WATER SAFETY RESOURCE GUIDE
Water Safety in Colorado
Know the Principles. Know the Water.
Knowing how to swim is only part of being prepared. Colorado's pools, lakes, reservoirs, rivers, and streams present different conditions, but the fundamentals of water safety remain the same: water competency, appropriate supervision, life-jacket use, awareness of hazards, safe rescue, and emergency preparedness. Staying safe means understanding both your abilities and the water you're entering.
Boulder Reservoir.
EXPLORE THE FIVE CHAPTERS
Different Water. Different Risks.
A controlled swimming pool is intentionally designed to reduce uncertainty. Natural water is not.
Controlled Aquatic Environment
- known depth and boundaries
- controlled entry and exit
- relatively predictable water conditions
- high visibility
- defined swimming areas
- trained supervision or lifeguards where provided
Natural Aquatic Environment
- changing depth
- currents and moving water
- changing temperature
- limited visibility
- underwater hazards
- wind and weather
- changing shoreline or water levels
- potentially delayed emergency response
Chapter 01 / Cold Water
Warm AirDoes not meanWarm Water
Colorado's lakes, rivers, and reservoirs can remain dangerously cold even on warm, sunny days. Even in strong, experienced swimmers, sudden cold-water immersion can cause cold-water shock and can trigger:
- Involuntary gasping
- Rapid breathing
- Loss of breathing control
- Rapid loss of effective swimming ability as muscles cool
- Increased difficulty performing even familiar swimming movements
"Dress for the water temperature, not the air temperature."
Before You Get In the Water
- Life Jacket
- Wear a properly fitted life jacket when going out on the water.
- Cold-Water Protection
- Choose additional protection appropriate for the water temperature and activity.
- Not Prepared for the Conditions?
- Stay out of the water.
Chapter 02 / Lakes & Reservoirs
Not all waterIs what it seems
Many Colorado lakes and reservoirs are popular places to swim, paddle, and spend summer days. But they are natural water, and the environment around them can involve:
- depth and changing bottom contours
- limited underwater visibility
- cold water
- wind and quickly changing conditions
- changing water levels and shorelines
- submerged objects or vegetation
- distance from shore and from assistance
Kayaking on mountain water. Photo: Jerrod Brown / Colorado Aquatics Foundation
CPW notes that lakes and reservoirs can be very deep and warns swimmers not to overestimate their abilities in cold water. At CPW-operated swimming locations, there are no lifeguards on duty. Lifeguard availability and swimming conditions vary by location, so check locally before you go.
Mountain water changes the equation
Many Colorado lakes and reservoirs are fed by mountain watersheds, so their water can stay cold even when conditions on land feel warm, and conditions can change with seasonal runoff, precipitation, reservoir releases, and local weather. That is characteristic of many Colorado aquatic environments, not all of them.
High mountain snowpackSnowmelt streamsRiversReservoirs and lakes
Chapter 03 / Rivers & Moving Water
Moving waterChanges the risk
Moving water in a mountain environment. Photo: Jerrod Brown / Colorado Aquatics Foundation
What makes moving water dangerous
- current and changing flow
- rocks and underwater obstacles
- cold water
- limited visibility
- difficult entry and exit
- conditions that can be stronger than they appear from shore
Preparing for moving water
- assess the current before entering
- watch for rocks and obstacles
- identify entry and exit points in advance
- respect closures and warnings
- carry appropriate equipment
- seek activity-specific instruction
This article does not provide technical whitewater instruction or swift-water rescue training; those are specialized skills that deserve qualified, in-person instruction. For detailed river, paddling, and boating guidance in Colorado, review Colorado Parks and Wildlife’s water-safety and boating-safety resources directly.
Chapter 04 / Life Jackets
Swimming abilityIs not flotation
The CDC and Colorado Parks and Wildlife both emphasize properly fitted life jackets as an important layer of protection during boating and many activities around natural water.
- use a properly fitted life jacket sized for the wearer
- wear it rather than simply carrying it when conditions or activities call for it
- give children particular attention around natural water
Flotation toys and pool floaters are not substitutes for approved life jackets.
This article is not a complete boating-law guide. For current Colorado requirements, review Colorado Parks and Wildlife’s boating and life-jacket guidance directly.
Steamboat Lake, Colorado. Photo: Jerrod Brown / Colorado Aquatics Foundation
Chapter 05 / Before You Enter
Know the waterBefore you get in
A quick, practical sequence of questions and checks, not a substitute for activity-specific outdoor-safety instruction.
Know the conditions
Check weather, water conditions, warnings, closures, and activity-specific guidance.
Know the temperature
Do not assume warm air means warm water.
Know your ability
Be realistic about your swimming ability, experience, and the conditions you're entering.
Use the right equipment
Use an appropriately fitted life jacket when appropriate or required.
Know the environment
Understand depth, current, entry and exit points, visibility, and potential hazards.
Have a plan
Know who is supervising, how you would reach emergency help, and what you would do if conditions change.
Learning in a Pool. Preparing for a World of Water.
The underlying water-safety guidance comes from established authorities including the American Academy of Pediatrics, Centers for Disease Control and Prevention, and Colorado Parks and Wildlife. The following reflects how Colorado Aquatics Foundation interprets that guidance in the context of its mission.
We cannot recreate every Colorado aquatic environment inside a swimming pool. We can help people build the skills, knowledge, judgment, and respect for water that prepare them to interact with those environments more safely.
Learning to swim is the beginning. Understanding the water, recognizing hazards, and knowing when not to enter are equally important parts of water safety.
Know the principles. Know the water.
Keep Learning
Primary Sources
- Colorado Parks and Wildlife, Water Safety
- Colorado Parks and Wildlife, Boating Safety
- American Academy of Pediatrics, Prevention of Drowning: Policy Statement, Pediatrics, July 2026
- American Academy of Pediatrics, Prevention of Drowning: Technical Report, Pediatrics, July 2026
- CDC, Drowning Prevention
- National Drowning Prevention Alliance
Colorado Aquatics Foundation provides educational information and connects readers with authoritative water-safety resources. This information is not a substitute for professional medical, emergency, or safety guidance.