The flow of woody biomass to end users is determined by economic factors, especially the amount available across a landscape and delivery costs of bioenergy facilities. The objective of this study develop methodology to quantify landscape-level stocks and potential biomass flows using the currently available spatial database road network analysis tool. We applied this methodology to a landscape of approximately 15 million acres around city Roseburg in southwestern Oregon. The analysis allows us produce isocost contour maps that display supply areas delineated by specific cost thresholds, as well as estimates of the amount of feedstock that can be delivered sites on an annual basis for specified haul cost. This methodology has the potential of providing useful information for determining the economically efficient scale and optimal location of a woody biomass utilization facility.