Physics Question of the Day

This was a question on a physics test when I was in college over 50 years ago. I liked it so much; I have always remembered it.

You place a rowboat in a swimming pool and fill it with large rocks to the point where it is about to capsize. Then you mark the water level on the side of the pool. Then you remove all the rocks from the boat and throw them into the pool. All the rocks are now at the bottom of the pool. You mark the water level on the side of the pool again. Did the water level go up, down or stay the same.