June 3, 2014: First Street in Cedar Falls, presently IA 57, is the original route of US 20 through that city. This is at the intersection with Franklin/Center streets, old US 218.
I have plugged Bryan Farr’s work to promote the original route of US 20 occasionally for the last few years (wait, is five and a half still “a few”?). He has had great success in getting city and county governments to sign on with his vision, occasional state-level kiboshes notwithstanding.
Last week, the Black Hawk County supervisors unanimously voted to support Farr’s efforts and mark the original route of 20 through the county. That route is the one shown on my Waterloo-Cedar Falls Highway Chronology page, although there will be at least one minor deviance to account for the present day.