Definition of upstream in US English:


adjective & adverb

  • 1Moving or situated in the opposite direction from that in which a stream or river flows; nearer to the source.

    as adverb ‘a salmon swimming upstream’
    as adjective ‘the upstream stretch of the Platte’
    • ‘If you swim upstream in the river and struggle against the flow you give yourself a hard time and achieve nothing.’
    • ‘The company had three other projects upstream of the river.’
    • ‘After the long, straight stretch the river continues on upstream for many more kilometres.’
    • ‘For boats leaving the canal and heading upstream to York, that means waiting until the ebb tide turns to flood, and the current reverses to flow back upstream.’
    • ‘Follow the river upstream, ignoring another path to the left, and drop down to a weir and boardwalk by the river that leads to a track.’
    • ‘He had the right to have that river run through his land unimpaired and its quality undiminished except where it resulted from reasonable use of the river upstream.’
    • ‘In the August sunshine the salmon battle their way upstream against the fast flowing creek.’
    • ‘Sitting 100 miles upstream of where the river pours into the Gulf of Mexico, New Orleans quickly became an important port.’
    • ‘By January 4, angling clubs were reporting difficulties as the River Ouse was frozen upstream of Rawcliffe.’
    • ‘It felt heavy as it hugged the bottom, slowly moving out in the flow then upstream.’
    • ‘Two large streams joined the Tomahawk River approximately one-half mile upstream from the dam.’
    • ‘The moon is beginning to rise over the river and the city center is visible upstream where the river bends.’
    • ‘Lava flowing into waterways could create a hazard in the rivers upstream and enough ash would be carried by the wind to endanger aircraft and communities in the wind's direction.’
    • ‘As we continued upstream the river narrowed between vertical rock banks and at the Lower Force dropped in a single sheet.’
    • ‘A small village, 11 km upstream the Lidder River, is a beautiful locality.’
    • ‘When the medieval bridge was replaced with New London Bridge in 1831, the river could flow freely further upstream.’
    • ‘The 30 ft-long fin whale was in danger of being beached on a mud bank in a shallow river upstream from Oysterhaven.’
    • ‘An observation deck on a bend in the river is available so that visitors may enjoy both upstream and down stream vistas.’
    • ‘The agency expects to take about a month to complete the work, which will involve gaining access to the river over footpaths upstream of Alma Weir.’
    • ‘Water periodically released from upstream dams kill river crops downstream that grow on natural silt embankments in the summer months when the river's tide is out.’
    upstream from
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    1. 1.1Biology Situated in or toward the part of a sequence of genetic material where transcription takes place earlier than at a given point.
      • ‘In our case, the reference set was the upstream sequences of all the Arabidopsis genes.’
      • ‘Nine other sequences showed homology to regions upstream of known cereal genes.’
      • ‘Additional upstream sequences were needed to map the recombination breakpoints more precisely.’
      • ‘The same result was found for noncoding sequences upstream of accessory gland proteins.’
      • ‘The sequences upstream and downstream of the R-genes were examined to determine if clustering of genes could be detected.’
    2. 1.2 At a stage in the process of gas or oil extraction and production before the raw material is ready for refining.
      • ‘They produced a report on the safety of the upstream pipeline.’
      • ‘Project investment in the upstream sector, covering activities from oil exploration to production, takes up the largest portion.’
      • ‘The country's oil production problem is the poor condition of the upstream oil industry due to many years of neglect and the major investment and time required to boost production.’
      • ‘The company's annual output also now establishes it as Canada's second-largest upstream producer.’
      • ‘Heavey said that Tullow, as an upstream producer, will benefit in the short term if oil prices take longer to fall back to $22 a barrel.’
      • ‘He has also worked in communications, health, safety and environment at Shell, and spent much of his earlier career in upstream oil and gas production.’