+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
Rainbow and peace bridge are open 24/7 , 365 days.

http://www.cbsa-asfc.gc.ca/contact/listing/offices/office1022-e.html

maverick21 said:
got my passport returned 2 weeks after I sent it to cic.
does anyone know if the border is open on dec 26? that's the date I am planning to do my landing stamping. thanks.