October 16, 2026
This week’s photo is courtesy of- GeoLog, LLC, Cottonwood, AZ, USA.
Health Focus
Part 1 of 2: Cold Water
This week's Safety Focus opened on a single fact: falling into cold water can make you gasp before you can think. Here is what is happening inside your body when that happens, and the warning signs that come after.
The first minute: cold shock. The National Weather Service says cold water immersion can cause "dramatic changes in breathing, heart rate and blood pressure." The gasp is involuntary. So is the rapid breathing that follows. If your face is in the water when it hits, you can breathe water in.
It does not take ice water. The Weather Service warns that cold shock can be just as severe and dangerous in water of 50 to 60°F (10 to 15°C) as in water near freezing. Check the water, not the calendar.
Next: your muscles quit. The National Weather Service describes physical incapacitation as "a loss of muscular control in the arms, legs, hands and feet," felt "within seconds" in cold water. As it progresses, staying afloat without help becomes "virtually impossible."
Then hypothermia. Water pulls heat out of the body much faster than air at the same temperature, so a crew member who goes in, or works in soaked clothing, loses heat fast. The Weather Service notes that hypothermia begins when core body temperature drops to 95°F (35°C).
The warning signs. CDC lists the adult signs of hypothermia as shivering, exhaustion or feeling very tired, confusion, fumbling hands, memory loss, slurred speech, and drowsiness.
Look at that list again. Confusion, fumbling hands, and slurred speech also mean the person showing them is the worst judge of whether they are fine. The crew has to watch for each other. A helper who cannot work a shackle pin he handled easily an hour ago is not just tired.
Tomorrow: how to dress for the water, and what to do when someone is already too cold.
Key Takeaways:
• Cold shock changes breathing, heart rate, and blood pressure within seconds.
• Water in the 50s (°F) can be as dangerous as near-freezing water.
• Hypothermia begins at a core temperature of 95°F.
• Fumbling hands, confusion, and slurred speech are warning signs. Watch your crew.
Sources:
• National Weather Service: Cold Water Hazards and Safety
• CDC: Preventing Hypothermia
The Week in Review
Safety Focus: Working Near Water
• Cold water can make you gasp involuntarily, and a gasp with your head under can pull water into your lungs, because it is a reflex, not a skill problem.
• Undercut or cracked banks, fast water, cold water, and bad footing are field signs to treat the job as drowning-risk work.
• On construction work, OSHA 1926.106 requires Coast Guard-approved life jackets or work vests, inspected before and after each use, plus ring buoys with at least 90 feet of line no more than 200 feet apart.
• Reach or throw, never go: a rescuer who jumps in faces the same cold shock as the victim.
Knowledge Share: Groundwater and Surface Water
• Groundwater and surface water are a single resource, and where they are connected, a growing share of a well's water over time can come from a nearby stream, spring, or wetland.
• By superposition, the drawdown at any point is the sum of the drawdowns each well causes on its own.
• The stream depletion factor sets the timescale for how fast a well draws on a stream, and distance buys time, not immunity.
• Streamflow depletion keeps going long after the pump shuts off.
Keep a running notebook. Write each line above in your own words, and if you cannot say it to a helper without looking, give it another read.
New Vendor Highlights
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Work Hard. Work Smart. Stay Safe!
