Well, possibly this comes with an asterisk, but Jose Luis Barbosa ran for Lane in 1986 while he lived in Eugene and he got under 1:47 a few times. Also, Chris Katon ran for CC Spokane in 1992 and a couple years later ran 3:59.19 competing unattached in Eugene.
Jim Howarth went to Lane CC before his time as an Oregon Duck. Known to Coach Bill Dellinger as "the Grants Pass Flash" and "our 700-meter runner," Ho as a post-collegian ran 3:59.75 to become U.S. sub-4:00 miler No. 202... er... 201... no, 203... 202!
He was coached by Alberto Salazar... and may have worn corked spikes that day. (kidding)