Bed material grain size armoring ratios and lithology for bed material sampling sites in the umpqua river basin oregon a median grain size of bar surface and substrate b armoring ratio at each site computed as ratio of median grain size from the bed material surface and substrate. Us geological survey tidal umpqua river from its mouth at the pacific ocean to near scottsburg floodplain kilometer 0 to 409 river mile 0 to 28 us geological survey coast range umpqua river confined valley between scottsburg and east edge of the coast range floodplain kilometer 409 to 1529 river mile 28 to 100 us geological . These data were created to support preliminary assessment of channel stability and bed material transport on tillamook trask wilson kilchis miami and nehalem rivers northwest oregon. Channel change and bed material transport in the umpqua river basin oregon the umpqua river the main tributaries of the main stem umpqua river and their drainage areas are the smith river 961 km 2 elk creek 756 km 2 and the calapooya creek 637 km 2 figs 1 and 3
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