If you’re staying in Glenwood at an AirBnB or at the Glenwood Lake Park campground, there’s a nice way to get to the Archeological State Preserve on the other side of Highway 34 without crossing fast moving traffic. There’s a tunnel.
Here’s a link to the route: https://ridewithgps.com/routes/37523115
This route will take you from the Glenwood Lake Park to the Glenwood Archeological State Preserve through a tunnel under highway 34. You’ll need to go through the Glenwood Resource Center, a home for people with disabilities, so do be kind and careful as you ride through the center.
The road through the GRC will turn into a narrow street and then connect to a mowed path maintained by the Iowa Department of Resources. Take care going through the gates as the cattle guards are a bit wide, but an adult-sized bike tire should go over them just fine. Also, barn swallows like to roost in the tunnel, so be ready to say hi to some birds as you zip through. Sing them a song, they like that. 🙂