standing seam metal roof which a large number of covered bridges in Vermont received due to a grant. A study in the 1990s by the Vermont Agency of Transportation revealed that certain design details of the trusses allowed the bridge to be rated for a 9-ton load (1 ton more than the standard load limit for wooden deck bridges).[4] At this time, a sign at the bridge posts the limit at 5 tons.”-

Queen Post Truss:

“A queen post is a tension member in a truss that can span longer openings than a king post truss. A king post uses one central supporting post, whereas the queen post truss uses two.[1] Even though it is a tension member, rather than a compression member, they are commonly still called a post. A queen post is often confused with a queen strut, one of two compression members in roof framing which do not form a truss in the engineering sense.[2]

A queen-post bridge has two uprights, placed about one-third of the way from each end of the truss. They are connected across the top by a beam and use a diagonal brace between the outer edges. The central square between the two verticals is either unbraced (on shorter spans), or has one or two diagonal braces for rigidity. A single diagonal reaches between opposite corners; two diagonal braces may either reach from the bottom of each upright post to the center of the upper beam, or form a corner-to-corner “X” inside the square.[4]”-

Leave a Reply

%d bloggers like this: