Army Corps (USACE) Study Partnership

The study process includes the following phases:

Scope and creation of alternative solutions

• Develop different flood protection and management measures

Solution Evaluation and Analysis

• Assess the quality of proposed alternative solutions and if they reach the partnership's goals

Feasibility Analysis

• Measure of the likelihood of success of the preferred solution

Washington-level review

• The preferred solution is sent to the federal government to determine whether it will receive funding

CSRM studies are typically completed in three years. However, timelines for very large or complex studies can extend if necessary. After an initial review of the project scope, Army Corps and City of Boston teams agreed that due to the study size, location, and complexity of the project, the study needed six years instead of three. The current schedule below was approved by the Office of the Assistant Secretary of the Army for Civil Works in 2023, and is up to date as of September 2025.

• Alternative Milestone Meeting, Completed February 2023
• Tentatively Selected Plan Milestone, anticipated Winter 2026
• Release of the Draft Feasibility Report, anticipated Spring 2026
• Submittal of Final Feasibility Report, anticipated Fall 2027
• Signed Chief's Report (Final Milestone), anticipated Spring 2028

The study area is within the administrative borders of the City of Boston. The study builds on the City’s previous efforts through Climate Ready Boston. It includes the five coastal neighborhoods along Boston Harbor: Charlestown, East Boston, Downtown and North End, South Boston, and Dorchester. The Study will consider long-term flood risk in combination with sea level rise. 

The Study will be conducted alongside other USACE and State studies, including the Boston Metropolitan Area Coastal Study, New Charles River Dam Planning Assistance to States Study, and Muddy River Flood Risk Management and Environmental Restoration project. Part of the study strategy is to align the Study’s recommendations with state and regional planning efforts for consistency and comprehensiveness.

The study will build on the Climate Ready Boston initiative and recommend measures that are eligible for direct federal investment. The study will incorporate near-term Climate Ready Boston projects that are in the process of design and construction and allow for close consideration and coordination on the City’s medium to long term plans. The study is uniquely positioned to consider the entirety of existing city, federal, state, and local plans and projects.

The City of Boston CSRM Study is taking place in parallel with the Boston Metropolitan Area Coastal Resilience Study. That study is being conducted by USACE and the State of Massachusetts Executive Office of Energy and Environmental Affairs. It will assess long-term risk and resilience at a watershed level. Both studies are carried out in close coordination. Recommendations of the City of Boston Study will be aligned with state and regional plans.

The USACE Planning Assistance to States Study of the New Charles River Dam is a state-level study looking at future impacts of climate change and sea level change on dam operations. This technical study will assist the State in identifying when and how the dam should be adapted, physically or operationally. The results of the Charles River Dam study will be built into the City of Boston CSRM Study.

The City’s near-term projects will continue as planned and will be built into USACE coastal and engineering models describing existing and future conditions and flood impacts. The City will coordinate and remain in alignment with USACE on medium- and long-term projects. Overall, we will balance the City’s ongoing near-term coastal resilience efforts with proposed longer term solutions identified through the CSRM study.

USACE recognizes that the City has been through an extensive planning and community engagement process and has received significant community feedback. All past work will be included in this study. We will begin with the conceptual designs developed through Climate Ready Boston and will complete a required formulation process and feasibility analysis to make final recommendations and unlock access to federal resources for design and construction.

The study will consider both:

• structural (e.g., seawalls, floodwalls, revetments, surge barriers, elevated harborwalks, nature-based solutions), and
• non-structural measures (e.g., permitting requirements, zoning changes, building-based adaptation, evacuation routes).

Yes, nature based solutions are an important component of coastal resilience and we will consider these strategies wherever possible in the study. We will examine harbor conditions, considering Boston’s tide range and varied exposures to wave energy, as well as factors such as coastal adaptability to evaluate to what extent nature-based solutions could be appropriate in specific locations. We will also examine opportunities to use nature-based solutions in combination with other measures.

ThesStudy is cost-shared 50/50 between the City and the federal government. The City has committed to this project in its capital budget. In the longer term, if the study unlocks congressional authorization, a large fraction of federal cost-share will support the design and construction of the recommended projects.

USACE routinely works closely with other federal agencies, such as:

• the Federal Emergency Management Agency (FEMA)
• the U.S. Coast Guard
• the National Parks Service
• the U.S. Fish and Wildlife Service
• the National Oceanic and Atmospheric Administration’s National Marine Fisheries Service, and
• the U.S. Environmental Protection Agency.

USACE has invited many entities to participate in the study process. While USACE does not develop plans to meet FEMA requirements, they collaborate with FEMA and to identify risk in the floodplains.

State agencies who own coastal land are closely involved as stakeholders and resource agencies for this study. This includes:

• the Massachusetts Port Authority (Massport)
• the Massachusetts Bay Transportation Authority (MBTA), and
• the Department of Conservation and Recreation (DCR).

This study will consider these Agencies’ individual resilience and asset protection plans.

While this study is only one element of coastal resilience work, it may serve as an opportunity to advance other types of resilience. We will evaluate coastal storm risk, but to fully understand the risk and impact, it is important to understand the impacts of other stressors. This study will not recommend housing projects, or changes to transit, nor will USACE seek to influence how the city invests in economic development. However, by understanding these stressors, we can identify a comprehensive plan to manage coastal storm risk without exacerbating other stressors. The opportunity comes in raising awareness of the impacts to other federal, state, and local agencies, which can then lead to additional resilience work. Concerns identified through this study will be integrated into broader Climate Ready Boston and general City of Boston activities and efforts outside of this study.

Based on the selected plan, USACE will lead the design, engineering, and construction of the recommended flood protection measures in partnership with the City. The development and construction of the project will be cost-shared between the City of Boston and USACE. Meanwhile, the City of Boston will keep working to advance near-term coastal resilience projects. The City of Boston as the non-federal partner will be responsible for operations and maintenance of the project. However, USACE will routinely inspect the project for maintenance and upkeep. If a storm event causes damage to the project, it is rehabilitated at full federal cost. The partnership will continue after the project is constructed.

Based on the selected plan, USACE will lead the design, engineering, and construction of the recommended flood protection measures in partnership with the City. The development and construction of the project will be cost-shared between the City of Boston and USACE. Meanwhile, the City of Boston will keep working to advance near-term coastal resilience projects. The City of Boston as the non-federal partner will be responsible for operations and maintenance of the project. However, USACE will routinely inspect the project for maintenance and upkeep. If a storm event causes damage to the project, it is rehabilitated at full federal cost. The partnership will continue after the project is constructed.

• Get in touch with us directly. Email Kate Roosa at kathryn.roosa@boston.gov.

• Book a virtual office hours session.