A DRG is useful as a source or background layer in a GIS, as a means to perform quality assurance on other digital products, and as a source for the collection and revision of other data.

DRGs are available in three scales: 1:250,000, 1:100,000, and 1:24,000.

Follow the links below to DRG resources:

Live Data

ArcIMS Image Map Service

Downloadable GIS Data

1:250,000-scale

Individual 1 x 2 degree quadrangles [UTM]	Image Map
Idaho state mosaic [IDTM83]	Download

1:100,000-scale

Individual 30 x 60 minute quadrangles [UTM]	Image Map
Idaho state mosaic [IDTM83]	Download

1: 24,000-scale

Individual 7.5 minute quadrangles [UTM]	Image Map
Individual 7.5 minute quadrangles [IDTM27] No Collar	List
Idaho state mosaic [IDTM83]	Download (2Gb)