Invasive Species Management

Non-native invasive plants are one of the major threats to the Purgatoire Watershed. One example is that of Russian knapweed (pictured at right).


In January of 2016, the Purgatoire Watershed Partnership entered into a Memorandum of Understanding (MOU) with the Tamarisk Coalition (now RiversEdge West) and the Spanish Peaks-Purgatoire River Conservation District to formalize invasive plant management in the Purgatoire Watershed through the creation of the Purgatoire Watershed Weed Management Collaborative (PWWMC).

The PWWMC Coordinator, Shelly L. Simmons can be reached at Shelly’s focus is watershed-wide and will be centered on establishing the PWWMC as an independent, permanent, financially self-sustaining organization. For more information about PWWMC click here.

New and Recent Projects

Purgatoire Watershed Partnership Coordinating North Lake Noxious Weed Management Project


The PWP is working with the City of Trinidad, the Purgatoire Watershed Weed Management Collaborative, Spanish Peaks-Purgatoire River Conservation District and a local contractor to control noxious weeds on 8 acres of City land in the upper Purgatoire River watershed beginning October 2018.


"The City of Trinidad wants to be a good neighbor, working to control sources of noxious weed seed in the upper watershed to prevent transport downstream in the Purgatoire River," City of Trinidad Watershed Manager Gil Ramirez said.

The City will be working with a local contractor to control noxious weeds on approximately 8 acres of land adjacent to North Lake. North Lake is located approximately 40 miles west of Trinidad along Highway 12 in Las Animas County. Noxious weed species that will be treated include Canada thistle, common mullein, common burdock, scotch thistle, and houndstongue. These noxious weed species are officially listed on the Colorado Department of Agriculture's Colorado State Noxious Weed List. For more information and identifying photos of these plant species visit the CDA Noxious Weeds website.