At 21:25:02 CDST the ISS reached an altitude of 59° and a magnitude of -3.8 over Bethany, Oklahoma.
I walked down the block to the local elementary school to use the playground for an unobstructed view of the sky. Max azimuth was at 21:25:02 at 59 degrees above the horizon. Track was from SSW to ENE. Once I could pick out the ISS from the haze by the sunset, I could track the ISS all the way across the sky until it went behind a garage across the street.
OKC weather conditions: 88°F, 51% humidity, wind 15 mph. Not a cloud in the sky.
The ISS took 1 minute and 43 seconds, covering 515 miles to get to Wentzville, arriving at 21:26:45 CDST. It had an azimuth of 51° and a magnitude of -2.8 over Wentzville.