Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_81 (in_state_area VARCHAR, outlet VARCHAR, basin VARCHAR)
### Question:
What is the in-state area with an outlet of South Platte River and Big Thompson river as the basin?
### Answer:
SELECT in_state_area FROM table_name_81 WHERE outlet = "south platte river" AND basin = "big thompson river"