### Question
How is the term Great Lakes shipping season defined?


### Answer
The term **Great Lakes shipping season** is defined in *46 U.S.C. § 55331* as the following:

> the period each year during which the Saint Lawrence Seaway is open for navigation by vessels, as declared by the Saint Lawrence Seaway Development Corporation

#### Citation:
  - *46 U.S.C. § 55331*
  - Heading: **Subtitle V-Merchant Marine > Part D-Promotional Programs > CHAPTER 553-PASSENGER AND CARGO PREFERENCES > SUBCHAPTER III-AMERICAN GREAT LAKES VESSELS**

