Only Idaho Fish & Game (IDFG) Personnel may access these resources

Hydrologic Unit Code (HUC) Hierarchy Table

Mystified by the often-confusing terminology associated with water drainage naming and numbering?

This table relates well to the official NHD/USGS system (source: Wikipedia 2015Feb05).

The GIS layer Hydrologic Units includes Level 3 (3rd-code/6-digit) through Level 6 (6th-code/12-digit) polygons.


These images should help clarify, beginning at the HUC3 level,

Lower Snake River Basin selected:

Lower Snake River Basin description


Zoom in to HUC4 with Imnaha River (Oregon) Subbasin selected:


Zoom in to HUC5 with Upper Imnaha River Watershed selected:


Zoom to HUC6, South Fork Imnaha River Subwatershed selected:


Plant observations url alias update

The plant observations url aliases need to be updated from what they presently are to


...or something similar.

This should be changed here and you'll have to create a VBO view to update the existing aliases.

Partner access to observations data and exports

We need to find a way to identify data partners to allow access to view and download observations data.

SGS Waypoint Template

Use this Excel workbook as a template for submitting your SGS waypoints.