How to Cross a Rope Bridge

Just being able to make a rope bridge doesn’t mean you’ll necessarily be able to cross it.  The less crossing ropes to your rope bridge, the more complicated the crossing will be.  For suspension bridges and any other bridge where you can plant your feet firmly and walk forward, that’s exactly how you cross.  Just be cautious of your footing.

For either a one or two rope bridge you will want to attach yourself to one of the ropes via a safety harness.  There are safety harnesses commercially available, but here at The Armageddon Blog, we like to assume the worst.  You can tie a Swiss Seat using a 6-10 foot length of rope.  This will prevent you from falling while crossing.

Postman’s Bridge (Two Ropes)

For a Postman’s Bridge you will need to devise a safety rope to tie your safety harness to the top rope of the bridge. I would suggest tying a bowline knot to a carabiner attached to the top rope, and another bowline knot tied to the carabiner attached to your harness.

Once you are attached, you will use the following system of movements in order to cross the bridge.

  1. Shift all your weight to your back hand and leg.
  2. Move your lead leg as far forward on the bottom rope as possible.
  3. Shift your weight equally between your legs and move your lead hand above your lead leg on the top rope.
  4. Shift your weight onto your lead hand and leg.
  5. Move your back hand up to your lead hand (move the carabiner for the safety rope up with this step).
  6. Move your back leg up to your lead leg.
  7. Repeat

This seems fairly easy, but there are a few things to be wary of. 

  • No matter how tight the bridge lines are, there will still be some wiggle in the rope.  Move slowly to avoid losing your balance.
  • If you’re crossing a river, it is entirely likely that the rope will absorb some moisture.  If this happens the rope will be slick: Make sure you have solid footing before shifting your weight.

Commando Bridge (One Rope)

There are two ways to go about this.  You can either cross on top of the rope or below the rope, either way will be equally taxing. 

Commando Crawl (On Top of the Rope)

For this, you lay on top of the rope with one leg bent, foot hooked on the rope and as close to the butt as possible.  The other leg dangles to maintain balance.  You move across the rope using the hooked foot and your arms to drag you across.  While it is harder to maintain your balance with this technique, it is a lot easier to stop and rest your muscles should they become fatigued.

Monkey Crawl (Beneath the Rope)

Grab on to the rope with both hands and hook both heels over the rope.  Move by crawling forward.  This is a simpler method to maintain, however it is much more taxing and nearly impossible to stop and recover should you become fatigued.  On the other hand, if you are using a safety rope you can simply let go with your arms or feet (but not both at the same time) to give them a break.

Crossing with Gear

Should you need to cross with any equipment, hopefully it is in bags.  Attach the bags to the line via carabiner and drag it along behind you.  You can attach the equipment carabiner to a rope and attach it to your safety line carabiner to make it easier to keep track of.

How to Tie a Swiss Seat

There are plenty of knots you can learn that will have much more use and be of more value than the Swiss Seat.  That is, until you need to go climbing or rope crossing.  The Swiss Seat is a makeshift harness that you can use to attach yourself to a rappel or bridge rope in case you don’t have a climbing harness.

  1. First of all, you need a length of rope 6-10 feet in length.
  2. Fold the rope in half, grasping the midpoint.
  3. Place the bight on your left hip.
  4. Wrap the rope around your waist on both sides, ensuring that the midpoint stays over the left hip.
  5. Pull one side under the other to make a half hitch. Repeat so that the rope turns twice around itself. This will eventually be where the carabiner is placed.
  6. Let the free ends of the rope fall to the ground, dangling in front of you.
  7. Reach between your legs from behind and grab each end of the rope in the adjacent hand.
  8. Bring the ends up to the outside edges of your back and tuck the ends under the rope at your waist from the bottom and over.
  9. Simultaneously squat and pull on the rope ends to tighten the seat as much as possible.  Repeat this step until the seat is sufficiently tight.
  10. To maintain the tension, run the ends under themselves from back to front, creating a loop around the waist rope directed back to the front.
  11. Tie the two rope ends into a square knot off-center to the left (to avoid snagging the line you are attaching to).

This should be uncomfortably tight around your body but not cutting off circulation, and certainly not squeezing… sensitive… regions.  After you’re all tied up, attach a carabiner to the wrap of ropes at the front of your body and then attach it to the line and your ready to go.

How to Make a Rope Bridge

There are certain skills that won’t benefit you right away in the P.A.W.  Knowing how to build a rope bridge is definitely one of them.  If you’re on your own and still wandering around looking for a safe location, this skill will be of almost no use to you.  However, if you’re traveling in a group with more gear than everyone can carry on their backs or you’ve made a permanent settlement and you cross that particular stream/chasm frequently, knowing how to build a rope bridge and cross it is an invaluable skill.

There are more types of rope bridges than you can shake a stick at, so I’m going to go over some of the most basic varieties: the one-rope, two-rope, three-rope, and simple suspension bridges.  All of them rely on several fundamental basics.

  1. Anchor all ropes on both sides of the bridge to a solid, permanent anchor point, like a large rock embedded in the ground or an old tree (big trunk).  In the military, they call these “bombproof” anchor points, as in if you were being shelled, your anchor points wouldn’t give way and leave you high and dry.
  2. You need a suitable loading platform on both sides of the bridge.  The loading platform is where you get on or off of the bridge.  With the more permanent bridge types, this is less of a concern because you can always build a suitable platform.  The platform needs to be relatively flat and close enough to the anchor rope that it isn’t difficult for anyone to attach themselves or any equipment to it.
  3. When constructing the bridge, make sure there is some space between your rope and the anchor point.  Once your bridge is complete, the ropes will all be incredibly taut but they’ll still move around a little bit once the bridge is in use.  If you don’t leave a gap, this can cause the rope to rub against the anchor abrasing the rope, weakening it, and risk the rope snapping.
  4. When tightening the ropes, be careful to not overtighten them.  This will put undue stress on the rope at the knots which could cause the rope, knots, or both to fail while using the bridge.
  5. Never let more than two people cross any of the bridges at a time, especially if they are carrying equipment with them.  The more weight placed on the system, the more likely it will fail.

Transport Tightening System

The anchor mechanism on the near side is referred to as the “transport tightening system” because it is tied in such a way that all the slack can be taken out of the rope, thus tightening the whole system.  It is a rope and series of knots tied around the anchor point in such a way as to secure the bridge and tighten the ropes to the desired tautness.

The first knot you will tie is a static knot (like a wireman’s knot or a figure-eight slip knot) around three to six feet from the anchor point.  Clip a carabiner through the knot with the gate facing upward.  Continue wrapping the rope around the anchor.  At this point you need to decide whether you’re going to do a “dry crossing” or a “wet crossing”.  A dry crossing is when everyone but the first person cross over the bridge.  A wet crossing is when the last person is required to dismantle the bridge prior to crossing. 

If you decide to perform a dry crossing, you will need to add a transport knot into the system.  I personally prefer this method because you only have to have one strong swimmer/climber to initially take the far side rope end to the far side.

Transport Knot

Now that you’ve brought the rope around the tree, go back to the part of the rope on the other side of the tree and make a loop with the piece of rope coming from the far side crossing over the piece that goes around the tree.  Now go back to the part that you just looped around the tree.  Make a bight in the rope and pass it through the back of the loop you just made and clasp it into the caribiner on your static knot further down the rope.

Tightening and Anchoring the Rope

If you didn’t tie the transport knot into the system, clasp the rope into the carabiner attached to the static knot.  Now you need to tighten the bridge.  Pull the loose end of the rope coming out of the carabiner until the bridge is the appropriate taughtness.  Tie the rope off on the anchor point.  You can tie the rope off with any number of knots, but the easiest on to use is a round-turn with two half-hitches.

Collapsing the Bridge

For a dry crossing,after everybody but the last two people have crossed, untie your rope anchor knot and tie it to the second-to-last crosser and have him cross.  As long as the slack end is directed toward the far end from the loop in the rope, the tension will be maintained.  If you want to be doubly safe, you can twist the rope at the carabiner to bind all the rope.  Once that person has crossed, pull the loop from the transport knot out of the carabiner and let the transport knot collapse.  At this point, you basically have a rope tied on the far end anchor point, that crosses to the near end, loops around the near anchor point and back across to the far end.  Have several people on the far end pull the rope tight and anchor the rope to the far end anchor point as described above.  After you cross, untie the rope at both end and pull on the end until all of the rope is on your side.

One-Rope (Commando) Bridge

The one-rope, or commando, bridge is the simplest to build and tear down, but the most difficult and physically demanding to cross.  As the name hints, you only use one rope to traverse your obstacle, meaning you’ll be in an awkward position, using pure muscle strength to drag yourself along the length of the bridge.  This is ideal if you’re only crossing with minimal gear and able-bodied individuals, and in a hurry.  Also, this is probably what your going to need initially when building a permanent bridge in order to move things back and forth during construction.

Crossing the Bridge

Crossing a bridge made with one rope can be tricky.

Two-Rope (Postmans) Bridge

The ever fancy Postman’s Bridge adds a whole additional rope to the Commando Bridge… Fancy!  In this configuration, you walk on one rope and hold onto the second rope at chest level or slightly above.

If you have a lot of equipment or people incapable of crossing a Commando Bridge, but you still need your bridge to be temporary and/or hastily constructed and dismantled, then the Postman’s Bridge is your best bet.  It is a reasonable balance of stability and expediency.  When constructing this bridge, you are basically just building 2 Commando Bridges at different heights.

Three-Rope (Monkey) Bridge

 The Monkey Bridge requires a bit more preparation, and because of the required resources and investment of time in this bridge, it is likely that you will use this in a semi-permanent capacity.  One benefit that this bridge has over the previously discussed is that it can be used to span further distances. 

Fortunately, the construction process is not overly complicated.  Lay your hand and foot ropes out and tie stringers onto them so that the strings wrap each rope at approximately three foot intervals. 

Build the shears by laying out two equal-length pieces of wood and tying them 2/3 of the way up.  Spread them apart at the feet and lash them to a cross brace.

Lay the foot rope in the crux of the lasher, tie it to the anchor on one end and then tighten and tie at the other end.  Do the same with the hand ropes, looping them over the tops of the shears first.

How to Tie a Figure Eight Slip Knot

The Figure Eight Slip Knot is an adjustable loop-on-the-bight knot.

  1. Make a bight in the rope.
  2. Hold the center of the bight in the right hand. With the center of the bight in the right hand and the legs of the rope secured, twist two complete turns clockwise.
  3. Reach through the bight and grasp the long, standing end of the rope. Pull another bight back through the original bight.
  4. Pull down on the short working end of the rope and dress the knot down.
  5. If the knot is to be used in a transport tightening system, take the working end of the rope and form a half hitch around the loop of the figure eight knot.

 

 

 

How to Tie a Wireman’s Knot

There are many knots that fall into the loop-on-the-bight category, but this one is particularly helpful when building a rope bridge (as described in an upcoming post).  This knot is basically tied by reverse french braiding the loops.

  1. Wrap two turns around the left hand (palm up) from left to right.
  2. Name the wraps from the palm to the fingertips: #1 (heel), #2 (palm), and #3 (fingertip).  Grab the #2 wrap (middle) and place it over the #1 wrap (heel).
  3. Grab the #1 wrap (now in the middle) and place it over the #3 wrap (fingertip).
  4. Grab the #3 wrap (now in the middle) and place it over the #2 wrap (heel).
  5. Grab the #2 wrap (now in the middle) and pull up to form a fixed loop.
  6. Dress the knot down by pulling on the fixed loop and the two working ends.  Pull the working ends apart to finish the knot.

How to Tie a Round Turn and Two Half Hitches

Knots are pretty important in survival.  Most people don’t realize it until they suddenly have to tie a rope and the knot collapses and they have no idea why.  One of the best knots for tying the end of a rope to a static object is called the Round Turn and Two Half Hitches.  Called this because of the components that go into tying it.  You turn the rope ’round the object and secure it with two half hitch knots.

  1. First, wrap the rope around your static object.
  2. Then loop the running end of the rope over the standing end.
  3. Tuck the running end of the rope through the loop created by the last step.  Pull to tighten the knot and push it back close to the anchor object.
  4. Wrap the running end of the rope over the top of the standing end again.
  5. Tuck the running end of the rope through the loop create by the last step (again).  Pull to tighten the knot and push it back close to the first half hitch.

This will create a stable knot that can take a fair amount of weight without weakening.