Built in the 1950s, the Porte Class were designed specifically to operate the gates in anti-submarine booms. Later they were used primarily as peacetime training vessels for Naval Reserve personnel.
The Gate Class were named for gates that exist in the French fortifications of Quebec City and Louisburg.
Porte St. Jean was based in Halifax, NS.
40 mm removed and later used as training vessel. Refits increased bunking capacity. PORTE ST. JEAN was also fitted with a Vacu-San waste system to accomodate visits up into the Great lakes.