Water Recreation

Aquatic Nuisance Species (ANS) Information regarding boat/watercraft inspection and decontamination stations in Grand County Colorado for: 

• Three Lakes (Grand Lake, Shadow Mountain Lake, and Lake Granby)
• Williams Fork Reservoir
• Willow Creek Reservoir
• Wolford Mountain Reservoir

ANS Stamp Requirement for 2021

Motorboats and sailboats must have an ANS Stamp prior to launching in Colorado. 

Colorado residents can purchase an ANS stamp while registering the motorized (gas or electric) watercraft. For already registered motorboats and sailboats, ANS Stamps can be purchased online at www.cpwshop.com or at any CPW office or sales location. 

Exempt watercraft are not required to purchase an ANS Stamp.

ANS Stamp FAQ's

Colorado is a Mandatory Boat Inspection State 

All trailered and/or motorized (gas or electric) watercraft are required to be professionally inspected by state-certified personnel: 

• prior to launching in any water of the state after boating in a different state, 
• upon exiting any water in the state which is positive for an invasive species, and 
• any time an inspection is requested prior to entering or exiting a water body in Colorado.

Every boater is required in regulation to Clean, Drain, and Dry your boat, trailer and equipment every time you enter or exit any waters.

Boater's Guide to ANS Inspections