Bullwinkle is a 1,736 feet (529 m) tall, pile-supported fixed steel oil platform in the Gulf of Mexico. The total weight of the platform is 77,000 tons, of which the steel jacket comprises 49,375 tones. At the time of its construction it was the third tallest freestanding structure ever built after the CN Tower and Ostankino Tower and tallest in the United States, 6 feet higher than the pinnacle of the Sears Tower. Of the total height, 1,352 feet (412 m) are below the waterline. It is located in Green Canyon Block 65, approximately 160 miles (260 km) southwest of New Orleans. Bullwinkle belongs to Fieldwood Energy LLC. The total field development construction cost was US$500,000,000 according to some sources.