National parks would close, as would the Smithsonian Institution and its world-class collection of museums clustered along the National Mall within sight of the Capitol. Officials were less clear about the Cherry Blossom Festival, scheduled for this weekend in Washington.
As for the broader talks, it appeared progress had been made on spending cuts demanded by Republicans, though Democrats warned that a series of unrelated GOP policy provisions remain unresolved.
Democrats have already ruled out agreeing to stop funding the year-old health care overhaul or to deny Planned Parenthood all federal money. And Reid has said he will not agree to any of the curbs Republicans want to place on the Environmental Protection Agency.
While the political wheels turned, hundreds of demonstrators rallied outside the Capitol, calling for budget cuts and a shutdown, if necessary, to get them.
"Shut the sucker down," one yelled, and the crowd repeatedly chanted, "Shut it down."