Transportation Secretary Paula Hammond will face legislators Thursday over her agency’s $890,000 error on the Nalley Valley Viaduct project.

Hammond has said blame for the misplaced ramp off of eastbound state Route 16 goes “up and down the agency” and said she and her staff could have communicated better in the months between the Department of Transportation finding the problem and the public learning about it.

It’s on the agenda for a regularly scheduled joint meeting of the House and Senate transportation committees Thursday.

Among the lawmakers getting the chance to grill Hammond is the chairwoman of the Senate panel, Sen. Mary Margaret Haugen, who has said she wants an investigation into how the mistake happened and why her committee wasn’t told.