Raw steel production in the country's Great Lakes region fell to 666,000 tons in the week that ended Saturday, according to an American Iron and Steel Institute estimate.
Production dropped by about 7,000 tons, or about 1 percent, from the week prior. Most of the raw steel production in the Great Lakes region takes place in Indiana and the Chicago area.
Production in the Southern District was estimated at 607,000 tons, up from 569,000 tons a week earlier.
Total domestic raw steel production last week was about 1.82 million tons, up from 1.77 million tons a week earlier.
U.S. steel mills had a capacity utilization rate of 76.1 percent last week, up from 74 percent a week earlier. The capacity utilization rate had been 74.4 percent at the same time last year.
Domestic mills have produced an estimated 1.82 million tons of steel this year, up 0.6 percent from the same period last year. The mills had made about 1.81 million tons of steel by Jan. 4, 2013.
Steel imports fell by 17 percent to 2.32 million tons in December, according to the American Iron and Steel Institute.
The United States imported about 31.9 tons of steel in 2013, a 5 percent decrease from 2012. Imports grabbed a 21 percent market share last year.