MIT Sivil Engineering – 1.011 Project Evaluation Spring Term 2003Jennifer Moore Page 1The Carquinez Strait BridgesThe Future of Northern CaliforniaBy Jennifer MooreBy Jennifer MooreMay 12, 2003May 12, 2003Bridge Characteristics8 Bridges link Bay Area8 Bridges link Bay AreaCarquinez Carquinez Bridge a major Bridge a major connector between Bay connector between Bay and farther northand farther north110,000 average daily 110,000 average daily trips=second most used trips=second most used bridgebridgeAccounts for about 18% Accounts for about 18% of toll revenue (27M)of toll revenue (27M)Expected growth of 44% Expected growth of 44% + 48,500 daily riders+ 48,500 daily ridersHistory: First steel truss bridge built in 1927, History: First steel truss bridge built in 1927, followed by a second steel truss bridge, 1958followed by a second steel truss bridge, 1958Problem: Oldest bridge has expanded life span, Problem: Oldest bridge has expanded life span, both bridges are not earthquake soundboth bridges are not earthquake soundSolution: Dismantle 1927 bridge, retrofit 1958 Solution: Dismantle 1927 bridge, retrofit 1958 bridge, build a new twinbridge, build a new twin--tower suspension tower suspension bridge(Al bridge(Al ZampaZampaMemorial), west of existing Memorial), west of existing bridge, and build new Crockett Interchange bridge, and build new Crockett Interchange Project OverviewConstruction PicturesBridge BenefitsImproves mobility across Northern California:Improves mobility across Northern California:--satisfy current seismic and safety standardssatisfy current seismic and safety standards--correct existing roadway deficienciescorrect existing roadway deficiencies--improve traffic safetyimprove traffic safety--maintain routes for local, regional, and maintain routes for local, regional, and interstate truck freight movementinterstate truck freight movement--support high occupancy vehicle (HOV) usesupport high occupancy vehicle (HOV) use--addition of public amenities (bike lanes and vista)addition of public amenities (bike lanes and vista)Bridge CostsInitial Estimates=$340MInitial Estimates=$340MActual Costs= $480MActual Costs= $480M--Regional Measure I (1988)Regional Measure I (1988)Cause a huge bottleneck during project spanCause a huge bottleneck during project spanImpact on local residents and environmentImpact on local residents and environment--Loss of 20 homes, noise, water Loss of 20 homes, noise, water disturbancesdisturbancesMIT Sivil Engineering – 1.011 Project Evaluation Spring Term 2003Jennifer Moore Page 2Project FundingRegional Measure I (1988): voterRegional Measure I (1988): voter--approved approved measure, run by Bay Area Toll Authority measure, run by Bay Area Toll Authority (BATA) to set a uniform toll of $1 on all (BATA) to set a uniform toll of $1 on all statestate--owned Bay Area bridges, specifically owned Bay Area bridges, specifically for bridge and transit improvements for bridge and transit improvements Collaboration between BATA, Metropolitan Collaboration between BATA, Metropolitan Transportation Commission (MTA), State Transportation Commission (MTA), State ((CaltransCaltrans), and local Crockett residences), and local Crockett residencesProject Funding, cont.State Senate Bill 226: State transferred a portion State Senate Bill 226: State transferred a portion of revenues and existing fund balances collected of revenues and existing fund balances collected before June 30,1998.before June 30,1998.Total transfer amount: $600 MTotal transfer amount: $600 MTotal bonds issued: $400 M fixed and variable Total bonds issued: $400 M fixed and variable rate, more to be issued soonrate, more to be issued soonTOTAL Available Funding > $1 BillionTOTAL Available Funding > $1 BillionCarquinez Carquinez Bridges= approx 36% of fundingBridges= approx 36% of funding--$144M of Bond (mature in 2018 and 2035)$144M of Bond (mature in 2018 and 2035)Cost/Benefit Analysis-150-100-50050100150$ (millions)012345678Time (years)i=5%NPV Cost=$144MNPV Rev=$146MAnnual Rev=$27MConclusionTheTheCarquinezCarquinezBridges are not only Bridges are not only essential for commuters and travelers, but essential for commuters and travelers, but also profitable if $2 toll remainsalso profitable if $2 toll remainsImprovements will help alleviate large Improvements will help alleviate large traffic jams and make driving more safetraffic jams and make driving more safeFinal Question: What will the growing Final Question: What will the growing demands of the Bay Area have in store for demands of the Bay Area have in store for the future of its bridges? the future of its bridges? References“Toll Bridge Report to the California “Toll Bridge Report to the California Legislature.” Metropolitan Transportation Legislature.” Metropolitan Transportation Commission Commission http://www.mtc.ca.gov/bata/pdfs/ http://www.mtc.ca.gov/bata/pdfs/ toll_bridge_report_2002.pdftoll_bridge_report_2002.pdf“Bay Area Toll Authority Sells $400M in Bonds “Bay Area Toll Authority Sells $400M in Bonds for Bridge Work.” for Bridge Work.” http://www.mtc.ca.gov/ http://www.mtc.ca.gov/ whats_happening/press_releases/rel159.whats_happening/press_releases/rel159.htmhtm““Carquinez Carquinez Bridge.” Bridge.”
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