View In:   ArcGIS Online Map Viewer

Name: Drainages

Display Field: name

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: The subbasin delineations were based off Napa County"s prior planning subbasins (https://www.napacounty.gov/DocumentCenter/View/2635/Napa-County-Watershed-Map-PDF?bidId=).This layer was made by Environmental Science Associates (ESA) as part of Napa County"s 2025 Baseline Data Report.High quality Digital Elevation Model's (DEM) were combined to fully delineate subbasins. The Napa County Streams layer was used to burn streams into the DEM to ensure that subbasin delineations were consistent with the County"s streams layer.Raw catchments generated with the ArcGIS Pro hydrology toolset were subsequently merged together as necessary to adhere to original planning drainages. In cases where planning drainages were subdivided in greater detail then was delineated in the raw catchment layer, ESA defined pour points to manually delineate planning drainages using the "Subwatershed Delineation" geoprocessing tool. ESA worked with the County to identify areas requiring additional refinement, and further refined delineation based on a review of the delineation against satellite imagery, Google Earth Street View, and the DEM"s contour/ hillshade.

Service Item Id: af2c669e2d1543d89507562b0ae454d4

Copyright Text: ESA, 2026; Napa County, 2026

Default Visibility: true

MaxRecordCount: 2000

MaxSelectionCount: 0

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 0.0

Max Scale: 0.0

Supports Advanced Queries: true

Supports Statistics: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports ValidateSQL: true

Supports Calculate: true

Extent:

XMin: 6376893.560643584
YMin: 1814976.0678726882
XMax: 6544068.149850175
YMax: 2076581.515789345
Spatial Reference: 102642  (2226)  LatestVCSWkid(0)

Drawing Info:

Renderer:
Simple Renderer:
Symbol:
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Color: [230, 252, 204, 255]
Outline:
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Label: N/A
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Transparency: 0
Labeling Info:

Feature Draw Order:

N/A

Advanced Query Capabilities:

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Supports Sql Expression: true
Supports Query With ResultType: true
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Supports Query With LOD Spatial Reference: true
Supports Percentile Statistics: true
Supports Having Clause: true
Supports Count Distinct: true
Supports Time Relation: false
Supports Sql Format: false
Supports Query Analytic: true
Supports Query With Current User: true

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field:

Fields:

• objectid ( nullable: false, defaultValue: null, editable: false, length: 4, type: esriFieldTypeOID, modelName: objectid, alias: OBJECTID )
• name ( modelName: name, nullable: true, editable: true, defaultValue: null, length: 254, alias: Name, type: esriFieldTypeString )
• watershed ( modelName: watershed, nullable: true, editable: true, defaultValue: null, length: 254, alias: Watershed, type: esriFieldTypeString )
• area_sqmi ( modelName: area_sqmi, nullable: true, editable: true, defaultValue: null, alias: Area_sqmi, type: esriFieldTypeDouble )
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• SHAPE__Area ( virtual: true, nullable: true, editable: false, defaultValue: null, alias: SHAPE__Area, type: esriFieldTypeDouble )

Templates:

• Name: Drainages
  Description:
  Prototype:
  watershed: null
  name: null
  perimeter_: null
  area_sqmi: null
  shape_leng: null
  
  Drawing Tool: esriFeatureEditToolPolygon

Capabilities: Query

Sync Can Return Changes: true

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Supports Rollback On Failure: true

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Supports Query With Historic Moment: false

Supports Coordinates Quantization: true

Child Resources:

Supported Operations:   Query   Query Attachments   Query Analytic   Query Top Features   Query Bins   Append   Validate SQL   Generate Renderer   Return Updates   Metadata   Update Metadata