Iowa Route 8 is a short east-west route northwest of Cedar Rapids and south of Waterloo. After US Route 218 drops southerly out of Waterloo, it bends to the east toward Vinton; at this bend, Iowa Route 8 is spawned to head west. After US Route 63 drops southerly out of Waterloo, at a point farther west than US Route 218, it meets a bend to the west. At this bend, Iowa Route 8 meets its western terminus. On maps, you might imagine the profile image of a ten-gallon hat with Waterloo at the top; the left side of the brim and the left edge are formed by US Route 63, and the east side of the brim and the east edge comprise US Route 218's contribution. The bottom of the hat is Iowa Route 8 (and the top horizontal line is US Route 20). The latitudinal corridor started by Iowa Route 8 continues west as a jog in US Route 63, and then further as Iowa Route 96; for this reason, I don't know why Iowa Routes 8 and 96 don't share the same number. That western end at US Route 63, by the way, is in the town of Traer.
My photo for Iowa Route 8 is the northbound junction marker seen along US Route 218, seen by travelers approaching Iowa Route 8's eastern end. This is west of Vinton, Iowa. The photo here showing the crisp, clean "8" was taken in May 2022 as part of the final trip to Iowa. That final trip focused on Iowa City, Cedar Rapids, and north-central Iowa.