Weather was decent (72°F), humidity 55%, slight smoke from the California situation, but no noticeable impediment to my running. At mile 9 (going counterclockwise) there's a 90ft hill, and at 10 a 60ft hill. Both are somewhat challenging. If I run this again, I'll try going clockwise. Saw only 5 people on the whole loop, and no vehicles.
It's worth checking out the area to memorize all the turns; few are marked, and cardinal direction becomes ambiguous with dense forest surrounding (and particularly with the smoke). I hope more people get out here to run this course, as it's a worthy route. Thanks to Iain Ridgeway for setting it up.