Indian Mounds regional park in St. Paul minnesota about 45 minutes after sunset.
This is the picture I wanted to enter last month for rivers and fjords but hadn't taken it yet.
If you go for a sunset picture I do suggest staying well after the sun has gone below the horizon. If there are other people up there taking pictures they go away within about 5 minutes of sun down and they miss the color change in the river. Also there are a lot of potheads up there but they keep to themselves and mostly just stay in their car.