This guide consolidates useful information@ methods@ and reference materials that define the state of the art in the design of wood pole transmission structures@ commonly in the 69 kV through 345 kV range@ into one document. This guide addresses application of wood in transmission structures@ characteristics of wood@ methods of analysis@ loadings@ connections@ non-wood members@ erection and framing@ quality assurance@ electrical considerations@ testing and maintenance. Purpose The purpose of this guide is to provide Transmission Line Designers with a design overview of wood structures used for overhead electric transmission lines.