Ontario Integrated Hydrology (OIH) Data

A collection of related elevation and mapped water features used to generate watersheds and support provincial-scale hydrology applications.

Click a region in Map Viewer above or use the text links below to download. The region will also show the "Effective Date" or the date when the data was last processed.   Ontario Integrated Hydrology (OIH) Data is used to generate watersheds and support provincial-scale hydrology applications like:
  • watershed generation
  • hydrologic modelling
  • watercourse network analysis
Five key datasets are included in each data package:
  • stream network (Enhanced Watercourse)
  • hydrology-enforced digital elevation model [DEM] (Enforced DEM)
  • flow direction grid (Enhanced Flow Direction)
  • raster representation of the stream network (StreamGrid)
  • water bodies on the stream network (Integrated Waterbodies)
Technical information OIH data is available for the entire province making it possible to create a watershed for any location in Ontario. This includes areas flowing in from neighbouring provinces and Minnesota with the following exceptions:
  • points on the international border that drain to Lake Superior, south of Pigeon River
  • points on the international border that drain the Great Lakes connecting channels and St. Lawrence River stateside
  • points along the Ottawa River that drain from Quebec.
Special Note: North West package The North West package contains hydrography data for the entire Rainy River Basin, an area which straddles the international border between Canada and the United States. The data stateside originates from the National Hydrography Dataset (NHD) as of February/March 2014. This data has been harmonized with the Ontario Hydro Network (OHN) to create the Enhanced Watercourse and Integrated Waterbody layers found within the North West package.   For more information on when the data was initially extracted and incorporated, refer to these fields stored in the attribute table of each vector layer in the geodatabase:
  • Effective Date (EFF_DATE)
  • Geometry Update Date (GEO_UPD_DT)
The data stateside is a static snapshot of NHD intended to support regional modeling. Please refer to the United States Geological Survey (USGS) website for the most current version of NHD.   Product Packages Additional Documentation Status Completed: Production of the data has been completed   Maintenance and Update Frequency Irregular: data is updated in intervals that are uneven in duration. Data is updated after the completion of major updates to source data (eg. OHN and/or PDEM).   Contact Ontario Ministry of Natural Resources - Geospatial Ontario, [email protected] 

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Additional Info

Field Value
Last Updated August 26, 2026, 09:02 (UTC)
Created March 24, 2026, 20:42 (UTC)
Domain / Topic
Domain or topic of the dataset being cataloged.
Title
Title for the Dataset.
Ontario Integrated Hydrology (OIH) Data
Description
A description of the dataset.

A collection of related elevation and mapped water features used to generate watersheds and support provincial-scale hydrology applications.

Click a region in Map Viewer above or use the text links below to download. The region will also show the "Effective Date" or the date when the data was last processed.   Ontario Integrated Hydrology (OIH) Data is used to generate watersheds and support provincial-scale hydrology applications like:
  • watershed generation
  • hydrologic modelling
  • watercourse network analysis
Five key datasets are included in each data package:
  • stream network (Enhanced Watercourse)
  • hydrology-enforced digital elevation model [DEM] (Enforced DEM)
  • flow direction grid (Enhanced Flow Direction)
  • raster representation of the stream network (StreamGrid)
  • water bodies on the stream network (Integrated Waterbodies)
Technical information OIH data is available for the entire province making it possible to create a watershed for any location in Ontario. This includes areas flowing in from neighbouring provinces and Minnesota with the following exceptions:
  • points on the international border that drain to Lake Superior, south of Pigeon River
  • points on the international border that drain the Great Lakes connecting channels and St. Lawrence River stateside
  • points along the Ottawa River that drain from Quebec.
Special Note: North West package The North West package contains hydrography data for the entire Rainy River Basin, an area which straddles the international border between Canada and the United States. The data stateside originates from the National Hydrography Dataset (NHD) as of February/March 2014. This data has been harmonized with the Ontario Hydro Network (OHN) to create the Enhanced Watercourse and Integrated Waterbody layers found within the North West package.   For more information on when the data was initially extracted and incorporated, refer to these fields stored in the attribute table of each vector layer in the geodatabase:
  • Effective Date (EFF_DATE)
  • Geometry Update Date (GEO_UPD_DT)
The data stateside is a static snapshot of NHD intended to support regional modeling. Please refer to the United States Geological Survey (USGS) website for the most current version of NHD.   Product Packages Additional Documentation Status Completed: Production of the data has been completed   Maintenance and Update Frequency Irregular: data is updated in intervals that are uneven in duration. Data is updated after the completion of major updates to source data (eg. OHN and/or PDEM).   Contact Ontario Ministry of Natural Resources - Geospatial Ontario, [email protected] 
Tags / Keywords
Keywords/tags categorizing the dataset.
Format (CSV, XLS, TXT, PDF, etc)
File format of the dataset.
Dataset Size
Dataset size in megabytes.
3.83
Metadata Identifier
Metadata identifier – can be used as the unique identifier for catalogue entry
dc6da6816e2446279210668718af91c9
Published Date
Published date of the dataset.
2019-12-06
Time Period Data Span (start date)
Start date of the data in the dataset.
Time Period Data Span (end date)
End date of time data in the dataset.
GeoSpatial Area Data Span
A spatial region or named place the dataset covers.
Field Value
Access category
Type of access granted for the dataset (open, closed, service, etc).
public
License
License used to access the dataset.
Open Government Licence – Ontario
Limits on use
Limits on use of data.
Location
Location of the dataset.
https://ontariogeohub-lio.opendata.arcgis.com/datasets/mnrf::ontario-integrated-hydrology-oih-data
Data Service
Data service for accessing a dataset.
Owner
Owner of the dataset.
OntarioProvincialMapping
Contact Point
Who to contact regarding access?
Ontario Ministry of Natural Resources and Forestry
Contact Point Email
The email to contact regarding access?
[email protected]
Publisher
Publisher of the dataset.
Ontario Ministry of Natural Resources and Forestry
Publisher Email
Email of the publisher.
Author
Author of the dataset.
OntarioProvincialMapping
Author Email
Email of the author.
Accessed At
Date the data and metadata was accessed.
2026-08-13
Field Value
Identifier
Unique identifier for the dataset.
dc6da6816e2446279210668718af91c9
Language
Language(s) of the dataset
English
Link to dataset description
A URL to an external document describing the dataset.
https://ontariogeohub-lio.opendata.arcgis.com/datasets/mnrf::ontario-integrated-hydrology-oih-data
Persistent Identifier
Data is identified by a persistent identifier.
Globally Unique Identifier
Data is identified by a persistent and globally unique identifier.
Contains data about individuals
Does the data hold data about individuals?
Contains data about identifiable individuals
Does the data hold identifiable data about individual?
Contains Indigenous Data
Does the data hold data about Indigenous communities?
Portal Type
Platform type of the source portal.
Field Value
Version
Version of the datatset
None
Source
Source of the dataset.
None
Version notes
Version notes about the dataset.
Is version of another dataset
Link to dataset that it is a version of.
Other versions
Link to datasets that are versions of it.
Provenance Text
Provenance Text of the data.
Ontario Ministry of Natural Resources and Forestry
Provenance URL
Provenance URL of the data.
Temporal resolution
Describes how granular the date/time data in the dataset is.
GeoSpatial resolution in meters
Describes how granular (in meters) geospatial data is in the dataset.
GeoSpatial resolution (in regions)
Describes how granular (in regions) geospatial data is in the dataset.
Field Value
Indigenous Community Permission
Who holds the Indigenous Community Permission. Who to contact regarding access to a dataset that has data about Indigenous communities.
Community Permission
Community permission (who gave permission).
The Indigenous communities the dataset is about
Indigenous communities from which data is derived.
Field Value
Number of data rows
If tabular dataset, total number of rows.
Number of data columns
If tabular dataset, total number of unique columns.
Number of data cells
If tabular dataset, total number of cells with data.
Number of data relations
If RDF dataset, total number of triples.
Number of entities
If RDF dataset, total number of entities.
Number of data properties
If RDF dataset, total number of unique properties used by the triples.
Data quality
Describes the quality of the data in the dataset.
Metric for data quality
A metric used to measure the quality of the data, such as missing values or invalid formats.

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