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Read the Burn Before You Step In

Scottish glens are laced with burns, and most of the time they are little more than a splash across your boots. The trouble is that the same burn which barely wet your soles on the way in can be a shoulder-deep torrent by the time you walk back out. Catchments in the Highlands shed water fast: thin peat, steep coire sides and saturated ground mean that a heavy shower two ridges away can send a spate down within an hour. West coast glens, in particular, can turn a friendly crossing into a genuine obstacle while you are up on the hill.

Before you go anywhere near the water, stop and look at it properly. Stand back and read the whole channel, not just the bit at your feet. Peat-stained water is opaque, so you cannot judge depth by eye — a brown burn hides a boulder-strewn bed and sudden drop-offs. Look upstream for the colour and level of the water, and listen. A dull, continuous roar suggests a lot of volume moving fast. If the burn is carrying debris, branches or peat clods, treat that as a serious warning.

Judging Depth and Speed

Two questions matter: how deep is it, and how fast is it moving? Depth you can probe. Speed you can estimate by watching something float. Drop a stick or a leaf into the flow and pace alongside it on the bank. If it travels faster than you can walk comfortably — roughly a metre per second or more — it is powerful enough to knock you off your feet and carry you into rocks. Fast water only needs to be knee-deep to be dangerous, and even slow-moving water above thigh height can be hazardous on a slippery bed.

Then look for a better place to cross. Burns are rarely uniform. Useful options include:

• Wide, braided sections where the flow splits and each channel is shallower.
• Straight stretches with a gravelly or stony bed rather than deep pools.
• Points just below a riffle, where the water is broken and you can see the bottom.

Avoid bends, confluences and anything immediately above a waterfall or gorge. These are exactly where the current is strongest and where a slip has the worst consequences. A hundred metres of walking upstream or down often finds a crossing that is genuinely safe.

Kit Checks Before You Step In

Get your kit sorted on the bank, not in the middle of the channel. The single most important preparation is your pack. Undo the waist belt and the sternum strap, and loosen the shoulder straps. If you go over, you want to be able to shed the pack instantly rather than be dragged head-down by its weight. A rucksack full of wet kit weighs a great deal and will hold you under.

Other checks are quick but they matter:

• Put your waterproofs on. Even in summer, a Scottish burn is bitterly cold, and wind on wet clothing drains heat fast.
• Keep your boots on. Bare feet offer no protection against hidden rocks and far less grip on slime-covered stones.
• Take a trekking pole or a stout stick. One pole is a probe, a balance aid and a third point of contact all at once.
• Cross one at a time. If you are in a group, the strongest person goes first, and someone stands downstream as a spotter, ready to help.

Crossing Technique

Step in slowly and take your time. Face upstream, or angle yourself slightly downstream so the current presses against your legs rather than your back. Plant the pole upstream, probe the bed ahead, then move. Shuffle your feet rather than lifting them high — low, deliberate steps keep you in contact with the bed and reduce the chance of a foot becoming wedged between rocks. Keep three points of contact wherever possible: two feet and the pole, or a hand on a boulder.

Move diagonally across and downstream rather than fighting straight over. Look at the far bank, not at your feet; your balance follows your eyes. If the water is rising, or if it reaches above your knees and is moving quickly, stop and turn around. There is no shame in retreat, and a retreat is always cheaper than a rescue. If the water is genuinely cold and fast, your legs will numb within a minute or two, which is your cue to get out of it fast, one way or another.

If You End Up in the Water

Cold water shock is the first thing to manage. The gasp reflex and rapid breathing hit within seconds, so keep your head above the surface and concentrate on slowing your breathing. Do not try to stand up in fast water — a foot trapped between rocks in a strong current will push you over and hold you under. Instead, go into a defensive position: on your back, feet downstream, toes up and clear of the bed, arms out to the sides, head up. Steer with small strokes and work towards the nearest eddy, gravel bar or shallow bank.

Once out, get out of the wind immediately. Strip off wet layers, pull on dry clothing and a shell, and get into a shelter, tent or bothy. A hot drink and a sleeping bag help, but the real priority is stopping further heat loss. Watch for shivering that stops, slurred speech or confusion — signs that hypothermia is developing and that you need to get warm fast and stay put.

When to Turn Back

Spate burns fall nearly as quickly as they rise, so waiting thirty to sixty minutes often solves the problem entirely. Use the time to eat something, put on a warm layer and reassess. If the burn is still running hard, walk upstream towards the head of the glen where the channels braid and the flow splits, or accept a longer detour to a bridge or a landrover track.

For wild campers, the decision is often made the night before. If heavy rain is forecast, camp on the near side of a significant burn rather than crossing it late in the day. Set a turnaround time for your walk and stick to it, even if the summit is close. A hill can be revisited; a badly judged crossing is a different matter altogether. Read the water, trust your judgement and remember the oldest rule in the glens: if in doubt, don't.