Reliance, as part of a previous GEC assignment for the City of Boston Department of Public Works (DPW), developed the accelerated bridge replacement methodology as a part of a long-term sustainability study for this aging, 3,500-ft long critical link from the mainland to Long Island, the largest of the Boston Harbor Islands. Long Island contained several essential public health facilities, and the bridge could not be closed for traffic except for short durations. The river crossing consisted of four 3- span deck truss units each 750-ft-long with a 250-ft-long simple span-through truss over the navigational channel. The project complexities included the need to maintain traffic through construction (except for a limited number of short closures over weekends), difficult access conditions under the over-land end spans, almost 10-ft tidal fluctuations, and the resulting insufficient water depth for barge operations under the nearshore deck spans, and several major utility lines carried on the bridge. The bridge replacement methodology developed by Reliance consisted of half-width reconstruction of the girder end spans, slide-out / slide-in replacement of the four-deck truss units, and float-out / float-in of the main navigational span. The city of Boston adopted this scheme for the bridge replacement strategy and advertised the project for the final design phase. However, due to significant additional deterioration discovered during a subsequent bridge inspection, the bridge had to be demolished as a safety precaution. During the initial phase of the project, Reliance provided services related to geotechnical exploration and evaluation of existing piers for re-use, utility relocation, and bridge demolition. Reliance is now providing final design phase services in bridge design and pier and abutment retrofit as part of the bridge replacement final design team.