This repository is just some experimentation right now. To start it only provides NDHFlowlines, with the M coordinate stripped. Attempts to convert some of the other fully country layers didn't go as well.
The process to get the flowlines was to download the GeoPackage from https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Hydrography/NHD/National/GPKG/ and export was done with QGIS into FlatGeobuf. This did the spatial ordering, and then it was translated into GeoParquet with GDAL, using the defaults plus zstd compression.