WWETAC Projects

Project Title: Development of GIS-based maps for the "top 10" invasive weeds in Crook County, Oregon

Principal Investigators: Sim Ogle and Steve Dougill Crook County GIS Department, Prineville, OR


Collaborator (field work):  Brooke Gray from the Crooked River Weed Management Area

Key Issues/Problems Addressed:

In rapidly developing Crook County, Oregon, traditional ranching practices are threatened by the spread of invasive species and the accompanying increase in fire risk.  Insufficient information on proximity to invasive weeds is available to land owners and land-use decision makers. 

Setting and Approach:

Base GIS maps for monitoring the spread of invasive weeds were developed from existing local knowledge and data for 10 species.  Field teams verified and updated the existing data base.  Information was made available to the public through a web-based mapping application.

Key Findings:

The Crook County GIS & Western Wildland Environmental Threat Assessment Center (WWETAC) invasive weeds website was  updated with the latest weed locations and model predictions derived from Forest Service (USFS), Bureau of Land Management (BLM), Bureau of Reclamation (BOR) , Crook County, and the Crooked River Weed Management Area data for 2005, 2006, and 2007. Two species (Russian Knapweed - Acroptilion repens and Leafy Spurge - Euphorbia esula) had > 90% of their locations within 660ft of a water body (rivers & lakes). Two other species (Diffuse Knapweed - Ceanothus divergens and Hounds Tongue - Cynoglossum officinale ) had 90% of their locations within 660ft of a road. Data are incomplete because much of the sampling was conducted along roads.  The weed’s distribution showed very little habitat preference and the limited data was not enough to identify significant trends. 


The principal product of the project was the web mapping application. The scope of present field surveys and methods used limited potential analyses and mapping. Needed is more detailed spatial-temporal sampling over extended periods of time, as well as sampled controls away from roads.  The project facilitated land managers Central Oregon working together on weed problems.  They are securing of funds to extend the web application to include the six neighboring Counties that will provide a web site for land managers to view the distribution of the region’s most threatening invasive plants.

Crook County Invasive Weeds Project Poster (PDF)

WWETAC Project ID: FY06TS12