The three alignments considered are seen in the figure above. These include a red, yellow, and blue alignment. These alignments were considered using a decision matrix with the criteria listed to the left. The red alignment was chosen as the final roadway alignment.
Figure 1, Potential Alignments
Table 1, Alignment Criteria
Table 2, Alignment Decision Matrix
Roadway Cross-Section Design
A typical cross-section of JWP Boulevard is shown below. The road features two 6' sidewalks, two 4.5' bike lanes, 2 12' travel lanes, with one 15' median.
Figure 2, Roadway Cross-Section
Intersection Design
Two intersections were designed for the JWP East extension. This includes a redesign of the current signalized Butler Ave and Fourth St intersection, and a design of a stop-controlled intersection at Herold Ranch Rd. The design of these intersections was determined from a preliminary traffic assessment that was conducted. For Butler & JWP Blvd intersection the signal phasing was determined since the intersection is signalized. For Herold Ranch & JWP Blvd the intersection sight distance was determined since the intersection is stop-controlled.
Butler Ave and JWP Blvd Intersection
Figure 3, Butler & JWP Intersection Design
Figure 4, Butler & JWP Signal Phasing
Herold Ranch Rd and JWP Blvd Intersection
Figure 5, Harold Ranch & JWP Intersection Design
Figure 6, Harold Ranch & JWP Sight Distance
Hydraulic/Hydrologic Structures Design
Two water crossings were designed for JWP Boulevard. One crossing at Rio de Flag and another at the Pine Canyon Wash, respectively. Plan and profile views are found below of each culvert.
Figure 7, Rio de Flag Culvert Plan & Profile
Figure 8, Pine Canyon Wash Culvert Plan & Profile
Decision matrices were used to determine the type of culvert to be used for these water crossings. The criteria used as well as the decision matrices used for each crossing are found below.
Table 3, Hydraulic Structure Criteria
Table 4, Pine Canyon Wash Decision Matrix
Table 5, Rio de Flag Decision Matrix
Water Crossing Map
Figure 9, Water Crossing Map
Wildlife Considerations Design
Wildlife considerations were designed for JWP Boulevard. Due to the area being slated for future development, a less permanent option of a nighttime speed limit was selected. This speed limit of 35 miles per hour occurs in the middle of the alignment where the animal crossings are highest. This speed limit will be active from sunset to sunrise.
Figure 10, Wildlife Mitigation
Construction Cost Estimate
A cost estimate was developed for the project. This included major costs associated with tree removal, earthwork, roadway materials, signing and striping, landscaping, and drainage.
Table 6, Construction Cost Estimate
Project Impacts
Social Impacts
Positive Impacts
More direct east-west travel path in Flagstaff.
More land for development (i.e. increased housing, park & rec areas, etc.).
Negative Impacts
Temporary disruption to FUTS and Arizona Trail.
Noise & dust with construction.
Loss of land for parcel owners
Economic Impacts
Positive Impacts
Opens land up for development including new urban centers (i.e. restaurants, shopping centers, increased real estate).
Decreased travel time within Flagstaff, increased productivity.
Negative Impacts
Large upfront cost associated with cut/fill and construction.
Large cost to taxpayers of Flagstaff.
Environmental Impact
Positive Impacts
New road helps to alleviate traffic and congestion, which reduces pollution from traffic.
Negative Impacts
Land alterations associated with urbanization and roadway construction (i.e. removal of trees, loss of wildilife habitat).
