Most tributaries are small streams or creeks that feed into a major river or reservoir. The first thing that is immediately noticeable is the hole, which is located not directly in front of the incoming tributary, but off to the downcurrent side. The reason for that is simple. The incoming current is usually a much less force of current than that of the current it is meeting. When they meet, the lesser current gets pushed so to speak to one side and the hole begins forming on the downside .
Most anglers know about the primary hole.
It still applies to tributaries and odds are if you go a little up river of the tributary, you will find that hole. Sometimes, you might be lucky enough to have it all to yourself. Typically, when fishing the main hole, you are dealing with sandy or slightly mixed bottoms. There may be a few snags, depending on a multitude of variables. Most gamefish love tributaries.