Yes, but keep in mind reservoirs are generally 10's if not 100+ feet deep. That's a lot of weight per unit area. The flooding in New Madrid is only going to be a few feet deep and I'm probably not wrong to say spread over a much larger area as well.

Although water can be involved in 'lubricating' faults through pore pressure, we're talking about water on the surface of the Earth. The NM faults I believe are kilometers deep if I'm not mistaken. Further, they are buried in probably hundreds of feet of sediment. The water isn't going to percolate down very easily, if at all - at least not in a few lifetimes.

I think some folks (scaremongers especially) don't appreciate the physical nor temporal scale of geology and geologic events.

Brian