It crosses the Cedar River about 1.5 miles (2.4 km) before it intersects with Edgewood Road NE at a single-point urban interchange.

East of the volleyball interchange, the C-D lanes of Iowa 100 intersect Center Point Road NE before rejoining the mainline at the end of the highway.

[2] Continuing east, Iowa 100 passes the Collins Aerospace complex on the north and the studios for KGAN-TV on the south.

[5] Envisioned in the 1960s as a bypass of Marion, the route extension served as a development corridor for the city by providing access to its southern limits.

The Linn County Conservation Board noted environmental concerns in areas such as the Rock Island Forest Preserve.