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_7 (length___ft__ VARCHAR, name VARCHAR)
### Question:
What is the length in feet of the Jiangzhou arch?
### Answer:
SELECT length___ft__ FROM table_name_7 WHERE name = "jiangzhou arch"