June 30 (Bloomberg) -- Delinquency rates on the least-risky mortgages more than doubled in the first quarter from a year earlier as U.S. efforts to help homeowners failed to keep pace with job losses that pushed more borrowers toward foreclosure.

Prime mortgages 60 days or more past due climbed to 2.9 percent of such loans through March 31 from 1.1 percent at the same point in 2008, the Office of the Comptroller of the Currency and the Office of Thrift Supervision said today in a report. First-time foreclosure filings on the loans rose 22 percent from the fourth quarter, the report said.

“I’m very concerned about the rise in delinquent mortgages and foreclosure actions,” Comptroller of the Currency John Dugan said in a statement released with the quarterly report. President Barack Obama’s plan to create “sustainable, payment- reducing modifications is a positive step that should show significant benefits in the coming months,” Dugan said.

Obama’s program, unveiled Feb. 18, aims to help as many as 4 million homeowners by modifying loans and calls for Fannie Mae and Freddie Mac to refinance mortgages for as many as 5 million borrowers who owe more than their houses are worth. Foreclosure filings surpassed 300,000 for a third straight month in May, according to RealtyTrac Inc., and the U.S. economy has shed about 6 million jobs since the recession began in 2007.

Serious delinquencies on prime loans, which account for two-thirds of all U.S. mortgages, rose to 661,914 in the first quarter from 250,986 a year earlier, according to the report. Overall, mortgages 60 days or more past due rose 88 percent from last year, the report said.

Modifications

Mortgages modified to help struggling borrowers stay in their homes fail within nine months more than half the time, the report said. About 53 percent of mortgages modified in the first quarter of 2008 were 30 or more days delinquent after six months; 63 percent were in default after a year.

“Serious delinquencies are a leading indicator of increased foreclosure actions in the future,” the report said.

About two-thirds of mortgage modifications by servicers used two or more techniques to make loan payments more sustainable, the agencies said in the report. About 70 percent of the workouts added missed payments and penalties to the outstanding balance. About 63 percent involved interest-rate reductions and about 25 percent extended the life of the loan.

Only 13 percent of modifications froze interest rates, and about 2 percent included a principal writedown.

The report covers the performance of 34 million loans totaling $6 trillion, the agencies said.

To contact the reporter on this story: Margaret Chadbourn in Washington at mchadbourn@bloomberg.net.

Last Updated: June 30, 2009 11:36 EDT