The Red Hill Valley Parkway (RHVP) is a municipal expressway in the Canadian city of Hamilton, Ontario.

The C$245 million freeway was built through the Red Hill Valley by the City of Hamilton after a decades-long battle with opponents.

On July 26, 2009, sections of the expressway at the QEW were closed due to flooding of the Red Hill Creek after a thunderstorm.

[3] On July 7, 2010, sections of the expressway at Barton Street were closed due to flooding of the Red Hill Creek after a thunderstorm.

Past the CPR rail lines, the Creek diverges west into Rosedale Park, while the expressway hugs the east side of the valley.

After crossing under the Pritchard Road overpass (that serves as the demarcation line) the route continues as the Lincoln Alexander.

Against the wishes of those agencies, and a group called "Save the Valley", the board approved the project 2–1, with the OEAB representative dissenting, in October 1985.

[5] Construction began in 1990, but was stopped by the election of the Ontario New Democratic Party (NDP) government of Bob Rae.

Crombie produced a plan without an expressway, instead proposing the construction and expansion of arterial roads on either side of the valley.

Environment Canada initiated a full environmental review, which Hamilton opposed, launching a lawsuit, arguing that the project had already been approved.

The lawsuit alleged "the defendants abused their public office by engaging in targeted malice towards the City's completion of the Expressway" and utilized environmental assessment "in an unprecedented, illegal and unconstitutional manner in order to achieve that objective.

"[7] In 2008, after rejecting an offer to settle by the Government of Canada, Hamilton Council voted 8–6 to continue the lawsuit and remove a $450,000 spending cap on the suit.

[8] In November 2009, Hamilton Council voted to continue the lawsuit, and defeated a motion to make the legal costs public.

[9] Opponents criticized the expected environmental damage of the project and questioned the economic viability of highway building in the face of declining oil production.

Opponents asserted that two groups would be the chief beneficiaries of the expressway: long-distance truckers travelling from Detroit to Buffalo, and land developers on the Hamilton Mountain.

Supporters had also argued that the Red Hill Valley expressway was the only viable alternative to the congested provincial freeways of Highway 403 (whose segment between the Lincoln Alexander Parkway and QEW, also known as the Chedoke Expressway, has limited expansion capacity due to its older design as well as its winding and hilly nature) and the QEW (including the Burlington Skyway Bridge).

The 1990s reconstruction/reconfiguration of the Freeman Interchange (QEW-403-407) from its original semi-directional T configuration to incorporate the extension of Highway 407 had resulted in a lowered capacity of the ramps handling QEW Toronto-bound to Highway 403 Brantford-bound traffic, suggesting that the province was relying upon the future Red Hill Valley expressway to divert traffic away from the Freeman Interchange.

Proponents also asserted that, despite the introduction of the expressway, care would be taken to ensure that the Red Hill Valley would be preserved and environmentally improved from its current situation.

Hamilton removed a toxic landfill leaking into the Creek, and made stream naturalization part of the construction project plan.

[13] A Hamilton municipal election was held in 2003, with pro-expressway candidate Larry Di Ianni winning the mayorship over expressway opponent David Christopherson.