By 1977, an interchange directly west of Redwood Road at I-215 was being built and the rest of the highway to Magna was given a median in preparation for freeway construction to 5600 West (SR-172). This construction concluded by 1986, with interchanges at 3200 West, Bangerter Highway (SR-154, then solely 4000 West) and 5600 West as a result. Beginning in April 1997 and concluding in July 2001, as part of a larger reconstruction project for I-15, SR-201 was rebuilt from 900 West to I-15/I-80, including the colloquial "Spaghetti Bowl" interchange. As a result, SR-201 was left in two discontinuous pieces; to connect from the surface portion of SR-201 to the freeway, one must now take an on-ramp. From 2004 to 2006, the freeway from 900 West to I-215 was widened and repaved, the Redwood Road interchange being redone as well. In 2009, the freeway from Bangerter Highway to 5600 West was widened to three lanes in each direction and the road between SR-202 and I-80 was widened to four lanes—the latter project eliminated the final two-lane section of SR-201.
