Little is known about the effects of restored riparian forest buffers on transport of herbicides. The effect of arestored riparian forest buffer system (RFBS) on transport of two herbicides, atrazine and alachlor, was studied during19931994. Herbicides were applied above a restored 3zone riparian buffer system in April of 1993 and 1994. Bromide wasapplied as a tracer with the April 1993 herbicide application. The buffer system was managed based on USDArecommendations and averaged 38 m in width. The system included a grass buffer strip immediately adjacent to theapplication area (zone 3), an area of planted pines downslope from the grass buffer (zone 2), and a narrow area of plantedhardwoods containing the stream channel system (zone 1). Most of the herbicide transport in surface runoff occurred beforeJune 30 with about 250 mm of cumulative rainfall after herbicide application. During this period of higher herbicidetransport, atrazine and alachlor concentrations averaging 12.7 g L 1 and 1.3 g L 1 , respectively, at the field edge werereduced to 0.66 g L 1 and 0.06 g L 1 , respectively, as runoff neared the stream. The effect of dilution versus otherconcentration reduction factors (infiltration, adsorption) was estimated for surface runoff using the bromide concentrationdata. Concentration reduction was greatest per meter of flow length in the grass buffer adjacent to the field. There was onlyminor transport of herbicides through the buffer system in shallow groundwater. Average herbicide concentrations were ator below detection limits in groundwater near the stream for the entire study period. The restored riparian forest buffer hadsimilar effects on herbicide transport as a mature buffer.