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Due
to the nature of this four-level interchange with eight fully
directional ramps,
this TI earned the title of the largest interchange project
in the state.
The SuperRedTan TI is the intersection
of the Superstition, the Red Mountain and the Santan Freeways.
The last segment of the Red Mountain freeway, between Power
Road and University Drive, was opened to traffic in July of
2008. The TI is fully operational.
Project
The SuperRedTan TI project involved widening four miles of
US 60 between Power and Crismon Roads along with two
miles of a new six-lane segment of the Loop 202 between Baseline
Road and Southern Avenue; a four level system interchange
consisting of eight directional ramps was also designed.
Design
This project is the first one in the metropolitan area
with design icons placed on the columns in addition to the
wall patterns.
The design team included several bridge engineers to design
12 bridges with a total deck area of 321,000 square feet.
In addition to eight overpasses, there were four multi-spanned
ramp flyovers. All of the bridges are cast-in-place, post-tensioned
concrete box girders.
Because US 60 was widened to the outside, the ramps for the
service interchanges at Power, Sossaman, Ellsworth, and Crismon
Roads had to be reconfigured.
The project also included both retaining and soundwalls. There
were 60,511 square feet of mechanically stabilized earth (MSE)
walls with one segment over 53 feet tall; 54,492 square feet
of cast-in-place retaining walls; 162,040 square feet of soundwalls;
68,602 square feet of combination retaining and soundwall;
and 12,110 square feet of tie-back walls. The structural design
involved working with ADOT’s landscape architect in
the development of patterns and icons for the walls and bridge
columns.
A Citizens Advisory Team (CAT) was established to provide
a two way forum between ADOT and the local communities adjacent
to the interchange. They met regularly between 2000 and 2006
to provide input and innovative ideas from the local community
perspective throughout the process. Additionally, they reviewed
the project status and provided input related to alternatives,
final design and landscaping. The CAT met approximately 12
times during predesign and seven times in final design. The
CAT represented the following communities and businesses:
Arizona
Skies
Brentwood Southern
Crescent Run
Desert Sands
Fountain of the Sun
Golden Hills
GM Proving Grounds
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Monte
Vista
Pioneer Estates
Sierra Ranch I, II and III
Silveridge
Sunland Village East
Superstition Springs
Valle del Oro |
Construction
The project was built in two phases.
Phase I built the basins, the walls, all
of the at-grade Ramp East to South (E-S), the 202L bridges
over US 60, all of Ramps North to West (N-W) including the
flyover and the columns and frames of the flyovers for Ramps
West to South (W-S), East to North (E-N), and South to East
(S-E) over US 60 and two miles of widened US 60 between Sossaman
and Ellsworth Roads. Since maintaining traffic was of paramount
consideration during the design, a high speed, four-lane detour
was built to the south of US 60 to carry traffic around construction
of the flyovers’ frames for the TI.
Phase I was constructed by FNF Construction, Inc. at a cost
of $44,631,790.
Because Phase I was the keystone for timing construction of
near by projects to the north, south, and west, ADOT used
the A+B fast track method where the low bid is the total of
the construction cost plus the number of calendar days multiplied
by a Department supplied amount per day. FNF developed a work
plan for building the project in only 350 days. Construction
began December 4, 2003 and was substantially completed November
5, 2004.
Phase II included the rest of the construction
for the SuperRedTan TI. This work involved widening an additional
two miles of US 60 between Power and Sossaman Roads and between
Ellsworth and Crismon Roads, completing the Loop 202 mainline
along with Ramps W-S, W-N, E-N, and S-E. The remaining bridges
and the portions of the flyover ramp structures not completed
during Phase I were also built.
During the design of Phase II, the project’s limits
were expanded to allow the Phase II contractor to excavate
borrow material from a future segment to the north. One challenging
aspect of building the project in two phases was the need
for the Phase I designs to fit the Phase II final ground lines.
For example, light poles built during Phase I had to be placed
in either holes or on mounds of dirt so that they would be
at their correct elevations in Phase II.
Pulice Construction Inc. was the low bidder for Phase II with a bid
of $71,374,831. Construction began May 18, 2006 and is scheduled
to be completed in early 2007.
Project Funding
The current east Valley freeway system including the Loop
101 (Pima and Price Freeways) and Loop 202 (San Tan and Red
Mountain Freeways) was constructed through funding provided
by Proposition 300. Proposition 300 was passed by the voters
in 1985 and approved a half-cent sales tax for freeway construction.
The final two projects to be completed with this funding source
will be the Loop 202 Red Mountain Freeway from Southern Avenue
to University Drive scheduled for completion in July 2007
and Power Road to University Drive, scheduled to be completed
in mid 2008.
Additional improvements programmed for the Red Mountain Freeway
are being funded by Proposition
400 and other funding sources. (file size: 3.6MB)
Documents are posted as they become available in PDF format,
which requires Adobe Reader to view.
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Our Valley Freeway System is part of the 2004 voter-approved Regional Transportation Plan. We are working hard with our transit partners to implement the voters’ vision and are committed to quality, safety, open communication with our neighbors, and minimal inconvenience to the traveling public. |
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