Indicators of the structure of the plant matter of the meadows of the Kaybasov subtaiga section of the Middle Ob floodplain are presented. The reserves of underground organs in a layer of 0–20 cm, the aboveground phytomass of meadows, and the characteristic parameters of the structure of plant matter were determined. It is shown that in this area, in the absence of floodplain flooding in dry and warm 2019, the indicators of the reserves of the structure of the plant matter correspond to forest-steppe conditions.