The Ontario Bridge Standards Committee, consisting of representatives of the Ontario Ministry of Natural Resources (OMNR), Ontario Forest Industries Association, and Ontario Lumber Manufacturers Association, was established in early 1988 to formulate province-wide standards for all new forest-road bridges in Ontario. FERIC was approached by the committee in October 1988 to assist in the development of span designs for temporary log-stringer bridges. This report summarizes the design results in the form of graphs that relate allowable span length to stringer mid-diameter and spacing. span designs were developed for seven common tree species and two common types of bridge decks.