The Ridgeline trousers come out at circa 29". I have both the Roar, and the Pintail, which has a series of zips that allow you to adjust the length, 29" being the shortest.
The Roar are great, because they have an adjustable strap which allows you to tighten the bottom around the ankle. So even if they are a little long, you can stop them dragging on the floor. Roar are heavier duty than the other Ridgeline trousers, but also a little noisy.
The soft, quiet material, and extra pockets on the Pitail are great, but they are loose at the bottom, and are likely to drag unless you wear gators. Also found they were a little chilly, sitting in a seat in the howling wind, with it blowing up the trouser leg !
Next on my list "to buy", is the Ridgeline Torrent. The same soft quiet material, but has the ankle straps. Don't think they have many pockets though, and, seem to be in short supply at the moment.
All are rated as 100% waterproof.