Many people generally ride Busch in a counter-clockwise (CCW) direction working the hiking/biking trail into the loop. Some of the gravel roads are just out and backs so you just have to explore. It’s a good place to ride when singletrack trails are too wet.
The Missouri Department of Conservation (MDC) is currently working with Great Rivers Greenway to get a trail in place that will connect Research Park to the Hamburg Trail, which will make a great wet weather route by creating a big loop using the Hamburg, KATY and Research Park trails.
Below is a map that shows the Busch roads open to bikes (the service roads are now open to bikes) and the Busch Hiking/Biking Trail. The map also shows the lake numbers, which is helpful when trying to navigate the maze of roads out here. There are many options to connect loops and create your own route. With 25+ miles of gravel roads and the 3.2 mile trail you can really create a large and lengthy loop.
The area is open until 10 pm, so it’s a good place to ride at night.