upstream (of/from something)along a river, in the opposite direction to the way in which the water flowsThe nearest town is about ten miles upstream.upstream of/from the bridgeoppositedownstreamOxford Collocations DictionaryUpstream is used with these verbs: swimSeefull entrySee related entries:Rivers and lakes
See upstream in the Oxford Learner's Dictionary of Academic EnglishSee upstream in the Oxford Advanced American Dictionary