POST UPDATE: I’ve been accepted to the freelance design team for the Adventurer’s League. WAAAAHAAHHAHAHAHAHAHAH!!!!!!!!
Here is a little two page dungeon and encounter module I wrote as part of my Adventure’s League application. It was designed for five 3rd level players but can easily be scaled up or down as needed. You can also just take the map and dump in your own monsters. There’s also a bit of a puzzle and lots of opportunities to fall from a great height.
If you want to watch your players dodge arrows and cockatrice spines while climbing a bridge made of skeletons then this is the perfect encounter for you.
You’ll need the Monsters Manual for all the monster stats.
Shadow of the Axe 