A small-scale resampling of Crater Lake water was carried out in 1981. Water from three depths (surface, 3 m, and 14 m) was obtained an analyzed for 3H, 90Sr, 137Cs, and plutonium. The results indicate that 3H and 90Sr quantitatively remain in the water column and that the lake is well mixed. Twenty-five percent of the 137Cs and more than 90% of the plutonium has been removed from the water column, presumably into the sediment.