Baltimore-Washington Parkway Widening Feasibility Study

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Baltimore-Washington Parkway Widening Feasibility StudyExecutive SummaryExpected Infrastructure Impacts per Widening OptionInterchange Reconstruction Bridge Widening Bridge ReconstructionNPS AASHTO/SHA NPS AASHTO/SHA NPS AASHTO/SHAOutside Inside Outside Inside Outside Inside Outside Inside Outside Inside Outside Inside11 2 11 2 7 6 7 6 7 4 7 5PreliminaryCapitalCostEstimatesPreliminary capital cost estimates for each widening option were developed for major elements ofhighway construction based on conceptual engineering designs for the widening, including earthwork,paving, shoulders (curb, traffic barrier, guardrail, etc.) and structures (bridge widening, newconstruction, and demolition). Other categories of cost estimates included the service costs involved inproject development and design. Lastly, an estimate of administrative costs for construction wereadded to yield a total estimated capital cost, as summarized in the table below.Estimated Capital Costs for Each Widening Option ($ Millions)*Cost Elements AASHTO/SHA NPSInside Outside Inside OutsideConstruction Costs $ 326 $ 450 $ 274 $ 427Preliminary Engineering $ 33 $ 45 $ 27 $ 43Construction Administration $ 51 $ 70 $ 42 $ 66Total Costs $ 410 $ 565 $ 343 $ 536*2011 DollarsAlthough this feasibility study indicated that the potential exists for some minor encroachments ontoproperty beyond the existing B-W Parkway right-of-way, it is assumed that through more detaileddesign, these impacts could be mitigated and the acquisition of little, if any, additional land would berequired for any of the four options studied. Therefore, cost estimates do not include the costs of land.10 November 2012
Baltimore-Washington Parkway Widening Feasibility StudyExecutive SummaryEnvironmentalAnalysisandEffectsThe B-W Parkway Corridor is rich and diverse in natural andcultural resources, community features, and open space. Theparkway itself is a legislatively-defined unit of the NPS and islisted on the NRHP. This presents unique challenges to theplanning of transportation infrastructure expansion orimprovements to the parkway. Large government propertieswithin proximity to the corridor include the USDA’s BeltsvilleAgricultural Research Center (BARC), the NASA Goddard Space Photo by Tom Fuchs, February 18, 2006Flight Center, headquarters of the NSA, Fort George G. Meade,Patuxent Research Refuge, Anacostia Park, and Greenbelt Park. These properties possess significantnatural and cultural resources that contribute to the overall experience and aesthetic features of theParkway.Other eligible historic resources such as the Greenbelt National Register Historic District lie within thecorridor. Growing and vibrant communities lie adjacent to and within the viewshed of the B-W Parkway,typically near the Parkway’s interchanges with MD 197, MD 198, and MD 175.Potential Environmental and Cultural ImpactsAASHTO/SHANPSWidening Options Outside Inside Outside InsideForest Impacts, Inside Existing ROW(Percent of total acres)35% 26% 25% 9%Wetland Area Crossings (Each) 18 6 18 0Stream/Rivers/Floodplain Areas (Each) 6 6 6 6Sensitive Species Areas (Each) 5 5 5 5Potential Historic Properties (Each) 4 2 4 2Potential Park Properties (Each) 2 1 2 1The possible highway expansion options were examined with respect to the possible effects (positiveand negative) on the known environmental resources and communities. Analyzed at a conceptual levelusing available information, a range of unavoidable direct impacts are anticipated with parkwaywidening. Should the study progress into an actual project planning and design process, the magnitudeof these impacts would be measured using acceptable methods and procedures.11 November 2012
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Baltimore-Washington Parkway Widening Feasibility Study

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