Hoover dam bypass bridge
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Hoover dam bypass bridge
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
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.
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.
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
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
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.
Financial informationContract contractor value
Arizona Approach Mont/VASTCO $22M
Navida ApproachEdward Kraemer & sons $30M
River bridgeObayashi/Mitsubishi $114M
Paving Freshener & Las Vegas paving $15M
Total $181M
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.
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.
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.
Project Schedule
Project TransferThe 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.
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.
References
1. http://energy.gov/sites/prod/files/nepapub/nepa_documents/RedDont/EA-1478-FEA-2003.pdf2. 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=0CCIQ6AEwAmoVChMI4ZHgyvKAyAIVZHNyCh0LLwy0#v=onepage&q=hoover%20bypass&f=false4. http://www.roadtraffic-technology.com/projects/hoover-bypass/hoover-bypass6.html5. http://www.jpci.or.jp/NR/pdf/40.pdf6. http://design.transportation.org/Documents/SCOD,Hammontree,FHWA,HooverDamBypass.pdf7. http://www.klbconstruction.com/pdf/making_history_near_hoover_dam.pdf8. http://www.crma.ac.th/histdept/journal/jour-49/49-jour-12.pdf9. http://transportation.ky.gov/SASHTO/The%20Mike%20OCallaghan%20Pat%20Tillman%20Memorial%20Bridge.pdf10. http://mcedc.colorado.edu/sites/default/files/FinalHooverDamBypass.pdf11. http://www.hpcbridgeviews.com/i63/Printable.pdf12. http://www.atkinsglobal.com/en-gb/projects/hoover-dam-bypass13. http://nepis.epa.gov/Exe/ZyNET.exe/20005FMQ.TXT?ZyActionD=ZyDocument&Client=EPA&Index=2000+Thru+2005&Docs=&Query=&Time=&EndTime=&SearchMethod=1&TocRestrict=n&Toc=&TocEntry=&QField=&QFieldYear=&QFieldMonth=&QFieldDay=&IntQFieldOp=0&ExtQFieldOp=0&XmlQuery=&File=D%3A%5Czyfiles%5CIndex%20Data%5C00thru05%5CTxt%5C00000008%5C20005FMQ.txt&User=ANONYMOUS&Password=anonymous&SortMethod=h%7C-&MaximumDocuments=1&FuzzyDegree=0&ImageQuality=r75g8/r75g8/x150y150g16/i425&Display=p%7Cf&DefSeekPage=x&SearchBack=ZyActionL&Back=ZyActionS&BackDesc=Results%20page&MaximumPages=1&ZyEntry=1&SeekPage=x&ZyPURL
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