Journal of Commerce--Growth in import cargo volume at the U.S.’s 10 busiest container ports is expected to level off until the annual peak season begins in August, the National Retail Federation and Hackett Associates said in their monthly Global Port Tracker.

Volume through those ports in March totaled 1.08 million 20-foot-equivalent units, an increase of 0.3 percent that represented the 16th consecutive month of year-to-year gains. April is forecast at 1.18 million TEUs, a 4 percent increase from 2010, but year-to-year declines are forecast for May, June and July.

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