Top Quality Manure Spreaders & Arena Rakes from Millcreek, Top-Quality Manure Spreaders & Arena Rakes From Millcreek At Millcreek Spreaders, we manufacture high-performance, low-maintenance manure spreaders and arena rakes. As farmers and equestrians ourselves, we know what it means to have durable, reliable, time-saving equipment on hand. That’s why.