The Prairie Parkway is a transportation project by the Illinois Department of Transportation (IDOT) to connect Interstate 80 to Interstate 88 in the outer western and southwestern suburbs of Chicago, Illinois.
Corridor protection 
A legal challenge to the state's Corridor Protection Act for the Prairie Parkway was unanimously rejected by the Illinois Supreme Court. This decision was later appealed to the U.S. Supreme Court, which refused to hear the case.
On November 28, 2007, IDOT announced a revised Corridor Protection Map was recorded that superseded the original map. The new Corridor Protection Map follows the B5 freeway corridor.
Preliminary engineering study 
A study was started in 2003 to examine transportation issues and possible solutions in roughly the same area as the corridor.
A report within the study indicated that, by the year 2030, there would be significant population growth in the study area and most of the area's roads would be congested as a result. Three counties in the study area - Will, Kendall and Kane - were among the 100 fastest growing counties in the U.S. from 2000 to 2004. As a possible solution to the area's traffic problems, a number of alternatives were considered, including widening existing roads, new freeways, traffic management techniques, and transit extensions.
In August 2005 President Bush signed the SAFETEA-LU federal transportation bill, which included $207 million for construction of the Prairie Parkway. The strongest supporter of that provision was House Speaker Dennis Hastert, who owned real estate in the area affected by the parkway. The SAFETEA-LU bill was supported by all 19 members of Illinois' congressional delegation as well as the state's U.S. Senators, Dick Durbin and Barack Obama.
In October 2005 IDOT presented three options for further study:
1. A "no build" alternative consisting of planned improvements to IL 47 and WiKaDuKe Trail independent of building a new Prairie Parkway freeway.
2. A "build" alternative consisting of the 34-mile (55 km) B2 freeway corridor paralleling IL 47 to the west, connecting to I-88 northeast of Kaneville and connecting to I-80 west of Morris, plus upgrading a 12-mile (19 km) segment of IL 47 from Caton Farm Road to Morris.
3. A "build" alternative consisting of the 37-mile (60 km) B5 freeway corridor, connecting to I-88 northeast of Kaneville, diverting to the east crossing IL 47 south of Yorkville, and connecting to I-80 west of Minooka, plus upgrading a 12-mile (19 km) segment of IL 47 from Caton Farm Road to Morris.
Environmental Impact Statement 
In November 2006, the Draft Environmental Impact Statement for the project was released.
In February 2008, the Final Environmental Impact Statement for the project was released.
The federal Record of Decision approving the project was signed on September 19, 2008. Friends of the Fox River and Citizens Against the Sprawlway filed a lawsuit on March 25, 2009 in the U.S. District Court for the Northern District of Illinois in Chicago against the Federal Highway Administration (FHWA) for violating Federal law in how it approved the Prairie Parkway project.
Preferred alternative chosen 
On June 1, 2007, the Illinois Department of Transportation announced the selection of B5 as the final route, which will run about 4 miles (6.4 km) west of IL 47 and then turn southeast and terminate on I-80 near Minooka, Illinois. IL 47 would also be widened from Caton Farm Road to I-80.
Construction of the segment from U.S. Route 30 to Illinois Route 71 was previously programmed by IDOT.
However, IDOT's FY 2010-2015 Proposed Highway Improvement Plan released in 2009 included funds for preliminary engineering and land acquisition only.
Voters in five townships oppose Prairie Parkway in advisory referenda 
In April 2007 voters in two Kane County townships, Kaneville and Big Rock, overwhelmingly opposed the Prairie Parkway in advisory referenda. In February 2008 voters in three Kendall County townships, Fox, Lisbon and Seward, followed suit.
Tollway proposal 
Construction funding dropped from state highway plans 
In April 2009, Congressman Bill Foster (D-14th) has indicated he will try to move some of the Prairie Parkway funding to other projects. In May 2009 the Illinois Department of Transportation dropped all construction funding for the Prairie Parkway from its 2010-2015 Highway Improvement Program, the funding blueprint for future highway projects. IDOT Secretary Gary Hannig cited litigation and a lack of local consensus as the reason construction funding was removed from the plan. The previous Highway Improvement Program (2009-2014) allocated $207 million for engineering, land acquisition, and construction.
However, $0.9 million for "P.E. Soils" and $1.5 million for "Land Acquisition" was included in the IDOT 2010-2015 program for the Prairie Parkway.
Renewed push for Prairie Parkway from area officials 
A group of area governmental and labor officials including Kane County board chairwoman Karen McConnaughay, Kendall County board chairwoman Anne Vickery, Grundy County board chairman Frank Halpin, Yorkville mayor Valerie Burd, Plano mayor Bob Hausler, Sugar Grove village president Sean Michels, Chicago AFL-CIO President Dennis Gannon and others met with IL Governor Pat Quinn's staff to renew the local push to complete the Prairie Parkway project. Referring to Rep. Foster's attempt to de-fund the project, Vickery stated "Mr. Foster seems to be driven by a very small faction of people who are against the Parkway. There is a much broader group of people who are interested in this transportation corridor."
Future connectivity with other projects 
An outer loop highway around the perimeter of the Chicago area has been in conceptual planning for over 100 years. The 1909 "Plan of Chicago", authored by Daniel Burnham and Edward Bennett, included an "outer encircling highway" with a western portion roughly approximating the Prairie Parkway route. The Illiana Expressway, which is currently in planning by the states of Indiana and Illinois, would connect Interstate 55 to Interstate 65 and its routing would roughly approximate the southern portion of the outer encircling highway concept. A short connection between the Prairie Parkway and Illiana would result in a continuous connecting route of approximately 100 miles from Interstate 88 to Interstate 65 around the western and southern suburbs of Chicago. All three projects (Prairie Parkway, Illiana, and an I-55 to I-80 connector) are included in Chicago Metropolitan Agency for Planning's Go to 2040 regional plan, although none of them are listed as priority projects for this planning period.
Federal Approval of Record of Decision Rescinded 
On August 22, 2012, the Federal Highway Administration rescinded its approval of the Record of Decision. The 2007 Corridor Protection remained in place.
Future exits 
- Interstate 80
- U.S. Route 52
- Illinois Route 47
- Illinois Route 71
- U.S. Route 34
- U.S. Route 30
- Interstate 88
- "Strike three for Prairie Parkway opponents", Oswego Ledger-Sentinel, June 8, 2006
- http://www.sprawlway.org/fhwalawsuit.pdf Retrieved 2009-05-06.
- "Parkway Headed to Minooka", Joliet Herald News, page A1, 2007-06-02
-  IDOT FY 2010-2015 Proposed Highway Improvement Plan]
- "Prairie Parkway scorned by voters', Aurora Beacon-News, Feb. 6, 2008
- "Kendall's Priority? Boosting ailing economy", Aurora Beacon News, January 17, 2009]
- "Prairie Parkway project may be stalled", Ottawa Daily Times, April 20, 2009]
- "IDOT's road plan focuses on maintaining status quo", Daily Herald, May 20, 2009
- "Officials make renewed push for Parkway project", Kendall County Record, November 5, 2009
- Burnham, Daniel and Bennet, Edward, "Plan of Chicago", Commercial Club of Chicago, 1909
- "Regional Mobility: Go to 2040 Regional Plan", Chicago Metropolitan Agency for Planning, October 13, 2010
- Citizens Against the Sprawlway
- Corridor Protection Study
- Prairie Parkway Preliminary Engineering Study
- Prairie Parkway Draft EIS
- Prairie Parkway Final EIS
- Prairie Parkway Record of Decision
- End of the Road for Prairie Parkway