Boston North Shore Study
Regional Saugus River Floodgate Project - Everett, Lynn, Malden, Revere and Saugus, Massachusetts
Project Costs, Timeline & Environmental Opportunity
Project provides opportunity to enhance 500 acres of upper Estuary by breaching I-95 Embankment. It will be exempted from the ACEC Designation as it is approved by CZM through its Federal Consistency Review.
Project Cost Estimate
Preliminary*
| Project First Cost at 2020 price levels | $231.5 million |
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| Federal Cost (64%) | $149 million |
| Non-Federal cost (36%) | $82.5 million** |
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** includes: Lands, Easements, Rights-of-Ways, Relocations, & Cash Contribution |
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| Non-federal Operation, Maintenance & Replacements | $600,000/year |
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*Updated to 2020 p. l. using construction cost index. *Costs incl. Planning, Engineering & Design (PE&D), Construction Mgt (CM) & Real Estate (RE) & Relocation (R) of utilities costs |
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Non-Federal Costs
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Pre-Construction Cash: |
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| Update Design & Permits
(Cost Shared 64/36) |
$900,000 | |
| Planning, Engineering & Design (P,E&D)
(Incls. $1,140k for Envir. Restor./E. Saugus Mitigation.) |
$6,390,000 | |
| Total Cash Prior to Construction | $7,290,000* | |
| Costs During Construction: | ||
| Lands: Estuary & Other | $25,350,000 | |
| Relocate Utilities | 1,900,000 | |
| Recreation/Park Dike | 3,100,000 | |
| Cash Contribution | 44,890,000 | |
| Total Non-Federal Cost | $82,530,000 | |
Note: Total non-Fed cost to COMPLETE P,E&D & Updates = $7.3 million.
Project First Cost & O&M By Feature
| Preliminary 2020 Price Level* | |||
| First Cost | O&M | ||
| Floodgate Structure | $ 148,000,000 | $325,000/year | |
| Lynn Harbor | 32,000,000 | 29,000 | |
| Point of Pines (w/revet.) | 16,000,000 | 23,000 | |
| Parkland Dike, Wall, Tide Gate | 11,000,000 | 31,000 | |
| Mitigation Site | 1,000,000 | 4,000 | |
| Estuary Acquisition | 16,000,000 | Envir.Mgr.: | 186,000 |
| Sub-Total | $224,000,000 | $598,000 | |
| Environ. Restor. (Breach i-95) | $6,600,000 | $7,000 | |
| Update Feasibility Rpt.& Staff | 900,000 | Total | $605,000 /year |
| Total First Cost | $231,500,000 | ||
| SAY | $230,000,000 | average Annual |
*’88/’91 Costs Updated by RS Means Index, incl. PE&D, CM, RE, R
Average Annual Project Cost
| 2019 Price Level | |
| Project First Cost, 2019 P.L. | $221,300,000 |
| Interest During Construction | 25,500,000 |
| Total Investment | $246,800,000 |
| Interest & Amortization on Investment (8 7/8%, 100 Years) |
$21,900,000 |
| Operation, Maintenance & Replacements | 600,000 |
| Total Average Annual Cost | $22,500,000 |
Project Economic Justification
2019 Price level
Average annual benefits: $ 28,500,000
Average annual cost: $ 22,500,000
Average annual net benefits: $ 6,000,000
Benefit-to-Cost Ratio (BCR): 1.3 to 1.0
The benefits and costs reflect a one (1) foot rise in sea level. Since there is a strong indication that sea level is accelerating, benefits will rise much higher with only a marginal change in costs, since the Floodgates would be designed to be easily modified for the higher rates of sea level rise. Benefits are not included for preventing damages to the Town Line/Linden Brooks Area of Everett, Revere & Malden, nor to the Upper Saugus River & Shute Brook areas of Saugus, or benefits to provide a safe harbor of refuge.
The Governor can request the Corps to resume the process through public support.
