OUCH! Did you drain the engine oil yet? You probably at the very least will need to drain all your fluids (Engine oil, Diffs and tranny) to be sure no water is mixed in. I would do that FIRST BEFORE TRYING TO START ENGINE!!! Other than that, check your fuses, etc. You may have fried some electrical stuff.
I checked the oil, it looks OK, Tranny fluid looks Ok too .... It won't turn over at all. It makes a "clunk" noise like the starter doesn't have enouigh umph to push the cylinders over, I'm thinkin the cylinders might be full of fluid which won't compress, which in turn won't let the engine turn over. Waiting for the insurance adjuster to come out and look at it? Should I pull all the plugs and turn it over?
I did that to an ATV last weekend and it was water locked!!!! Pulled the spark plug and got it running In about 20mins. Changed the oil and all the fluids!!!! Same thing with your truck. The only thing is..........How long did you tried to start It!!!! Thats going to be the different as to how bad it will be!!!! My be bent!!!!
All I did was take off the air cleaner and see the lake sitting in the box on top of the throttle body, I figured it was time for the Dodge dealer to look at it at that point ... I tried to start it probaly 5 times in the last 2 days, did the same thing each time, "clunk" is the only way I can describe the sound it made. Adjuster is coming out in the morning to look at it, then it's off to the dealer .... Might as well have the pros look at it ... I'll let ya know how it turns out .....