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i12 Salinity Contours

Data represents maximum up-estuary intrusion of the 1 ppt salinity contour. The lines represent 1000 ppt chloride per million, measured 1½ hours after high tide. This data contains contours for 1921-1990.

Data files

Data title and descriptionAccess dataFile detailsLast updated

CSV

Download
CSV
07/18/25

Shapefile

DownloadZIP
07/18/25

GeoJSON

DownloadGEOJSON
07/18/25

KML

DownloadKML
07/18/25

Supporting files

Data title and descriptionAccess dataFile detailsLast updated

ArcGIS Hub Dataset

HTML
07/18/25

ArcGIS GeoService

ARCGIS GEOSERVICES REST API
07/18/25

API endpoint

Dataset Name

Use the query web API to retrieve data with a set of basic parameters. Copy the API endpoint you need to start.

Usage documentation