Description
A digital representation of the watersheds of 43 sites on large river systems sampled by the
National Stream Quality Accounting Network (NASQAN) of the U. S. Geological Survey
(USGS) in 2000 was created primarily from 1:250,000 hydrologic units(HUCs) in the United
States. Watershed information from Canada and Mexico was incorporated to complete the
areas draining to the sampling sites from outside the United States. The sampled rivers are
in one of four major river systems: the Mississippi, the Colorado, the Rio Grande, or the
Columbia.
Resources
| Name | Format | Description | Link |
|---|---|---|---|
| Original Metadata | XML | The metadata original format | Open resource |
| Digital Data | XML | Landing page for access to the data | Open resource |