Well, we've confirmed, through an earlier misunderstanding, that Mayor Charlie Hales and Commissioner Steve Novick won't be proposing a $12 monthly "street fee" on households tomorrow. But now it looks like it'll be close enough.

Information from a document obtained by the Mercury suggests the proposal unveiled at a Thursday press conference will involve a $11.56 per month fee on single-family households, and $8.09 a month on low income households. Units in multi-family buildings, the document said, would be charged $6.79 per month ($4.75 for low income households). Not much more is clear about the proposal—including how much the fee structure would raise for Portland transportation funding.

To date, officials have only discussed fees of $8 or $12 per month for single family households, saying they would raise between $34 million and $53 million a year.

Chris Warner, chief of staff to transportation commissioner Novick, would neither confirm nor deny the newly obtained figures, saying an announcement will wait until tomorrow.

Update, 4:25 pm: Looks like the "street fee" proposal, as it will be proposed, would raise about $40 million a year for the first five years, well under PBOT's $53 million a year estimate for a $12 fee. It's possible that indicates a modified fee structure for businesses and local governments, but that's not clear right now.

Mercury News Editor Denis C. Theriault contributed to this report.