CREATE TABLE table_148 ("Team" TEXT, "Stadium" TEXT, "Capacity" FLOAT, "Highest" FLOAT, "Lowest" FLOAT, "Average" FLOAT)

What was the lowest highest attendance for the dumbarton team?
SELECT MIN("Highest") FROM table_148 WHERE "Team" = 'Dumbarton'
SELECT MIN("Highest") FROM "table_148" WHERE "Team" = 'Dumbarton'