Historic Covered Bridge Committee Notes of March 11, 2015 for:
Kingsley Covered Bridge (Bridge 28) Serving East St. over Mill River, Clarendon, VT
Kingsley Covered Bridge Engineering Study
Vermont Agency of Transportation
has been assigned the task of preparing an engineering study for the Kingsley Covered Bridge in Clarendon, Vermont.
The present bridge Priority of Uses as defined by the Historic Covered Bridge Preservation Plan is "Special Use on
Roads." In this case vehicles are limited 3 tons. The engineering study will be presented at a meeting of the
Historic Covered Bridge Committee and all review comments will be incorporated into this study. The purpose of this
engineering study is to present rehabilitation recommendations for Bridge No. 28 (Kingsley Covered Bridge) over the
Mill River in Clarendon, Vermont. The engineering study was conducted in a manner consistent with current engineering
manuals and specifications. For those readers not familiar with engineering and/or covered bridge terminology, a
glossary of terms has been included in this study. The engineering study was compiled after review of numerous sources
of data including written reports and photographs taken during site visits. The intent of this study is to determine
structural damage deficiencies and to recommend solutions which best address the purpose and need as defined below.
Purpose and Need:
Purpose: The purpose of the project is to evaluate the Kingsley Covered Bridge for continued Special
Use on Roads (limited to 3 tons) crossing the Mill river in Clarendon, Vermont.
Need: The Kingsley Covered Bridge was last inspected by VTrans personnel in November of 2014. They
determined that the condition of the bridge would require repairs to the lattice truss superstructure. Some
replacement of the superstructure elevation boarding is also required.
History: The Kingsley Covered Bridge was built in (approximately)
1870 and is a single span town lattice bridge measuring 120.6 feet from end to end. The bridge has been
repaired various times throughout its lifetime, but appears to have maintained its original character of
Field Observations: VTrans personnel have recently visited the
site. At the last site visit in November 2014 detailed inspection occurred and items of repair work were
noted to be addressed. Only a limited list of repair items are addressed by this engineering study.
Covered Bridge Truss: The eighth cross tie from the north end
of the bridge is to be repaired. Also, missing trunnels in the lattice truss are to be replaced. Both
north and south bearing blocks on the downstream side of the bridge are to be replaced. New siding is to
be installed in the truss bearing areas on the downstream side of the bridge superstructure. All untreated
components of the wooden superstructure (except flooring) are to be treated with fire retardant and
Estimated Cost of repairs is $123,050. This includes timber coating fire
retardant at $12,500, and timber coating termiticide, insecticide/fungicide at $12,500.
Discussion of the best material with which to replace the rotted bearing blocks on the downstream side
of the bridge, suggested that green black locust would be superior to the traditional oak.
Meeting Adjourned 11:30 A.M.
Chair, Historic Covered Bridge Committee
[This article was originally posted June 21, 2015]