The Peach Orchard ford is about two inches deep, if you cross on the downstream side. I've taken the scooter across this one.
The Jeb Stuart ford is... a bit deeper, though I've only crossed it once (on the CX) and didn't do a full job of checking it out. I must have hit the deep part as my front wheel was submerged. After that I was paying more attention to keeping the bike upright and the revs up to pay attention to depth.
Do you know of any other water crossings besides these?