Vegetation associated with various successional stages was studied on the Susitna River floodplain, southcentral Alaska, during 1981 summer. The objective of the study was to identify the vegetation successional sequence(s) and to approximate a time frame for these stages. Communities were classified into early (horsetail, balsam poplar, willow, and combinations), middle (alder, immature balsam poplar), and late (mature and decadent balsam poplar and birch-spruce). Sites were sampled using systematic point and belt transects of varying widths. Canopy cover, density by size class, ages, and crown dimensions, were measured. Alder stems were usually less than 30 years, while balsam poplar reached ages near 100 years. Birch and spruce ages approached 70 to 90 years. Successional stages were identified, but some successional pathways remain unclear.