A Klondike Nat'l. Historic Site, Dredge #4 was the largest wooden hull, bucket-line dredge in North America. It is 2/3 the size of a football field and 8 stories high with a displacement weight of over 3,000 tons with a 16 cu.ft. bucket capacity. It could dig 48 ft. below water level and 17 ft. above by using hydraulic monitors and washing the gravel banks down. In gold rich areas is produced as much as 800 ounces of gold in a single 24 hour day. It was built in 1912 and operated from 1913 to 1941, was disassembled, moved, re-assembled and operated from1941 until 1960.