Three Arctic grayling Thymallus arcticus populations in the Tanana River drainage were assessed using mark-recapture experiments in 1992. Investigations focused on the estimation of abundance and stock composition. Arctic grayling were captured using pulsed-DC electrofishing. Population abundance estimated for Arctic grayling greater than 200 millimeter fork length in the Salcha River was 7,706 fish (standard error of 2,555 fish) for a density of 209 fish per kilometer. The Chatanika River population was assessed in three contiguous study sections along a 112 km reach of the middle drainage. Each section differed in capture probability, size and age composition, and density. Abundance of fish greater than 150 millimeter fork length was 19,095 fish (standard error of 1,778 fish) and ranged from 271 fish per kilometer in the upstream section to 89 fish per kilometer in the midstream section. Abundance estimated in three sections of the lower 50.0 kilometers of the Goodpaster River was 6,886 fish greater than 150 millimeter fork length (standard error of 809 fish). As in the Chatanika River, capture probabilities, composition, and density differed among sections. Density was highest in the downstream section (192 fish per kilometer) and least in the upstream section (84 fish per kilometer).