Heat, waterholes and why the water stays cold

The postcard is red walls and a blue hole. The operator problem is that you can overheat on the approach and then lose core temperature in the water. Treat them as two separate go/no-go calls.

Dry heat hides sweat loss. People feel “fine” until they cramp on the exit. Electrolytes and 3 L+ water per walker are planning items, not optional kit.

Children and mixed groups need an adult who will say no — to the walk, to the swim, or to both.

Start at first light for anything strenuous. Official advice is to avoid strenuous activity in the heat of the day. That includes the Pound, Sonder ridge and Larapinta sections.

Check BOM Alice Springs — not a coastal city page. If the forecast is grim, Simpsons dawn only or stay in town. Write a hard out-time on paper.

Midday car parks are ovens. Never leave anyone in a vehicle. Not even “for a minute.”

Permanent holes sit in shade and deep rock. They stay cold. A long swim can bring on hypothermia even when the car park is 38 °C.

Enter slowly. No jumping, no diving, no inflatables as a personality. Submerged logs and ledges are normal. Get children dry and moving as soon as they are out.

A picnic without a swim is still a complete Ellery day.

Ormiston Pound Walk: short swim through deep cold water currently required. That is a yes-or-no before you start, not a surprise at kilometre eight. Pack a dry bag or skip the loop.

Ghost Gum Lookout loop: swim/wade currently required; use the lookout only if you will not swim.

Simpsons Gap: swimming is not permitted.

These notes change. Re-check park-open the morning you walk.

Use the easier waterholes itinerary: Simpsons + Ellery, hard no-Pound rule. Cold water and flies still apply.

One adult watches the water edge. One adult watches the car park. Fashion sneakers slip on creek-bed rock.

If anyone is quiet, nauseous or out of water, reverse now. Do not “see how we feel at the next gorge.”

Heat: 3 L+ water, electrolytes, sun shirt, hat, high SPF, fly net.

Cold water: dry bag, a warm layer for after a swim, no cotton-only plan.

Comms: phone with offline map, and the understanding that 000 needs a signal. A PLB is a reasonable multi-day item — not a day-walk requirement we invent.

BOM Alice grim → Simpsons dawn or stay in town.

Anyone nauseous, quiet, cramping or out of water → reverse now.

Pound swim live and the party will not swim → Ghost Gum lookout + waterhole only.

Darken Drive or the road report ugly after rain → shrink to Simpsons or stay in Alice.

Summer West Macs are a different park. Use the heat-aware itinerary: one site, pre-dawn, mandatory abort. The Pound loop is a no unless you are experienced, starting in the dark, and willing to turn around.

A short dawn stop counts as a successful summer day. The next visit can be cool-season or a booked camp with a first-light walk — not a longer hot-day stack.