Start to finish, this trident farm can be built in as little as 20 minutes (if you know exactly what you are doing), and will probably get you a trident within the first 10 minutes of use. It's best suited for survival players who only want a few tridents and don't want to invest a lot of time in making anything more than a basic farm that gets used a few times.

*The farm works in 1.18+, but the build tutorial assumes that the build limit is still at Y255 (feet at Y256), so be mindful of how you follow the tutorial instructions.

Discord:   / discord  

Some post-production notes:
Press F3 to verify that you are building the farm across a river biome. Look for "Biome: minecraft:river". The parts of the farm that are in the river biome will spawn drowneds. River biomes spawn drowned at much higher rates than ocean biomes, and drowneds in the ocean are limited to spawning below Y 58, but this restriction does not apply to rivers.

The farm works for collecting nautilus shells as well.
Here is ilmango's river biome trident farm for some technical background:
   • River Biome Trident Farm  

Slime blocks can be used instead of honey blocks to spread water, but you can't ride on slime blocks. To set the ice without using a flying machine, bridge across with a line of dirt and replace it with ice and torches on the way back.

0:00 Intro
1:55 Materials list
2:41 Build tutorial
4:10 Setting down ice and torches
6:06 Finishing the build
7:11 Building the platform
7:33 Tips for hunting