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The pictures can always be improved, but I see nothing amiss with the current selection. Streams are a generic name that is given to small rivers. A creek is another name for a stream, widely used regionally in certain parts of the world. There is no generally accepted point where a stream or creek should be called a river. It's true that Perkiomen Creek, in the article, looks somewhat large for a stream, but it is tributary which flows into a larger river, and tributaries are often referred to as streams or creeks. Maybe at other times of the year, Perkiomen Creek is smaller than the version we see in the article. --Epipelagic (talk) 23:17, 25 February 2012 (UTC)
Even more, "stream" is a common generic term for all rivers, creeks, brooks, and so on, of all sizes. The page's second sentence points this out. Pfly (talk) 23:48, 25 February 2012 (UTC)