9th Street Bridge Replacement
Location: Washington, D.C.
Client: Federal Highway Administration - Eastern Federal Lands Highway Division
JMT was the lead designer for the Contractor of this
challenging $51 million design-build project, which serves as a
gateway to our Nation's Capital.
The clients desired to replace a
seven-span structure that was constructed in 1941 while maintaining
roadway traffic along a congested arterial as well as freight and
passenger railroad operations near Washington DC's Union
Station. The Design-Build Team focused on achieving a
streamlined, four-span bridge over CSXT, Amtrak and New York
Avenue, along with the reconstruction and widening of New York
Avenue and the realignment and construction of three new signalized
intersections.
The project included context sensitive designs for numerous user
enhancements including widened sidewalks and bicycle lanes, ADA
compliant crosswalks, and aesthetic architectural elements.
The project was completed on schedule through partnering
between all project shareholders including the FHWA-EFLHD, DDOT,
Amtrak, CSXT, and the USPS.
Major components of this project
include:
Highways & Bridges -
The project required the full depth reconstruction and widening of
1,700 feet of New York Avenue along with the realignment and
construction of three new signalized intersections. All
roadway design work and construction document preparation met the
CADD standard requirements of the FHWA-EFLHD. The new bridge
concept, a 645' long four-span structure, was developed to minimize
impacts to the railroads and utilities and to provide a more open
section at New York Avenue. A new retaining wall along 9th
Street resulted in a decrease in stormwater management impacts to
the US Postal Service's Brentwood facility.
Traffic Engineering/ITS -JMT developed
maintenance of traffic, signing, pavement marking, and signal
plans. The MOT plans involved both detours of traffic and
maintaining traffic along the existing roadways, and included
designs for temporary construction signing and markings,
barricades, channelization devices, and phasing for the
project. Traffic signal plans were developed for four
intersections and included the various temporary signal phases of
construction. All plans were developed to DDOT and MUTCD
standards.
Water Resources Management - JMT was
responsible for the drainage, erosion and sediment control,
stormwater management and environmental permits and approvals for
complete replacement of the 9th Street Avenue Bridge and
the reconstruction of New York Avenue and realignment of the Mt.
Olivet, 9th Street and Brentwood Parkway intersection. A
new and reconstructed drainage system was designed, with all
approvals.
Utility Relocation and
Coordination - The existing bridge was traversed by an
existing 16-inch water main owned by the District of Columbia Water
and Sewer Authority (DC Water), and relocation was necessary to the
new parallel bridge currently under construction. JMT
proceeded according to DC Water standards and provided appropriate
horizontal and vertical alignments of approximately 2,000 lf of
16-inch water main. The design included 500 lf of 16" water main
supported by the proposed bridge structure, which was encased in a
steel casing pipe over the railroad facilities. The design of pipe
hangers and supports was necessary to provide for the placement of
the water main on the bridge structure.
Survey and Mapping - JMT
provided design services necessary for the relocation of catenary
facilities affected by the construction. JMT supplied survey
support in the form of miscellaneous topographical surveys,
baseline stakeout and boundary surveys; and the preparation of
multiple right-of-way plats for the new easements and fee simple
takes that occurred during construction.
Existing property boundaries were
established after performing associated surveying computations
based on public and private land records. Public records were
obtained from research conducted at the DC Office of the Surveyor
and the Recorder of Deeds Office. Based on highway
improvement needs, JMT staff prepared plats and legal descriptions
to facilitate fee-simple takings, securing of easements and to
support the Transfer of Jurisdiction process.
Graphics - JMT's
in-house graphic artists developed and provided presentations and
displays for Advisory Neighborhood Commission meetings using
graphic software programs including 3-D photo realistic renderings
(before and after) A project website was created to include login
for file uploading to secured and public area.
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