The Provo Herald has this article about he issue. Here's a quote:

Reed Harris of the June sucker recovery program confirmed to the Daily Herald on Wednesday that six options will be presented to the public, and one of those will be shutting down the lower portion of the river. He said he did not know how much of the river would be made dry in the proposal, and he declined to reveal any more information about any of the options, saying officials prefer to reveal the options at the meeting.

But details of the proposal have been leaked, and more than 1,000 people have already signed petitions against the proposal. Organizers said they believe hundreds will show up at the meeting to protest.