Annual QuarterQuad Survey
Below are maps that depict the statewide distribution and abundance of  selected noxious weed species in Colorado.

 

Data is requested from the County Weed Supervisors on an annual basis (no mapping was done in 2003) and infested acreages estimates are per 9,000 acre QuarterQuad.  A QuarterQuad is one quarter of a standard 1:24,000 U.S.G.S. 7.5min topographic quadrangle.

 

Each block of color represents an infested 9,000 acre area: lighter red blocks indicate the presence of relatively light or new infestations, while darker red blocks indicate the presence of a greater number of infested acres within the QuarterQuad.  Counties that have not reported their weed infestations are indicated with a cross-hatch pattern.

 

For more specific locations of noxious weeds, you should contact the appropriate County Weed Manager .

You may download QuarterQuad datasets at the bottom of this page.

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Weeds Mapped Statewide By QuarterQuad:

(Click on the names to view the map images and pictures of the weed)

Additional Weeds Mapped By QuarterQuad:

The maps below do not depict the statewide distribution and abundance of these eight weed species. Although the Colorado Department of Agriculture has not yet requested statewide data for these particular species, some county weed managers have volunteered this data and we have assembled the information here. These maps will continue to be updated as local jurisdictions provide additional data. If and when the Department endeavors to gather statewide data for these species, these maps will be moved to the list above.

 

Common Names	Scientific Names	Data Year
Canada thistle	Cirsium arvense	2002
Cheatgrass	Bromus tectorum	2002
Eurasian Watermilfoil	Myriophyllum spicatum	2004
Field bindweed	Convolvulus arvensis	2002
Jointed goatgrass	Aegilops cylindrica	2002
Musk thistle	Carduus nutans	2002

 

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Colorado Department of Agriculture · 700 Kipling Street · Suite 4000 · Lakewood, CO 80215-8000 ·(303) 239-4100