I could I could have added a lot more to this thread a couple of years ago. I don't have the pictures with me right now but when I get to Homer I will find some.
Here is a couple I had on line.
I prefer to set underwater in narrow channels that we have a lot of in the Lower Yukon Delta. Perfect
In trying to figure out a set for the 12-15 foot wide and wider streams I have used this set. I prefer to use a conibear but this is a snare set up.
I have a small stream that branchs off a larger one. About 10 ft wide the otter never seem to miss going in to have a look around. I set an outside bend. Fence it off with brush and sticks getting them close to the bank. It is a little deeper than normal so I set up three snares on this set. The location picks up 3-4 otter per year in the three years I set there.
Snares on pole with otter in the background. Snares are secured with a box nail that goes through an 1/8 inch ferule. Quick to place on the pole.
Fencing them into the bank will work on any size stream. Better to build fence early due to ice. But it keeps working all season. Just leave a narrow channel next to the bank that can be secured with a conibear or two. Or snare

On the top snare you can see my experimental attempt to hook up wires to use my continuity meter for checking. Using the snare cable as an electric current path- upon triggering the connection was pulled from the bullet breaking the current. If the bottom ones caught they would pull the first one down in there struggles. It worked. Just hook the continuity meter to the wire on one end and the snare on the other above the ice. Use on the conibear is easier to set up. No continuity Trap is set off. Using the bullet connectors is a good idea as it prevents a false reading when the wire ends acidentally touch the trap. Had beaver stay in a set for some extra time once when I had the elec wire hooked to a spring I forgot to take the safty trigger off of.
The meter is standard on my conibear otter sets. My otter sets don't get a lot of ice build up due to their locations in the small blackfish streams but it does build up. I keep it to a minimum with use of cardboard or plastic bags and snow on top of the hole. This is easier to remove than a foot of ice. Checking an under water set coverd with cardboard and snow in 30 seconds with a meter however makes for a lot of sets that can be checked in a day. Certain sets that do buld ice should be opened up every other 2 or 3 checks regardless. I would run my traps once per week. Otters can be left under the ice for up to two weeks without a problem. No more.
The cardboard works wonders on beaver sets as well. Even in the 30 below temps we had this winter my beaver sets never got more than a couple of inches of ice in 5 days.
With a good snow covering it works wonders. Cover with a good amount of snow.
Ice after a week of cold.

One of my favorite photos. Seemed we were always ending the line in the dark that year. The moon made for a great photo.
Fruits of our labor. Fully lined otter parka I made for my son.
Before otter prices came up.
Parka is inside out here to show the fur
There was a guy on the other forum, I believe from Kotz. He talked about putting a rapalla lure minus the hooks on a conibear trigger and catching otter. Anyone ever have any success with anything similar.