what is the most recent date founded in elk county?
CREATE TABLE table_57008 (
    "Park name" text,
    "County or counties" text,
    "Area in acres (ha)" text,
    "Date founded" real,
    "Stream(s) and / or lake(s)" text
)
SELECT MAX("Date founded") FROM table_57008 WHERE "County or counties" = 'elk county'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: what is the most recent date founded in elk county? ### Input: CREATE TABLE table_57008 (
    "Park name" text,
    "County or counties" text,
    "Area in acres (ha)" text,
    "Date founded" real,
    "Stream(s) and / or lake(s)" text
) ### Response: SELECT MAX("Date founded") FROM table_57008 WHERE "County or counties" = 'elk county'