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Sawmill residue is an important component of biomass resources for California, but factors allowing for projections of future resources are not well established. Differences exist relative to species type and milling technology used in other western states for which residue factors have been developed. Sawmill residues produced in 2002 and 2003 were estimated by two methods. The first utilized lumber production and a sawmill residue volume factor while the second used total log consumption by sawmills and a sawmill residue weight factor. Sawmill residues generated in California were estimated as 2.43 2.82 million BDT in 2002 and 2.38 2.76 million BDT in 2003. Residues were also estimated for 1988, 1994, and 2000 for comparison to other reported estimates for sawmill residues in these years. Coarse and fine residues and bark accounted for approximately 45, 32, and 23% of total sawmill residues generated, respectively.