These small, direct tributaries to the main rivers are considered to be part of the "Mississippi watershed" or "Ohio watershed".

A list of the small, direct tributaries that have articles in Wikipedia is also shown.

The minor direct tributaries of the Mississippi include the following, which are parts of the "Mississippi watershed":

The direct tributaries of Bashahr were:

These creeks are both direct tributaries of the historic Bitterroot River.

Rivers of the Tulare Basin are noted below the San Joaquin's direct tributaries with their individual data.

It is a direct tributary of Lake Superior.

It is a direct tributary of the Nan River in the lower Nan basin.

A large number of rivers, all direct or indirect tributaries of the Po, cross the plains of Lombardy.

All direct tributaries of San Juan Creek, from mouth to source, are listed.