Regional Saugus River Floodgate Project

Protecting the Communities of Lynn, Malden, Revere and Saugus, Massachusetts

Plans Evaluated

Option #1:  Local Protection Plans
Developed areas in each community were surrounded with dikes, walls, revetments & sand dunes/beach

Option #2:  Non-structural Plans
Individual buildings were flood proofed,  or raised and warning systems developed

Option #3:  A plan to protect the entire region using a Saugus River Floodgate with walls, dikes, beach & dunes along the shore front, purchase & protect the Estuary for runoff storage & environmental resources & non-structural measures.

 

Option #1: Local Protection Plans (LPPs)

The 5 separate LPPs were not supported due to 4-12 foot high walls & dikes along the shores impacting views & wetlands, and need to maintain & close 80 gated openings.

 

Local Protection Plans

 

 

Option #1: SPN Flood + 1Ft Sea Level Rise

(Elevations in Ft. NGVD, or approx. feet above mean sea level)

Option1 SPN Flood 1Ft Sea Level Rise

 

Option #2: Nonstructural Plan For Residential & Commercial Buildings

Non-structural measures alone were not supported since only 7% of buildings were feasible for flood proofing or raising, and the uncertainty of evacuating over 4,000 to 10,000 people in such high levels of flooding.

Option2 Nonstructural plan

 

Option #3: Regional Project Protects Entire Area

Option3 Regional Project

 

Plan Comparison

  Option #1
5 LPPs
Option #2
Non-Structural
Option #3
Regional Plan
Buildings Protected 4,320 240 5,000
Percent Protected 86% 7% 100%
Length of Structures 9.8 Miles N/A 3.5 Miles
       
Wetlands Lost, Mitigated 34 Acres None 3 Acres
       
Estuary Protection No No Yes
       
Loss of Views High, up to 12 ft.
High Walls/Dikes
NIL 15-20 Homes at
Point of Pines
       
Level of Flood Protection      
City of Lynn, East Saugus 500 Yr 0-100 Yr SPN
Town Line Brook 100 N/A SPN
       
Point of Pines w/Dunes Only SPN 0-100 SPN
Revere Beach Backshore 100-SPN 0-100 SPN
       
Northgate, Outer Oak Island No 0-100 SPN
Upper Saugus River, Rt. 107, B&M No No SPN
Crescent Beach 100 0-100 100
       
Plan Economics (2019 Price Level, $ Millions)
First Cost $183 $19 $220
       
Average Annual Benefits $23.37 $3.61 $28.28
Average Annual Cost $17.80 $1.81 $22.29
       
Average Annual Net Benefits $5.57 $1.8 $5.99
Benefit-to-Cost Ratio 1.3 2.0 1.3
National Economic Development Plan No No Yes
       
Benefits & costs updated from 1988 with a construction cost index
       
Evaluation      
Complete, Efficient Yes Yes Yes
       
Effective Partial
w/ 80 Gates
No Highest
       
Acceptable to Sponsor Minimal Minimal High
       
National Economic Development Plan No No Yes
      Selected

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Definitions & Abbreviations