Construction on the complete I-225 Rail Line began in spring 2013.
The RTD Board approved a proposal from Kiewit Infrastructure Company in July 2012 to complete the full line and open it in 2016.
Construction on the segment of the project from Nine Mile to Iliff began spring 2012 as part of a joint contract with CDOT.
On Oct. 20, 2009, the RTD Board of Directors approved the final I-225 Environmental Evaluation (EE), initiating final design from Nine Mile to Iliff.
In 2005, RTD completed the 3 Corridors Scoping Study, which furthered analysis of the I-225 Rail Line.
In 2001, RTD completed the I-225 Major Investment Study, which analyzed Parker Road to Interstate 70.