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I have 1:250 streams data for a few western states. I find this scale to be excellent in many settings as base hydro data.
I have never been able to find a USA or better yet, NA wide dataset of this scale. Does anything like this exist for the USA or NA?
Look at the attached Idaho jpg for an example of this data 
The National Hydrologic Dataset offers all hydrology data in 1:100,000 (medium res) or 1:24,000 (high res) for all of the US.
