Quincy-03
“Broad Street”Quincy, Town River Bay
42.256124, -70.993907
Technical Specifications
Basic Properties
- Type
- Flap Gate
- Material
- Metal
- Control
- —
- Condition
- Good
- Geometry
- Rectangular
- Status
- Active
- Number of Gates
- 0
Operator & Management
- Operator Type
- PUBLIC
- Operator
- Town of Quincy
- Permits
- ACOE
- Purpose
- Flood Protection
Dimensions & Elevations
- Dimensions
- 4ft diameter, 4ft height
- Invert Elevation
- -2.08 NAVD88
- Installation Date
- —
- Tidal Influence
- Upstream: N/A NAVD88, Downstream: 5.5 NAVD88
Culvert Details
- Restriction Type
- Roadway
- Geometry
- Rectangular
- Material
- Concrete
- Bottom Material
- —
- Number of Pipes
- 0
- Dimensions
- 4ft diameter, 4ft height
- Condition
- Good
- Comments
- Culvert was embedded into a concrete headwall that appeared to have been recently installed and was in good condition.
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
- No
- Restoration Status
- Not Applicable
- Invasive Comments
- N/A no upstream impounded area was present at this site. Could not locate where stormwater system daylights upstream.
- Restoration Comments
- —
- Upstream Area
- —
Notes & Comments
- General Comments
- Tide gate easily accessible and located at bottom of new headwall at the northern end of Broad Street.
- Operation Plan
- No
- Operation Comments
- Tide gate appeared to be installed for the sole purpose of flood protection and conveying stormwater outflows.
- Gate Comments
- Tide gate appeared to have been recently installed and was in good condition.
- Elevation Comments
- Staining was apparent on the downstream (D/S) end of the headwall (HW) so approximate extent of U/S and D/S tidal influence was able to be assessed in addition to tide gate (TG) invert elevations. Tide gate was located at the outfall of a stormwater infrastructure network so there was not upstream area to assess. The below lists measuredowns taken with a surveyors rod and corresponding top of headwall LiDAR elevations (NAVD88 datum). 1) TG Inv: Top of HW El (D/S) = 8.00’; Inv Measuredown = 10.08’; TG Inv = 8.00 – 10.08 = -2.08’ 2) Upstream Tidal Influence: Top of headwall LiDAR Elevation = N/A; Staining Measuredown = N/A; U/S Tidal influence = N/A. 3) Downstream Tidal Influence: Top of headwall LiDAR elevation = 10.08’; Staining Measuredown = 4.58’; D/S Tidal Influence = 10.08’ – 4.58’ = 5.50’
- Visit Comments
- —
- Other Comments
- —
- External Data Comments
- US ACOE NAE-2012-353 Permit Application 2.27.2012 US ACOE NAE-2012-353 Permit 3.27.2012
Part of the Massachusetts Bays Program© 2026 Massachusetts Bays Program. Monitoring tidegates across Massachusetts.