Structure is in EVERY BODY OF WATER we fish. It can be VERY subtle where (this is an example) the rocks meet the water way, there will be somewhere in the water where they stop and the bottom is now the bottom. This is an edge, also structure. Any depth change from a flat to deeper water, a channel etc etc
Depending on where you are located, you can still find some spawning. I would go where they WERE spawning, and fish it BACK to the deeper surrounding water. You can also go on an edge fishing day (fishing every edge you find like where grass comes out and then stops, points where there are edges etc) and just edges, or you can even go topwater all day.