December 8, 2002; July 29, 2010; July 6, 2011: Three views of northbound I-35 in northeast Hamilton County. This was the original junction with US 20, evident with the Pilot and older Boondocks truck stops at the interchange. Since the freeway west of I-35 was done much earlier than the route heading east, US 20 shared at least this portion of the interstate.
The first photo is the only on-site evidence of IA 928 (duplicated on the other signs). The road was unsigned otherwise. The second shows the same sign as it appeared in 2003-10, with the county road marked. That sign, possibly the biggest non-freeway-to-freeway BGS in Iowa, was replaced very early in the 2010s. Ellsworth is still in Iowa Falls — you have to follow old 20 — but for whatever reason it’s off the signs now. Iowa Falls is signed at US 20, so I guess this was a way of getting around the destination limit there. (But Iowa Falls was never signed in either direction at I-35 exit 147, where it’s a straight shot east. Go figure.)
By the way, the sign color doesn’t actually change. That is a result of photographing the spot with three different cameras, and also the time of day and season.