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The SARP River Classification Framework provides consistent categories of ecologically relevant attributes for streams and rivers across the region at the NHD+ segment scale. The attributes that are currently available include: 1) stream size: by basin area and mean annual flow; 2) gradient: by average segment slope; 3) EPA Level 3 Ecoregion; 4) TNC Freshwater Ecoregion; and 5) Ecological Drainage Units.  For more detailed information, go to the SIFN page on the SARP website at

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