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SR 77 Project Summary:

State Route 77 is a north-south highway stretching from its northern terminus at the boundary of the Navajo Nation north of Holbrook to its junction with Interstate 10 in Tucson.  The purpose of this project is to improve safety on SR 77 from approximately Milepost 145.2 to 147.3, which is approximately 26 miles south of Globe and 7 miles north of Winkelman. This will be accomplished by increasing the shoulder width from virtually zero throughout much of the project to 8-ft on each side of the highway and by providing rockfall containment in areas prone to falling debris.

The following was the scope of work as noted in the ADOT Project Assessment (PA) prepared in December, 2002 (items in italics are being evaluated by the design team):

§   Symmetrically widen the existing pavement to a 40-ft roadway to include an 8-ft shoulder on each side. Saw cut a minimum of 1-ft pavement on each side.

§   Overlay full width of roadway with 2-inches of Asphaltic Concrete (AC) and apply ½-inch Asphaltic Concrete Friction Course (ACFC) over 25-ft width of roadway for the entire length of the project.

§   Construct a 15-ft wide ditch for rockfall containment along the west side of SR 77 per ADOT Std. C‑02.20. In addition to the ditch, rockfall fencing will be installed from MP 145.62 to MP 145.75 and MP 145.85 to MP 145.88. Areas where fencing is placed shall include 5-ft of pavement widening and guardrail. Provide a minimum 12-ft opening at fence termini for maintenance equipment access.

§   Evaluate clearing existing berms and rock outcroppings to improve sight distance.

§   Due to the widening, retaining walls will be required along the east side of the roadway where the Gila River may be affected. For the purpose of this assessment, the limits of the construction for the retaining walls are from MP 145.25 to MP 146.13.

§    Design speed for the roadway shall be 55 mph per the ADOT Roadway Design Guideline for a rural non-divided highway with rolling terrain.

§     Remove 6,138 linear feet of existing guardrail. Remove 21 BCT's. Install 9,000 linear feet of new guardrail, with approved end terminals, along rockfall fence locations and fill slopes.

§      The roadway will be marked with thermoplastic striping by the contractor. Install raised pavement markers, single white delineators and ground-in rumble strips per ADOT Traffic Design Section.

§      Extend minor culverts and reconstruct headwalls as required.

§      Seed all disturbed areas.

 Pertinent development considerations are listed below:

§         No new right-of-way or temporary construction easements will be required.

§         The construction season is a consideration for this project. With an average elevation of 2125 feet, the ACFC application can only be placed between March 15th and June 1st or between September 15th and November 15th. The Globe District prefers to advertise the project in November.

§         Rock excavation, including rock scaling, may require blasting, road closure, and environmental documentation.

§         A waste site for the excavated material will need to be identified during design.

§         A review of the AASHTO controlling design criteria indicates that design exceptions will be required for a rural minor arterial with a design speed of 50 mph. Design exceptions shall include grade, stopping sight distance, and superelevation. Design exceptions will be requested from the Assistant State Engineer – Roadway Group.

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