Alternatives

Recommended Alternative

The EA evaluation was completed in September 2012, and resulted in a recommendation of the Improved Partial Cloverleaf Alternative.

Alternatives Evaluation Process

A tiered alternatives development and screening process was used to evaluate alternative elements moving forward into this NEPA process. See the Project Background page for more information.

This NEPA study included documentation of previously considered alternatives, re-evaluation of the reasonable alternatives from the Arapahoe Road Corridor Study and System Level Feasibility Study, and evaluation of newly suggested reasonable alternatives. Evaluation was based on the purpose and need for improvements and project objectives, and included investigation of traffic, community and environmental impacts.

Following the project’s first public meeting held in April 2010, the project team received a tremendous amount of comments and roadway improvement suggestions from community members and local agency representatives. In keeping with the requirements of NEPA, all reasonably feasible alternatives for the I-25/Arapahoe Road interchange were investigated.

Below is a list of alternatives evaluated in the EA project. More information describing these alternatives and related alternatives evaluation results was provided at the September 8, 2011 public meeting.

The graphic to the right illustrates the three level alternatives screening process (click to enlarge). At the conclusion of the Level 2 screening process in July 2011, the project consultant recommended one "action" alternative, the Improved Partial Cloverleaf without Costilla Crossing, and a "No action" alternative be moved into further detailed, Level 3 analysis and comparison in the Environmental Assessment report. See the July 2011 news release and the August 2011 news release for more information.

Interchange Alternatives Reconsidered from the Arapahoe Road Corridor Study and System Level Feasibility Study

Tight Urban Diamond
Directional Ramps
Tunnel
Diverging Diamond
Three Level Diamond

Suggested Alternative Locations for Supplemental Crossings of I-25

Peakview Crossing
Caley Crossing
Connection to Clinton Court
Connection to Costilla
Costilla to Briarwood
Costilla to Alton Way
South of Costilla to Alton Way
North of Easter to Alton Way:
Easter to Alton Way
North of Easter Lane to Alton Way
Easter Lane to Alton Way
Geddes to Alton Way

Arapahoe Crossing Alternatives

Three Level Construction Without Replacing Existing I-25 Bridge
Through Traffic in Covered Lower Level
Through Traffic in Open, Trenched Lower Level
Separated, Trenched Through Lanes on Outside and Local/Ramp Traffic on Middle Level

Interchange Design Options

No Action
Improved Partial Cloverleaf without Costilla Crossing
Improved Partial Cloverleaf with Costilla Crossing
Single Point Urban Interchange With Single Ramp-Metered On-Ramp
Single Point Urban Interchange With 2 Lane Collector/Distributor Road from Arapahoe to Orchard
Single Point Urban Interchange With Eastbound to Northbound Loop Ramp

Other Arterial Street, Intersection and Operational Improvements Suggested by Public

From Arapahoe LRT Station to Caley Avenue, to Boston/Clinton Street to Costilla Avenue
From Arapahoe LRT Station to Caley Avenue, to Boston Street, to Peakview Avenue, to Havana and Arapahoe Road
From Orchard Road to Havana Street to Arapahoe Road

Other Suggestions

Various Potential Arterial Improvements such as Auxiliary Lanes on Arapahoe and Approach Roads, Signal Coordination and Timing, Add Pedestrian Grade Separations
Personal Rapid Transit System Around Interchange Complex