Definition of upstream adverb from the Oxford Advanced American Dictionary

 

upstream

 adverb
adverb
NAmE//ˌʌpˈstrim//
 
(upriver)upstream (of/from something)
 
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along a river, in the opposite direction to the way in which the water flows The nearest town is about ten miles upstream. upstream of/from the bridge opposite downstream
See the Oxford Advanced Learner's Dictionary entry: upstream