Simpson's Prairie is one of the Illinois parks in thicket's catalog. thicket is a field guide to the parks near you: it maps the ones you have never noticed, gives you a reason to actually go, and keeps a record of where you have been.
Where it is
Simpson's Prairie is in Carroll County, Illinois. Its approximate coordinates are 41.96720, -90.12087.
Check in at Simpson's Prairie
thicket verifies you are actually here by GPS when you check in, so a visit means you went. Checking in builds a streak, earns achievements, and fills in your map of the places you have been.