https://www.openstreetmap.org/user/FeetAndInches/traces/12116810

Here is a GPS trace that goes through the roundabout three times: thru westbound on Viking (on the inner lane), a left turn from Viking to Prairie, and a left turn from Prairie to Viking. Together, they trace out the entire inner circle. There are also outer lanes in the center circle (not traced) for thru traffic on Viking. I also left in the bumbling to turn around so that you can see a general idea of the GPS accuracy and align to the existing roads.

Let me know if you need more tracks; I can head back in a few days if you need more details.