Shepherd Wheel is a working museum in a former water-powered grinding workshop situated on the Porter Brook in the south-west of the City of Sheffield, England. One of the earliest wheels on the River Porter, it is one of the few remaining—and effectively complete—examples of this kind of enterprise, one that used to be commonplace in the Sheffield area. Its 5.5 m (18 ft) diameter overshot water wheel is powered from a large dam stocked with water diverted from the Porter Brook.