From dol.wa.gov website
•Is an EDL/EID required for entry into Canada or re-entry into the U.S.?
No, the Enhanced Driver License Program is completely voluntary. However, all U.S. and Canadian travelers must present a passport or other acceptable document that proves identity and citizenship when entering the U.S by land or sea. The EDL/EID is a low-cost alternative to the passport for U.S. citizens. For more information about: •U.S. requirements, visit the Western Hemisphere Travel Initiative (WHTI) website.
•Canadian requirements, visit the Canada Border Services Agency website.
