gage2reach

Look up NHDplus v2.1 reach ID for approximately 26,000 U.S. Geological Survey streagages active prior to 2012.

from gage2reach import nhd_reach_id, nhd_flowline_id
reach_id = nhd_reach_id('03339000')

flowline_id = nhd_flowline_id('03339000')

NHDplus reach lookup table generated using data at https://www.sciencebase.gov/catalog/item/577445bee4b07657d1a991b6

To regenerate the reach lookup table, first pull the data from ScienceBase and unzip

wget https://www.sciencebase.gov/catalog/file/get/577445bee4b07657d1a991b6?facet=GageLoc

Then run the following:

import pickle, bz2, shapefile

shape = shapefile.Reader("GageLoc/GageLoc.shp")

shape.records()[0]

gage_lookup_table = dict((row[9], {'reach_code':row[2], 'comid_flowline':row[-1]}) for row in shape.records())

with bz2.BZ2File("NHDPlus_v2.1_gage_lookup.bz2", 'w') as f:
    pickle.dump(gage_lookup_table, f)