This presentation talks about hoover dam bypass bridge from the perspective of infra project life cycle. Hope you find it you useful.

1. Hoover dam bypass bridge

2. Table of contents
❖ introduction
❖ Pre-feasibility
❖ Project conception
❖ Project need & objective
❖ Project preparation
❖ Environmental impact assessment
❖ Technical assessment
❖ Financial information
❖ Construction
❖ Operation & maintenance
❖ Transfer of the project

3. Introduction
❖ Hoover dam bypass is a part of 4 miles long
highway connecting Arizona and Nevada
interstates.
❖ The new 1900 ft. (571 m) Hoover dam bypass
bridge spans the black canyon at about 1500 ft.
(457.2m) south of the Hoover Dam, connecting
the Arizona and Nevada approach highways
nearly 900 ft.
❖ The bridge carries four lanes of traffic and
sidewalk.
❖ It is a composite steel concrete deck arch bridge
with main span of 1060 ft. (323m). The arch rib is
made of reinforce concrete.
❖ It is the second largest concrete arch bridge span
in the world. The bride is owned by Arizona DOT
and Nevada DOT.

4. Pre-feasibility stage
❖ Project conception
❖ “Colorado river bridge project management team” came into place by joint decision of
Navida and Arizona state department of transportation.

5. Project Need and objective
Potential problems identified
❖ Accidents
❖ Sharp turns
❖ Limited sight distances
❖ No adequate room for
disabled cars
❖ Speed was as low as 15MPH
against initial speed of 50MPH
❖ inadequate road capacity
❖ Less travel times

6. Objective of the project
• To minimise the potential for traffic accidents
• To remove the bottlenecks to interstate and international commerce to reduce traffic
congested
• To reduce travel time
• To protect Hoover dam employees, visitors, equipment, power generations capabilities
• To provide safe and improved conditions for the maintenance and operation of Hoover
dam
Project Preparation activities
After initial surveys at this point it was decided to carryout two important studies in detail
❖ Engineering & technical aspect
❖ Environmental impact assessment

7. Environmental impact assessment
studies
• Air quality analysis
• Noise analysis
• Visual resources analysis
• Biological assessments
• Archaeological resources survey
Project Design
The requirement for the design of the bridge was both
technical and aesthetics of the bridge, the most important
requirement in the design would be design load which in
this case was 180 metric tons. Various designs were
studied some of them were as follows.
After considering the design criteria for the bridge the
team selected composite steel and concrete type of
bridge that met all the design criteria.

8. Financial information
Contract contractor value
Arizona Approach
Mont/VASTCO $22M
Navida Approach
Edward Kraemer & sons $30M
River bridge
Obayashi/Mitsubishi $114M
Paving
Freshener & Las Vegas paving $15M
Total $181M

9. Construction
❖ Phase 1. Building connection between
Colorado Bridge and U.S 93 this included 4
lanes of roadway
❖ Phase2. This was from Navida side, The
Roadway from the project start to the
Colorado Bridge, started in 2003 and finished
in 2005 ahead of time by 2 months.
❖ Phase3. The contractor constructed 2.11 miles of new four-lane highway
alignment including six new bridges, a new traffic interchange at US 93 near the
Hacienda Casino, retaining walls, wildlife crossing.
❖ Phase4. Asphalt paving of the entire 4 miles from Arizona to Nevada side to the
project. This was complete in 2010.

10. Operation & maintenance
The operation and maintenance is either side of
the bypass bridge done by Arizona state DOT
and Nevada State DOT. The aim of the
maintenance is to insure safety, carryout visual
and technical inspection of the bridge, to
maintain smooth traffic flow, repairs to the
bridges, road pavements. The funding for the
same comes from the Nevada and Arizona
state departments of transportations.

11. Achievement
❖ The project completion on budget was a great success story although it went slightly
away from the schedule. The project primary purpose and objective of reduction in
traffic congestion was achieved and this facilitated smooth traffic.
❖ The travel time of the existing road was 16.5minutes while this newly construction
facility reduced it to 6 minutes, a total of 10 minutes were saved. This also increased
speed. The environmental impact assessment helped reduce and mitigate the problems
of environment and also wild life crossing between different points.

12. Project Schedule

13. Project Transfer
The twin-rib arch of the Colorado River
Bridge was completed in August 2009 and
the bridge columns were constructed in
November 2009. Construction of the entire
bypass was completed in September 2010. It
was celebrated by making grand ceremony.
The bypass opened to traffic a month later in
October 2010.

14. Learning
This project helped me a lot in understanding the complexity of the infrastructural project
development, in this exercise I learned various surveys required in each stage of the project,
the project coordination, construction and impact analysis on the environment. Every project
before comes into existence must go through a logical process, I learned practically what
process were involved in this project.
Conclusion
The Hoover Dam, Bypass Colorado River Bridge was an extreme challenge, due to the
structure itself, advanced construction schemes, and the surrounding environment. The
effort of all personnel involved made the incredible graceful bridge into reality. The Hoover
dam bypass Colorado River Bridge was completed in 2010, The Bridge was opened to
traffic on October 2010. The Project resulted iconic landmark structure set in the Colorado
River’s black canyon with a view to historic Hoover Dam. Ten minutes reduction time was
another achievement followed by reduction in traffic congestion and accidents.

15. References
1. http://energy.gov/sites/prod/files/nepapub/nepa_documents/RedDont/EA-1478-FEA-2003.pdf
2. http://www.roadtraffic-technology.com/projects/hoover-bypass/
3. https://books.google.co.in/books?id=jJ3MBQAAQBAJ&pg=PA1282&dq=hoover+dam+bridge&hl=en&sa=X&ved=0CCIQ6AEwAmoVChMI4
4. http://www.roadtraffic-technology.com/projects/hoover-bypass/hoover-bypass6.html
5. http://www.jpci.or.jp/NR/pdf/40.pdf
6. http://design.transportation.org/Documents/SCOD,Hammontree,FHWA,HooverDamBypass.pdf
7. http://www.klbconstruction.com/pdf/making_history_near_hoover_dam.pdf
8. http://www.crma.ac.th/histdept/journal/jour-49/49-jour-12.pdf
9. http://transportation.ky.gov/SASHTO/The%20Mike%20OCallaghan%20Pat%20Tillman%20Memorial%20Bridge.pdf
10. http://mcedc.colorado.edu/sites/default/files/FinalHooverDamBypass.pdf
11. http://www.hpcbridgeviews.com/i63/Printable.pdf
12. http://www.atkinsglobal.com/en-gb/projects/hoover-dam-bypass
13. http://nepis.epa.gov/Exe/ZyNET.exe/20005FMQ.TXT?ZyActionD=ZyDocument&Client=EPA&Index=2000+Thru+2005&Docs=&Query=&T