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ANS (Aquatic Nuisance Species) Alerts
ANS (Aquatic Nuisance Species) Alerts
Decontamination of boat.

​​​​​​​​ANS (Aquatic Nuisance Species) Alerts​

Updated ANS Inspection Guidance

Boating is allowed in State Parks during Governor Polis's Safer at Home order. Please go boating in your local area and do not travel to go boating; visit lakes or reservoirs in your local area. 

Boaters must comply with CDPHE requirements and CPW's Aquatic Nuisance Species regulations to stop the spread of zebra or quagga mussels and other invasive species.

  • Maintain a social distance of six feet minimum when interacting with CPW staff or other people.
  • Wait for the inspector to wave you forward to the inspection station. 
  • Remain in your vehicle, set the parking brake, and turn the vehicle off.
  • If you have a green seal receipt, please keep your window closed and show it to the inspector through the window glass.
  • Follow the inspector’s instructions if they need you to get out of the vehicle and assist with the inspection. Always maintain six feet minimum between you and staff or any other people.
  • Avoid groups larger than 10 individuals or gathering with anyone that doesn’t reside in your household. Local health board guidance may limit to groups as small as four persons; please know and follow all local health board guidance.

CPW encourages people to take local and state stay-at-home orders seriously, stay home when sick, and limit travel time wherever possible, even for approved recreation. 

Find the most up to date information on how CPW is responding to COVID-19 on the COVID-19 Response page.


Green Mountain Reservoir is Free of Invasive Mussels

After three consecutive years of negative testing, state and federal officials removed Green Mountain Reservoir from the positive waters list for quagga mussels. This de-listing makes Colorado a completely negative state for both zebra and quagga mussels.  

​For more information on Zebra and Quagga Mussels, please visit the Aquatic Nuisance Species page​.​