Iowa Route 330 is the designation applied to both a four-lane highway connecting Marshalltown and Des Moines, and a minor two-lane surface road flanking the northern and western sides of Marshalltown.  The southwestern end of Iowa Route 330 is at Interstate 80 just northeast of Des Moines, in Altoona.  The interchange with Interstate 80 marking the southern endpoint is also a point where US Route 6 joins the Interstate from the southwest; the roadway carrying Iowa Route 330's southwestern extent is a continuation of the road carrying US Route 6.  Anyway, from this interchange, Iowa Route 330 proceeds northeasterly toward Marshalltown as a high-speed four-lane divided highway.  US Route 65 is concurrent for this first section.  After about fifteen miles, US Route 65 splits to head due north, independently of Iowa Route 330, which continues northeast.  Just west of Marshalltown, Iowa Route 330 meets an interchange with the limited-access US Route 30, which is meant to carry traffic the remaining few miles to Marshalltown. It is at this point that Iowa Route 330 transitions to a minor two-lane rural highway, proceeding north to Albion and east to Iowa Route 14. The intersection with Iowa Route 14 north of Marshalltown is the final endpoint of Iowa Route 330.

My photo of Iowa Route 330 shows a sign assembly marking the southwestern beginning of the highway.  This signpost stands right along the south side of the underpass comprising part of the interchange with Interstate 80.  At this interchange US Route 6 comes from the southwest and joins Interstate 80 east, and US Route 65 comes from the southwest and continues northeast on Iowa Route 330.  This photo was taken in September 2019 as I was returning from my trip across northern Iowa.  (The traversing of northern Iowa was the outbound route away from my home.)
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