diff --git a/services/apps/alcs/src/providers/typeorm/migrations/1716834660249-map_legacy_id_to_inquiries.ts b/services/apps/alcs/src/providers/typeorm/migrations/1716834660249-map_legacy_id_to_inquiries.ts
new file mode 100644
index 0000000000..c99e44bf79
--- /dev/null
+++ b/services/apps/alcs/src/providers/typeorm/migrations/1716834660249-map_legacy_id_to_inquiries.ts
@@ -0,0 +1,41 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+export class MapLegacyIdToInquiries1716834660249 implements MigrationInterface {
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+        DO $$
+        BEGIN
+            IF EXISTS (SELECT schema_name FROM information_schema.schemata WHERE schema_name = 'oats') THEN
+                WITH alcs_legacy_id_to_update AS (
+                SELECT
+                    ai.file_number
+                FROM
+                    alcs.inquiry ai
+                WHERE
+                    audit_created_by = 'oats_etl'
+                    AND legacy_id IS NULL
+                ),
+                issue_and_legacy_issue AS (
+                SELECT
+                    issue_id, 
+                    legacy_issue_nbr
+                FROM
+                    oats.oats_issues oi
+                JOIN alcs_legacy_id_to_update AS alcs_leg ON
+                    alcs_leg.file_number::bigint = oi.issue_id
+                WHERE
+                    legacy_issue_nbr IS NOT NULL
+                )
+                UPDATE alcs.inquiry 
+                SET legacy_id = COALESCE(issue_and_legacy_issue.legacy_issue_nbr, alcs.inquiry.legacy_id)
+                FROM issue_and_legacy_issue
+                WHERE alcs.inquiry.file_number = issue_and_legacy_issue.issue_id::TEXT;
+            END IF;
+        END $$;
+    `);
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    //NONE
+  }
+}