WASHINGTON - Hurricane Katrina will reduce employment by 400,000 people in coming months while trimming economic growth by as much as a full percentage point in the second half of this year, according to a Congressional Budget Office assessment obtained by The Associated Press.

The CBO report said that Katrina's impact was likely to be "significant but not overwhelming" to the overall U.S. economy, especially if energy production along the Gulf Coast returns to pre-hurricane levels quickly.

"Last week, it appeared that larger economic impacts might occur, but despite continued uncertainty, progress in opening refineries and restarting pipelines now makes those larger impacts less likely," CBO Director Douglas Holtz-Eakin said in a letter to congressional leaders.

The CBO assessment was in line with the predicted impact of Katrina being made by many private forecasters, who have also cautioned that the effects could be much worse if rising energy prices cause consumers to cut back on their spending.

The CBO report said that it expected economic growth in the second half of the year would be reduced by between 0.5 percentage point and 1 percentage point. It put total job losses at around 400,000.

CBO, the nonpartisan agency that provides economic and budget advice to Congress, said before Katrina struck the expectations were that the economy would grow at an annual rate of between 3 percent and 4 percent in the second half of the year with employment growing by 150,000 to 200,000 workers per month.

Already, federal cost estimates for relief and recovery efforts are running as high as $150 billion, adding another broader economic impact - a worsening deficit picture.

The White House, with considerable fanfare, announced in July a $94 billion improvement in the red-ink outlook for the current budget year. At that time, it promised that President Bush would easily fulfill his pledge to cut last's year's record deficit in half by the time he leaves office.

The White House budget office in July was predicting that the deficit for the budget year ending Sept. 30 would drop to $333 billion, $79 billion below last year's record, and that next year's deficit would be $341 billion. Now, both figures are rising fast as the government spends about $2 billion a day on the Katrina relief effort, all of which adds directly to the deficit.

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Associated Press Special Correspondent David Espo contributed to this story.