Martin Savidge joins us now from the flood zone, north of Saint Louis.

Martin, the authorities are bracing themselves for another breach.

--Yeah, Anderson. This is just outside West Alton. This area has literally been all day long kind of focus of the battle with the flood water here. It had 2 breaches in the last 24 hours, now it apprears for a third breach, and this one could be the most serious of all. The Mississippi river is just beyond here, you might see that smoke stack in the background there. If it gives away, and there is real fear there is a slide occuring on one of the levees there.

If that happens, all that water is goona come right this way. 94 here, the state high way, it is the main way out, they have to keep this roadway open. Because for a lot of people, it's gonna be the way they get out of the water's way. They're erecting right now a store kind of levee veri quickly, to try to prevent that from happening. In essence, it's gonna be a watery alomo. They have to hold it. If they don't, there will be in serious touble and the power planet would be in trouble, as well, Anderson.

--Are conditions supposed to get worse before it gets better in West Alton?

--Yeah, because the next thing is gonna happen. Even though the water is going down, the wheather is going to move in. Tomorrow, more rain is anticipated. What's gonna be crucial is how much rain, where would that rain fall, expecially in the north, and is there going to be wind as well. Because you see the water is at the top of a lot of these levees, if you get the wind, if you get the wave action, it's gonna have more kind of corrosive effect. If it erode even more and weaken the structures that right now are already showing the signs of weakness. So, it is really gonna be a time when people are gonna watch the water, and watch the sky.

The mystory related to the Boston Marathon bombing. Down the last 24 hours, we have been trying to find the hero who, Erika Brannock, says so desperatedly helped save her life. We told you about Erika last night. She left Boston's Beth Israel Deacon's Medical Center yesterday, the last of the Boston Marathon bombing victims to go home. She had 11 surgeries, she still has a long recovery ahead. Randi Kaye spent the day with Erika yeasterday. And in a report last night, she decribed what happened to Erika in this critical minutes right after the bomber went off. A good samaritan appeared at her side. Listen.

Erika is also screaming for help. The lower part of her left leg had been blown off, and her right leg was broken.

--I had a conversation in my head with God, and I told Him I wasn't ready to go. And it was almost instantaneously she heard my thoughts. This woman kind of crawled over to me, and she grabed my hand. She heard me screaming for help, and she said my name is Jone from California, I'm gonna let you go. And she stayed with me for the whole time.

Jone used her belt as a tourniquet on Erika's leg. Erika never got Jone's last name, or contact, but swears the woman in the yellow jacket with brown hair saved her life.

She desperatedly wants to find her and thank her.

--Yeah, that's her.

We showed her a picture of Jone helping her from the Boston Globe.

--That's Jone right there, and then she's holding my hand right there, and this is my right leg.