A nearly $5.4 million bail has been set for a Portland man indicted on 55 sex-crime charges.

Thomas Walter Oliver

Thomas Walter Oliver, 35, pleaded not guilty Friday to the list of offenses that stretched more than one page on the daily court docket during his brief arraignment in Multnomah County Circuit Court.

The indictment followed an investigation into reports of sex crimes against six female victims -- both adults and juveniles, Portland police said.

"The victims include sex trafficking victims, domestic relationships and friends of the suspect," police said in a statement.

The alleged offenses occurred between June 2007 and March 2013, according to the indictment.

Oliver is accused of three counts of first-degree rape, seven counts of first-degree sodomy, 10 counts of third-degree rape, 12 counts of third-degree sodomy, 10 counts of third-degree sex abuse, two counts of using a child in a display of sexually explicit conduct, two counts of second-degree sexual abuse, two counts of first-degree kidnapping and two counts of second-degree kidnapping.

The nine-page indictment was returned on April 20, according to court records. The first 40 counts of the indictment stem from alleged crimes involving one person.

Portland police Detective Nathan Shepphard, a member of the Police Bureau's Sex Crimes Unit, arrested Oliver about 3:45 p.m. Thursday near Southeast Powell Boulevard and 37th Avenue, according to jail records.

"He's probably the most prolific guy I've investigated,'' Shepphard said Friday, adding that he believes a number of people will feel much safer with Oliver behind bars.

There was no challenge of the $5.395 million bail during Oliver's arraignment. He was represented by a court-appointed defense lawyer, Thomas MacNair.

Oliver was ordered to have no contact with the six girls and women in the indictment. His next court date is July 7.

Oliver, born in Baker City, has an earlier misdemeanor conviction for prostitution procurement in 2013, according to court records.

He told court officials that he's been living most recently with a girlfriend and their 7-month-old daughter in Southeast Portland. He said he has no current employment and isn't attending school, according to court papers.

Police ask anyone with information on the case to call Sheppard at 503-209-0943 or nathan.sheppard@portlandoregon.gov.

-- Allan Brettman

--Oregonian Staff Writer Maxine Bernstein contributed to this story