Southwest Arterial over US 61 and Granger Creek

Southwest Arterial over US 61 and Granger Creek


WHKS prepared final construction plans and specifications for a 560′ x 55′ with a 14′-1½ trail continuous welded steel girder bridge. The structure includes two aesthetic arch trusses spanning 201′-6 in the center span over US 151/61 and spans Granger Creek, providing one of two gateway structures for the Southwest Arterial.

The four-span bridge with stub abutments is founded on H-piles and multi-column piers on spread footing on rock. The project included aesthetic barrier rails, concrete post-coloring, and aesthetic “risers” on the piers. 

The plans were prepared in accordance with Iowa Department of Transportation Standards.


  • Final bridge and roadway approach design
  • Type, Size, and Location plans
  • Construction administration


The Southwest Arterial project is a 6.1-mile, four lane, divided freeway connecting US 20 and US 61/151. The new roadway improves safety conditions and mobility by reducing congestion, encourages commerce on the local transportation network, and provides opportunities for new development along the corridor. The majestic gateway structures offer a grand welcome to visitors to Dubuque.