A recent large-scale study of prescribed broadcast burning in western Montana required the development of a system for inventory of clearcut logging slash furls before and after fire treatment. The system is best suited for inventorying material which tends to be oriented parallel to the ground. The inventory system uses line intercept counts to compute fuel volume, weight, and surface area. 3P subsampling is used to inventory twigs (0-1 cm diameter). Data reduction was accomplished with specially written computer programs. When used with proper sufficient subsampling for auxiliary, collateral data, the system is well suited for the inventory of slash fuels in many forest types.