My watermelon seeds recommend mounded sandy soil. Can I take it from a nearby creek?

Hi everyone!

I ordered some sugar baby watermelon seeds and they're saying that sandy, well-drained soil is good for them.

There's a creek bed a few lots down that mostly flows though woodland, with bits of pasture and some housing developments. It was dredged about 4 years ago to put in a culvert and in the meantime has had a lot of sandy soil wash in. Would there be any drawbacks to just scooping a wheelbarrow load or two and just bringing it to my yard? The vegetation that's been growing it in looks healthy. The native dirt is mostly heavy clay, with small amounts of compost added in some places. I'm in the process of mulching the whole yard to build soil...just trying to make sure I don't screw anything up with this experiment.

Sugar baby watermelons are one of our favorite plants to grown.

We don't have sandy soil to grow them in.

If I were in your place I would just plant them and see what happens.