"He lifted me out of the slimy pit, out of the mud and mire. He set my feet on a rock and gave me a firm place to stand" Ps 40:2
"There is a place near me where you may stand on a rock." Ex 33:21
According to Websters, sandbars are formed by the actions of waves or currents.
In our lives, that's just when we need them. AND, I think that's when they are formed for us, too. As we experience the waves and currents of life, if we don't have something to stand on we will sink. Most people seek God when something is wrong in their lives. As they find Him, their sandbar starts to form. To most of us this is called faith. Faith is often built thru trials - currents - waves. It energizes us like the girl who was screaming to be able to stand after swimming through dark waters. But the main tie in from the verses is that it's God who does this - not us. He lifts us out and gives us something to stand on - our faith comes in when we stop swimming and put our feet down and notice it!