Welcome to the I-29 Exit 77 (41st Street) Interchange and Environmental Study Project

The South Dakota Department of Transportation (SDDOT) in conjunction with the City of Sioux Falls, the Sioux Falls Metropolitan Planning Organization (MPO) and the Federal Highway Administration (FHWA) has contracted with HDR, Inc. to perform an interchange modification justification study for the I-29 Exit 77 interchange and conduct the associated environmental investigation.


New Documents Added!

November 27, 2017

The Interchange Modification Justification Report was recently approved by the Federal Highway Administration (FHWA). This report provides details about the traffic analysis conducted for the I-29/41st Street interchange. The report also includes the FHWA approval letter.

As a reminder, project documents can be found here.