The 16-day government shutdown in October came at a $414 million economic loss to communities that host and surround national parks, the Interior Department said Monday.

Those figures are a preliminary estimate based on 7.88 million fewer park visitors in October compared with the previous three years. In the runup to the Tuesday release of President Obama’s fiscal 2015 budget proposal, the announcement serves as ammunition for the commitment to parks funding that Interior Secretary Sally Jewell has sought.