Pictures are a must when you get it done. If you have a friend with a tractor it will make the job easier as far as placement goes. Been on some bridge building/fixing projects on quad trails. Always nice to see the finished project.

 

 

I had another idea. I would get something like this and just park it in the creek and drive over it. When I'm not using it (or if the gubmint complains) I can just winch it up on the other side and leave it there.

 

Just short of an amphibious bridge. Would take a big winch to pull it out.

 

It could look something like this

 

How will you anchor it down so it doesn't float/wash away?

 

I'd dig out the side you are putting it in/taking it out so you have an incline for the tires like a ramp. And, I'd tie it off to something like a big tree to keep it from moving.

 

Digging may not be allowed. I was thinking a pair of ramps made for loading a UTV into a truck would work if they could handle the weight. And a big winch with a ****** block to double the pulling power.

 

I'm thinking that I'm going to be seeing the end result of this one night on the news.
So anything that you put IN the creek will need to be anchored somehow. Even if your only putting it in to get across then lifting it out again immediately after. It'll need to be anchored, especially if it floats or has tires.
IMO, dragging a bridge across every time you want to use it will create too much damage to the opposite bank. Plus if you can't construct anything on the side that isn't yours then you can't have any type of pillar system to hold a span timber.
Having some sort of draw bridge will draw in-needed attention when it's seen. And having a 16ft bridge raised WILL draw attention.
Dropping some trees seems to be the best inconspicuous option. They too will need to be anchored so they don't float away during a flood or high water. Just pick a place that is hidden by a lot of brush.

 

Okay, I guess that solution had some problems. I don't want to damage the banks by rolling that trailer in and out of the creek. Also I wonder if there would be grease in the bearings that would leak out in the water.

Now I'm thinking of getting a set of these ramps and just plunking down the mid-support in the creek when I need it. Maybe make something from wood to stabilize the base so it can't tip forward/backwards. One end of the ramps would rest on each bank.