The Long-term Soil Productivity (LTSP) study addresses two key factors—soil porosity and site organic matter—that potentially limit tree growth and site productivity in the timber-harvesting land base and that can be affected by forestry operations. These factors regulate basic site processes through their many roles; for example, in the exchange of water and gas, in creating physical restrictions on rooting, and in soil biological activity. The experimental design used in this study was a factorial combination of organic matter removal (stem only, whole tree, and tree+forest floor removal) and compaction (no compaction, light compaction, and heavy compaction) treatments, and included the major commercial tree species of interior British Columbia (lodgepole pine, hybrid white spruce, interior Douglas-fir, trembling aspen, and western white pine). This co-ordinated research network of 100+ field installations in Canada and the United States is being used to examine how these pulse changes affect soil processes that support vegetation growth and stand productivity. This report provides information on the LTSP sites in British Columbia so that future researchers can collaborate at forest productivity research sites where treatments are not confounded by other site disturbances, can directly assess compaction and organic matter loss, and can have a baseline comparison.