No, you cannot legally walk across the Rainbow Bridge from Niagara Falls, NY to Niagara Falls, Ontario without a passport or an equivalent WHTI-compliant travel document. While it is physically possible to walk across the bridge for a small toll (currently $1.00), you will encounter Canadian Border Services Agency (CBSA) officers on the other side. To enter Canada, U.S. citizens must present a valid Passport, a Passport Card, or an Enhanced Driver's License (EDL). If you attempt to cross without these documents, you will be turned back at the border. Similarly, to re-enter the United States, you must present the same documents to U.S. Customs and Border Protection (CBP). While children under 16 may sometimes use just a birth certificate for land crossings, adults must have a photo ID that proves both identity and citizenship. In 2026, enforcement is strict, and "forgetting" your passport is not a valid excuse to bypass the international border checkpoints, even for a short walk to see the view from the Canadian side.