Corridor alternatives — concept alternatives
The I-74 project team has completed an evaluation of transportation problems and deficiencies along I-74 and has developed four concept alternatives for improving travel through the corridor (see Key Map). The concept alternatives include the following improvements to I-74 and connecting arterial roadways.
- I-74 would be reconstructed and widened to six lanes (three lanes in each direction) from south of the 23rd Avenue interchange in Illinois to the U.S. 6 interchange in Iowa. Also, additional auxiliary lanes would be provided between 23rd Avenue and Seventh Avenue (northbound and southbound), Sixth Avenue and Middle Road (northbound), and Sixth Avenue and Grant Street (southbound). North of U.S. 6, the existing four-lane facility (two lanes in each direction) would be maintained.
- Existing bridges, including the Mississippi River structures, would be reconstructed and widened to match the proposed roadway improvements. Existing overhead structures would be modified, as appropriate, to accommodate the proposed widening along I-74.
- I-74 would be realigned in the vicinity of the Mississippi River. Three alignment alternatives have been developed for this area.
- Existing interchanges at 23rd Avenue, Seventh Avenue, River Drive, State Street/Grant Street, Kimberly Road, Middle Road, U.S. 6 (Spruce Hills Road/Kimberly Road), and 53rd Street would be improved to update the design and enhance access to adjacent communities. Multiple interchange improvement alternatives have been developed and are illustrated on the graphics at the end of this section.
- Connecting arterial roadways adjacent to the I-74 interchanges would be widened and improved to enhance travel flow.
Concept alternatives were developed through a series of workshops with the Iowa and Illinois departments of Transportation, Federal Highway Administration and involved municipalities. During these workshops, possible river crossing location options, interchange options and lane requirements for the roadway were identified and explored. Viable options for the I-74 corridor were then combined to create the concept alternatives (See Development of Concept Alternatives for an illustration).
As you review the concept alternatives, please note the following issues.
- The alternatives represent only the approximate location and configuration of roadway improvement alternatives. In the next steps of this study, the proposed roadway improvements will be refined and adjusted.
- The interchange and alignment alternatives have been combined for ease of presentation to illustrate four complete alternatives. However, the elements (i.e., interchange and alignment options) of the concept alternatives are interchangeable. As an example, the river crossing location of Alternative I could be combined with the interchanges in downtown Moline and Bettendorf identified in Alternative II.
- A final decision regarding the proposed corridor sizing has not been made at this stage of project development. Rather, the proposed corridor sizing was used as the basis of analysis of potential environmental consequences.
Following are nine graphics depicting the concept alternatives. The project study area has been split into the following four segments to illustrate the proposed improvement alternatives under consideration (moving from 23rd Avenue in Illinois to the north along I-74).
- South segment (south of 23rd Avenue to south of 19th Avenue):
- Central segment (south of 19th Avenue to approximately Lincoln Road.): Alternatives I, II, III, and IV
- Near north segment (Lincoln Road. to north of U.S. 6 interchange): Alternatives I and II
- Far north segment (north of U.S. 6 interchange to north of the 53rd Street interchange): Alternatives I and II