 Only about 4% were classified as having moderate levels of distortion or better, which is the target.Several other indices calculated by evaluating the colonization of the Wieseck with aquatic organisms (macrobenthos), confirm this poor condition.These values, which indicate structural impairment of the river, show that the middle reaches of the Wieseck at Großen-Buseck are "unsatisfactory", and the lower reaches in the urban area are "poor".