Cohasset-03A
“Cat Dam”Cohasset, Inner Little Harbor
42.254242, -70.810383
Technical Specifications
Basic Properties
- Type
- Tide Gate
- Material
- Metal
- Control
- —
- Condition
- —
- Geometry
- —
- Status
- Active
- Number of Gates
- 3
Operator & Management
- Operator Type
- PUBLIC
- Operator
- Town of Cohasset
- Permits
- NOI for tide gate management developed in 2009, withdrawn during Con Com Review, Alternative NOI submitted, appealed
- Purpose
- —
Dimensions & Elevations
- Dimensions
- —
- Invert Elevation
- —
- Installation Date
- —
- Tidal Influence
- —
Culvert Details
- Restriction Type
- Roadway
- Geometry
- Rectangular
- Material
- Concrete
- Bottom Material
- —
- Number of Pipes
- 3
- Dimensions
- —
- Condition
- —
- 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
- —
- Restoration Status
- —
- Invasive Comments
- —
- Restoration Comments
- Some initial effort made towards restoration until town stopped
- Upstream Area
- Salt Marsh: 10+ acres
Notes & Comments
- General Comments
- —
- Operation Plan
- —
- Operation Comments
- —
- Gate Comments
- Large metal tidgates.
- Elevation Comments
- —
- Visit Comments
- —
- Other Comments
- —
- External Data Comments
- Inner Little Harbor Revised Notice of Intent for Proposed Operation and Maintenance Plan 1.20.2011 Inner Little Harbor Revised Notice of Intent Town Sponsored (Withdrawn) 11.16.2009 Inner Little Harbor Revised Notice of Intent Requirements 7.14.2016 Inner Little Harbor Revised Notice of Intent Withdrawal 11.22.2016 Inner Little Harbor Revised Notice of Intent Abutter Sponsored 12.16.2010 Inner Little Harbor Water Quality Analysis Report 8.2009 Inner Little Harbor Water Quality Analysis Report Analysis of Errors
Part of the Massachusetts Bays Program© 2026 Massachusetts Bays Program. Monitoring tidegates across Massachusetts.