These files were created with PKZIP from ARC/INFO version 7.1.1 exported coverages.  These files are being provided in self-extracting executable format, meaning that no software is needed in order to extract them.  To extract them, double click on them in windows program manager or explorer, or type the file name at a dos prompt and hit return.  They contain two files:

b(last seven numbers of Hydrologic Unit Code).shp, .shx and .dbf :

The banks coverage. Polygon representation of wide river sections, lakes, glaciers and other two dimensional water bodies. There are no attributes and the coverage is mainly useful for cartography.

Example: b7070101.e00 is the export of the banks coverage for huc 17070101 shown here, the Columbia R. between John Day and the mouth of the Snake R.

 

The streams coverage. Arc representation of the all linear water bodies. Centerlines are used to represent lakes, and other two dimensional features. Attributes are described in the PNW documentation.

Example: s7070101.e00 is the export of the streams coverage for huc 17070101 shown here, the Columbia R. between John Day and the mouth of the Snake R.