The Publication, National Transportation Statistics (NTS) 1997, has
been released by teh Bureau of Transportation Statistics (BTS,
http://www.bts.gov/ of the Department of Transportation (DOT,
This report describes the process of enhancements to the stream reach network,
ERF1, which is an enhanced version of EPA's RF1. The U.S. Environmental
Protection Agency's reach file (RF1) is a database ...
ERF1 was designed to be a digital data base of river reaches capable of
supporting regional and national water-quality and river-flow modeling and
transport investigations in the water-resources community. ...