CREATE TABLE table_49333 ("Name" CLOB, "Built" CLOB, "Listed" CLOB, "Location" CLOB, "County" CLOB)

what's the listing date for the verdigris creek bridge in royal of antelope county?
SELECT "Listed" FROM table_49333 WHERE "County" = 'antelope' AND "Location" = 'royal' AND "Name" = 'verdigris creek bridge'
SELECT "Listed" FROM "table_49333" WHERE "County" = 'antelope' AND "Location" = 'royal' AND "Name" = 'verdigris creek bridge'