Amends the Illinois Municipal Code. Provides that, on and after the effective date of the amendatory Act, a redevelopment project area and any amendment adding an additional area to any existing redevelopment project areas created under the Tax Increment Allocation Redevelopment Act of the Municipal Code may include areas within the Big Island River Conservancy District created under the River Conservancy Districts Act only if the municipality receives unanimous consent from both (1) the board of trustees of the Big Island River Conservancy District and (2) the joint review board created to review the proposed redevelopment project area and any proposed amendment of any existing redevelopment area. Amends the River Conservancy Districts Act to make conforming changes. Effective immediately.