Couple things you might want to look at.
How each determine their rankings and what goes into them. Also US News does not factor/value other colleges like smaller or private colleges and schools that can outperform some major schools in some aspects and majors.
www.collegefactual.com
Also of note. US News weighs 20% of their list on "Expert Opinion" , Also on "Alumni Giving" Also US News does NOT factor in Post graduate degrees or curriculum in any way, Nor factors in quality of Major, nor post graduate earnings while the other does.
So any and all Masters, PHDs etc are all not factored in the US News ratings. As well as research.
In research Oregon ranks 154th, Iowa State ranks 71st. Of note since 2020, when this list was last updated, ISU has almost doubled its research to $601M, which would put ISU in 47th if all others stay the same. (Mich St, is in 38th with $713M)
www.news.iastate.edu
Finally a quick look at the majors available at Oregon, one has to wonder not only How they maintain an AAU status but also how US News ranks them so High. I guess Being great at bad degrees is better than being great at Great Degrees in their world.
admissions.uoregon.edu
www.iastate.edu
AAU weighs heavily on Medical and Engineering Research funding. Oregon has neither. Oregon has Miniscule research funding Compared to the rest of AAU. Yet we were not able to maintain, but somehow they are.
US news is not a great metric to go by. They are a magazine, they sell subscriptions, and advertising, and go by Opinions and biases, who gives money, but also they leave out a large amount of the data when calculating the best schools.