Subsequent bridge replacements were made along I-225 at Sand Creek by August 1990 and over Smith Road and the Union Pacific Railroad as part of a reconstruction of the freeway between 30th Avenue and Smith Road. That $6.8 million project ran from October 1992 to August 1994. $4 million in work also underway from March to October 1994, reconstructed the interchange with I-70 and widened I-225 southward to Smith Road.1
Further work at the north end added a 1,967 foot long flyover from I-70 west to I-225 south at the cost of $18.2 million. The new ramp opened to traffic on April 23, 1994. $4 million construction from Fall 1994 to April 1995 also reconstructed ramps from I-70 east to I-225 south and from I-225 north to i-70 east. Work on the flyover from I-225 north to I-70 west followed from September 1997 to the summer of 1998.1
Interstate 225 was further expanded to six lanes south from Colfax Avenue to Sand Creek from February 1996 to November 1997, and between 6th Avenue and Colfax Avenue by December 1997. A new interchange for Alameda Avenue (Exit 8) was completed in 2002, while construction on a flyover from SH 83 (Parker Road) north to I-225 south started in September 2000.1
The southernmost portion of Interstate 225 was incorporated in the greater Denver “T-REX” construction project. The $1.72 billion project expanded both Interstates 25 and 225 with additional lanes and light rail corridors. Work along I-225 widened the freeway to six lanes from I-25 north to SH 83 and reconstructed the interchange with Interstate 25.2 The overall six-year project was completed by late 2006.