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Is it safe to follow a equestrian trail and assume I can ford where the horse-trail does? Or should I expect equestrians to ford rivers too deep or swift to ford on foot? I'm thinking of the situation in Iceland, where the topographic map may suggest routes for hikers or equestrians, and some of those may ford quite sizeable rivers.

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    Having been to Iceland, I'm imagining you must do this in the summer and not winter? My thought being that in the winter when everything is frozen (frozen waterfalls and geysers!!) then maybe it's actually more possible at times as a human rather than a horse.... that said, the question still stands. – djsmiley2k Oct 13 '17 at 18:01
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    You may need to remember that horses in Iceland tend to be on quite the smaller end of the equestrian size spectrum. – Bent Oct 13 '17 at 18:51
  • @djsmiley2k In autumn (September). Advantage: less water. Disadvantage: can be quite cold. One day I camped overnight hoping for a river to contain less water, next morning the water had 0°C, air probably -5°C. But I think the same river would have been unfordable in July. – gerrit Oct 13 '17 at 19:27
  • Reminded me of this.... youtube.com/watch?v=6UekVptK8Wo - How long do you think a person would last in that river? – user5330 Oct 15 '17 at 4:39
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    @mattnz My general rule of thumb is, no more than knee-deep unless flow is minimal, and never without a wading staff. – gerrit Oct 15 '17 at 11:04
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Actually, it is often the opposite--many fords which are fine for humans are unsafe for a horse and rider, because the ground is too rocky, or the area is too narrow or steep, or the ford relies on some tool like stepping stones or a safety rope that the horse can't use. On the other hand, horse-safe fords can be muddier and deeper than those meant for humans...not because it's not safe for humans, but just because most hikers don't like to get that wet. But realistically, most riders would prefer not to cross on horseback anything that they couldn't cross on foot if they really had to...because you never know when you might have to (if your horse goes lame for some reason). So you will probably be able to cross most (but not necessarily all) horse-safe fords, but it may not be very pleasant for you and there may be another crossing nearby that would be better suited for a human.

(Side note, you made a comment about asking someone else for a ride on their horse to get across--I think you were joking, but just in case, don't do this.)

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    Thanks for the answer, welcome to the site! Indeed I was joking. – gerrit Oct 13 '17 at 19:24
  • Well there was this place where horses waded across where I had to go around for a quarter of a mile to avoid soaking my stuff. – Joshua Oct 16 '17 at 2:34
  • I have seen documentaries where rangers/horseback trekkers ford sizeable rivers where their horses are essentially swimming... Should this be considered unconventional then? – fgysin Oct 16 '17 at 9:02
  • @fgysin Not that crazy, but I would expect most such crossings to be literally safe for a human, too (low flow)...just unpleasant. If it's deep enough for a horse to be swimming, the rider will be getting splashed, too, so I would expect water temperature, etc., to be reasonable, too, in those cases. – user3067860 Oct 16 '17 at 17:09
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Horses are bigger and stronger and than humans and because of the square cube law, they have more mass to surface area which makes them better suited to fording deeper/faster rivers.

As to whether or not you could cross where the horses do, that will depend on the individual crossing. You probably couldn't cross at all of the places horses can, but that doesn't mean that you would be able to cross at none of them.

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    Or I can wait for an equestrian and try to hitch a ride ;-) – gerrit Oct 13 '17 at 16:07
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    In slightly different terms, a horse has thin legs and a heavy body, so plenty of mass and not too much sideways force. It's also more stable than a human as it's got 4 real legs. But it depends on the ford. Some fords have essentially no flow, others are so fast and slippery that ankle deep is hard. Some have additional stepping stones for humans – Chris H Oct 13 '17 at 16:27
  • @gerrit That's how you drown a horse. – Agent_L Oct 15 '17 at 21:06
  • @Agent_L And then supposedly its riders as well. I wouldn't seriously plan on hitch-hiking with a horse :-) – gerrit Oct 16 '17 at 8:14
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I live in New Zealand, land of many rivers. Whether a river is crossable depends completely on depth and flow rate.

Whether a horse or 4WD could cross it is irrelevant, because the flow rate and depth vary depending on rainfall in the high country 2-12 hours ago.

I've seen river crossings that can vary from "Where's the water?" (because it's flowing below the ground) right up to "Where's the far side?", because it's 50 metres wide, and you can't see the far side for the rain.

Rule of thumb for a crossing:

  • If you can see shingle/rocks poking through the water, it's fine to cross.
  • If the water flow seems "fast" then stop and find another crossing point.
  • If the flow is "none-slow" you can cross up to hip depth.

When in doubt, roping up is safer. Not crossing here/now is safest.

And being tempted to try and balance on rocks to keep completely out of the water? That's a cue to get out the camera - rocks in a riverbed can be unstable and/or slippery.

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