Layers:

Layer: Dams (0)


Name: Dams

Display Field: DAM_NAME

Type: Feature Layer

Geometry Type: esriGeometryPoint

Description: The ODS maintains a database that includes detailed information about each dam for operational purposes. Most of the location information was derived from historic data and has been ground-truthed against inspection and ownership reports that are maintained by the ODS. The locations of some dams have not been confirmed. These are pending verification and can be identified through the field 'LocStatus.’Dams regulated by the ODS in accordance with regulation CMR 302 10.00 are listed as ‘Office of Dam Safety’ in the field ‘RegAuth’.Please report any data errors or inconsistencies to the Office of Dam Safety (dam.safety@state.ma.us) or DCR-GIS (chandreyee.lahiri@state.ma.us)

Copyright Text: MA Office of Dam Safety, MA Dept. of Conservation & Recreation

Min. Scale: 3000000

Max. Scale: 0

Default Visibility: true

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

XMin: 36932.4426999986
YMin: 789460.562199999
XMax: 324781.340499997
YMax: 957476.1109
Spatial Reference: 26986 (26986)


Drawing Info:

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HasZ: false

HasM: false

Has Attachments: false

Has Geometry Properties: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: OBJECTID

Unique ID Field:

Name : OBJECTID

IsSystemMaintained : True


Global ID Field:

Type ID Field: HAZARD_POTENTIAL_CLASSIFICATION

Fields:
• OBJECTID (type: esriFieldTypeOID, alias: OBJECTID, SQL Type: sqlTypeOther, length: 0, nullable: false, editable: false)
• NATID (type: esriFieldTypeString, alias: NATID, SQL Type: sqlTypeOther, length: 255, nullable: true, editable: true)
• DAM_NAME (type: esriFieldTypeString, alias: Dam Name, SQL Type: sqlTypeOther, length: 255, nullable: true, editable: true)
• CITY_TOWN (type: esriFieldTypeString, alias: City/Town, SQL Type: sqlTypeOther, length: 255, nullable: true, editable: true)
• MASSGIS_TOWN_ID_CODE (type: esriFieldTypeString, alias: MassGIS Town ID Code, SQL Type: sqlTypeOther, length: 255, nullable: true, editable: true)
• LATITUDE (type: esriFieldTypeDouble, alias: Latitude, SQL Type: sqlTypeOther, nullable: true, editable: true)
• LONGITUDE (type: esriFieldTypeDouble, alias: Longitude, SQL Type: sqlTypeOther, nullable: true, editable: true)
• REGULATORY_AUTHORITY (type: esriFieldTypeString, alias: Regulatory Authority, SQL Type: sqlTypeOther, length: 255, nullable: true, editable: true)
• FERC_PROJECT_NO_ (type: esriFieldTypeString, alias: FERC Project No#, SQL Type: sqlTypeOther, length: 255, nullable: true, editable: true)
• HAZARD_POTENTIAL_CLASSIFICATION (type: esriFieldTypeString, alias: Hazard Potential Classification, SQL Type: sqlTypeOther, length: 255, nullable: true, editable: true)
• RIVER (type: esriFieldTypeString, alias: River, SQL Type: sqlTypeOther, length: 255, nullable: true, editable: true)
• WATERSHED (type: esriFieldTypeString, alias: Watershed, SQL Type: sqlTypeOther, length: 255, nullable: true, editable: true)
• OWNERSHIP_TYPE (type: esriFieldTypeString, alias: Ownership Type, SQL Type: sqlTypeOther, length: 255, nullable: true, editable: true)
• OWNER_S_ (type: esriFieldTypeString, alias: Owner(s), SQL Type: sqlTypeOther, length: 255, nullable: true, editable: true)

Types:

ID: High
Name: High
Domains:

Templates:

Name: High
Description:
Drawing Tool: esriFeatureEditToolPoint
Prototype:

Attributes:

• HAZARD_POTENTIAL_CLASSIFICATION: High

---

ID: Significant
Name: Significant
Domains:

Templates:

Name: Significant
Description:
Drawing Tool: esriFeatureEditToolPoint
Prototype:

Attributes:

• HAZARD_POTENTIAL_CLASSIFICATION: Significant

---

ID: Low
Name: Low
Domains:

Templates:

Name: Low
Description:
Drawing Tool: esriFeatureEditToolPoint
Prototype:

Attributes:

• HAZARD_POTENTIAL_CLASSIFICATION: Low

---

ID: N/A
Name: N/A or Under review
Domains:

Templates:

Name: N/A
Description:
Drawing Tool: esriFeatureEditToolPoint
Prototype:

Attributes:

• HAZARD_POTENTIAL_CLASSIFICATION: N/A

---

ID: Under review
Name: N/A or Under review
Domains:

Templates:

Name: Under review
Description:
Drawing Tool: esriFeatureEditToolPoint
Prototype:

Attributes:

• HAZARD_POTENTIAL_CLASSIFICATION: Under review

---

ID: Removed/Breached
Name: Removed/Breached
Domains:

Templates:

Name: Removed/Breached
Description:
Drawing Tool: esriFeatureEditToolPoint
Prototype:

Attributes:

• HAZARD_POTENTIAL_CLASSIFICATION: Removed/Breached

---


Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 5/14/2026 11:50:55 PM

Schema Last Edit Date: 5/14/2026 11:50:55 PM

Data Last Edit Date: 4/30/2026 3:55:19 PM