Inauguration crowd estimates vary, but there's at least one number to count on: 5,000 porta-potties will be available on the National Mall on Inauguration Day, the Washington Post reported.
The National Park Service says there should be one toilet for every 300 people, which would mean the Mall will be able to accommodate 1.5 million bladders.
Metro is closing bathrooms at its 86 stations for security reasons, but the transit agency will rent about 150 portable toilets to place at its stations.
Thirteen museums on the Mall will be open, giving the crowd an alternative to the portable toilets.
