A fact from West Creek (Pennsylvania) appeared on Wikipedia's Main Page in the Did you know column on 9 May 2014 (check views). The text of the entry was as follows:
Did you know... that there are nearly 900 macroinvertebrates per square meter in the lower reaches of West Creek?
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Some of the prose is a bit "clunky". For example these two sentences could be combined, - "Shortly afterwards, it exits Sugarloaf Township.[3] Upon leaving Sugarloaf Township ..."
"Approximately 60% of the taxa are Ephemeroptera, 10% each are Plecoptera, and approximately 5% are Trichoptera." - You might like to add the common names for these taxa.
The lead is supposed to be a summary of the article and only contain information mentioned elsewhere. In the lead you mention the length of the creek but do not mention this in the body of the text.
The length such a basic fact that I think it's fine in the lead and doesn't need to be repeated. --