Marshfield-04D
Marshfield, Green Harbor
42.086344, -70.650728
Technical Specifications
Basic Properties
- Type
- Flap Gate
- Material
- Wood
- Control
- —
- Condition
- Unknown
- Geometry
- Rectangular
- Status
- Active
- Number of Gates
- 0
Operator & Management
- Operator Type
- PUBLIC
- Operator
- Town of Marshfield
- Permits
- —
- Purpose
- Unknown
Dimensions & Elevations
- Dimensions
- —
- Invert Elevation
- —
- Installation Date
- —
- Tidal Influence
- —
Culvert Details
- Restriction Type
- Roadway
- Geometry
- Rectangular
- Material
- Concrete
- Bottom Material
- Other
- Number of Pipes
- 0
- Dimensions
- —
- Condition
- Unknown
- Comments
- —
Restoration Potential
Assessment
- Salt Marsh Impairment due to Tidal Restriction
- Moderate
- Potential Extent of Marsh Restoration
- Moderate
- Implementation Feasibility
- High
- Restoration Priority
- High
- Recommended Improvement Type
- O&M and Infrastructure
Notes
Site shows moderate salt marsh impairment due to restricted tidal flow. Replacement with self-regulating tide gate could restore approximately 5-8 acres of degraded marsh habitat. Good access for construction equipment. Regional coordination completed with town DPW and conservation commission.Historical Records
Environmental Data
- Invasive Species
- Yes
- Restoration Status
- In-Progress
- Invasive Comments
- Phragmites observed dying back on fringe.
- Restoration Comments
- —
- Upstream Area
- Salt Marsh: >100 acres
Notes & Comments
- General Comments
- Site is located directly off of Dyke Road and easily accessible. Note that Jason Burtner can provide permitting drawings and other relevant files and site information to further flesh out attributes.
- Operation Plan
- —
- Operation Comments
- —
- Gate Comments
- New gate installed in 2009, adjustments completed in 2011. It is a 4-bay flapper system with one gate replaced by adjustable sluice. Please see Marshfield-04A, Marshfield-04C, and Marshfield-04D for information on the other tide gates.
- Elevation Comments
- —
- Visit Comments
- —
- Other Comments
- Reclaimed land originally for grazing, this area is a polder
- External Data Comments
- Green Harbor River Operation and Maintenance Plan 3.17.2009 Green Harbor River Tide and Precipitation Data 12.31.2009
Part of the Massachusetts Bays Program© 2026 Massachusetts Bays Program. Monitoring tidegates across Massachusetts.