Historic Bridges of Iowa

Imes bridge

Madison county

Bridge information

Year constructed: 1870-1871
Alternate name: Wilkins Ford Bridge, King Bridge
Bridge type: Covered Timber Town Lattice Truss
Length: Unknown
Width: Unknown
Spans: 1
Jurisdiction: Madison County
Location: South of County Road G50 (E Main Street) over a natural depression in St. Charles, Section 24, T75N-R26W (South Township)

Details

To bridge the myriad of streams, the county board of supervisors ordered numerous short-span timber pile and kingpost structures built in the 1850s and 1860s. Though inexpensive to erect, most of these spans tended to be structurally suspect and required frequent maintenance to prevent their collapse. Moreover, they were restricted to short-span crossings. With limited funds and an abundance of crossings, the county elected to leave these earliest structures uncovered. This did not pose a serious threat to the timber pile spans, which rarely lasted long enough to suffer damage by rain and snow. But more complex and expensive timber trusses, left open to the weather, proved vulnerable to deterioration in their upper chord connections. For this reason, the county began sheathing its wooden through trusses with shingle roofs and plank siding in the late 1860s.

In 1870, the county supervisors visited the Donahoe, Wiggins and Wilkins fords to determine what order the bridges should be built. The board opted to construct a bridge at the Wilkins Mill first, completing it by June 1871. Like all of Madison County's covered bridges, it featured a Town lattice truss, overlaid by a queenpost truss frame. The Wilkins Ford Bridge carried traffic at this crossing for 17 years. In 1887 the county hired local contractor Benton Jones to move it to the Imes Crossing of Clanton Creek, southwest of Handley, Here it functioned in place for another 90 years, before it was again moved. This time the truss was taken to the eastern edge of St. Charles, where it stands today over a natural depression, the centerpiece of a small park. (New Paragraph) Popularized in literature and a recent movie, and visited en masse by tourists during the annual covered bridge festivals, the covered bridges of Madison County are easily Iowa's most famous spans. As a group, they well represent covered bridge technology, which predominated in the state before widespread adaptation of all-metal spans in the 1870s. With its 110-foot span, the Imes Bridge is the oldest of these bridges. It stands in well-preserved condition today [adapted from Fraser 1992].