Somewhere in this area, around milepoint 165.4, is a wildlife overpass corridor in construction. The largest around.
https://www.codot.gov/projects/i25greenlandwildlifeoverpass

Here, the stream labeled "North Fork Republican River" flows into the Arikaree River, which then flows northeast into the real named "North Fork Republican River." This seems hydrologically implausible, but I don't have a source to confirm the actual name, whether this is a mislabeling or a special case. Leaving this note for review by local experts or those with access to better maps.

Oak Circle is not a continuous road at this point. I was there yesterday. There is a pedestrian connection there, but cars can't pass, it isn't paved, and the ground is uneven. The official boulder map at https://www-static.bouldercolorado.gov/docs/map-bike-pedestrian-routes-1-201407111617.pdf is actually wrong, I'll tell them also.