CREATE TABLE table_57008 ("Park name" TEXT, "County or counties" TEXT, "Area in acres  ( ha ) " TEXT, "Date founded" FLOAT, "Stream ( s )  and / or lake ( s ) " TEXT)

what is the most recent date founded in elk county?
SELECT MAX("Date founded") FROM table_57008 WHERE "County or counties" = 'elk county'
SELECT MAX("Date founded") FROM "table_57008" WHERE "County or counties" = 'elk county'