WASHINGTON » The average rate on the 30-year fixed mortgage held steady this week, staying slightly above the lowest level on record. Low mortgage rates have aided a modest housing recovery.

Mortgage buyer Freddie Mac said Thursday that the rate on the 30-year loan was unchanged at 3.55 percent. In July, the rate fell to 3.49 percent, the lowest since long-term mortgages began in the 1950s.

The average on the 15-year fixed mortgage, a popular refinancing option, slipped to 2.85 percent, down from 2.86 percent last week. That’s above the record low of 2.80 percent.