Are there any special rules to be aware of in order to do Tevilath Keilim in a creek or other natural body of water, as compared to a Mikvah?
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The Kitzur Shulchan Aruch Chapter 162 (translation here) talks about ritual immersion in a river, and cautions that according to many Rabbis, if the river's water is from rainwater (and not a spring) it is not valid. See there for more details.
There are 2 types of Mikvahs:
As far as special rules for natural bodies of water (mayim chaim), our Rav mentioned that certain of the poskim he consults with have a concern about doing tevila in a natural body after a heavy rain. If your dunking in water which is majority of rain water, then your tevila will be posul.