Why Tributary Names Matter for Planners
A planning report that references "the creek north of the subject lands" is imprecise enough to cause problems in subsequent regulatory filings. Agencies issuing permits under provincial water and fisheries legislation expect watercourse names that match the authoritative geographic names database. Using the wrong name — or an informal local nickname — can delay permit applications and create ambiguity in legal descriptions.
The authoritative record for geographic names in Canada is maintained by the Canadian Geographical Names Database (CGNDB), operated by Natural Resources Canada. The database is publicly searchable and distinguishes between official names, variant names, and historical names.
The Generic Term Hierarchy
In Canadian naming practice, a watercourse name consists of a specific element (the identifying word or phrase) and a generic element (the category of watercourse). The choice of generic element is not arbitrary — it reflects convention about watercourse size, drainage area, and regional usage.
| Generic Term | General Usage in Canada | Regional Notes |
|---|---|---|
| River | Major named channel with significant discharge | Applied consistently across all provinces and territories |
| Creek | Smaller permanent watercourse, tributary of a river | Common in Ontario, BC, Prairies |
| Brook | Small permanent or semi-permanent watercourse | More common in Atlantic provinces |
| Ruisseau | Small stream (French) | Quebec and francophone areas of Ontario, NB |
| Rivière | River (French) | Quebec; used in official bilingual names in eastern Canada |
| Burn | Small stream | Rare; found in Cape Breton and some parts of Nova Scotia |
Indigenous Place Names in Watercourse Records
A significant number of river and creek names across Canada derive from Indigenous languages. Some were directly adopted into the official record; others were anglicised or translated; and many were replaced entirely during colonial settlement. In recent decades, some provinces and territories have moved to restore or officially recognise Indigenous names alongside or in place of colonial-era names.
The Yukon, for example, has formally reinstated a number of Dene and Southern Tutchone names for rivers within First Nations traditional territories, reflected in updated CGNDB records. In British Columbia, the BC Geographical Names Office maintains a protocol for First Nations name submissions.
When a planning document is being prepared within or adjacent to a First Nation's territory, contacting the relevant First Nations government to confirm preferred watercourse names is both a best practice and, in some jurisdictions, a duty-to-consult obligation. The official CGNDB entry may not yet reflect a recently approved Indigenous name.
Strahler Stream Order and Tributary Hierarchy
Stream order is a numerical classification that describes where a watercourse sits in the tributary hierarchy of a watershed. The most widely used system in Canadian hydrology is Strahler ordering, introduced by Arthur Strahler in 1952.
The rules are straightforward: a headwater stream with no tributaries is a first-order stream. Where two first-order streams meet, the resulting channel is second-order. Two second-order streams joining produce a third-order channel, and so on. The order increases only when two streams of the same order meet; a lower-order tributary joining a higher-order channel does not change the higher channel's order.
Stream order affects planning in several ways:
- Provincial fisheries regulations often specify different protection buffers depending on stream order (e.g., a 30-metre setback for a third-order fish-bearing stream versus a 15-metre setback for a first-order intermittent channel).
- Stormwater management design for a subdivision typically considers the stream order of the receiving watercourse when setting peak flow targets.
- Environmental impact assessments for projects crossing multiple tributaries will identify each crossing by stream order as part of the effects characterisation.
The CGNDB as a Planning Reference
The Canadian Geographical Names Database records both the official name and the geographic coordinates of the named watercourse. A search by feature type (selecting "watercourse" categories) within a bounding-box area will return all named streams within a defined study area. The results include the name in both official languages where applicable, the province or territory of jurisdiction, and the NTS sheet on which the feature appears.
Because the CGNDB uses NTS sheet references, cross-referencing a topographic map with the names database is straightforward. The name that appears on a printed or digital NTS sheet is the CGNDB official name at the time of that sheet's publication; updates to the database since the map's print date may reflect more recent name changes.
Informal and Legacy Names
In settled areas, local informal names for watercourses often differ from the official CGNDB entry. "The ditch behind the mall" or "Gravel Creek" as used by long-term residents may refer to a watercourse with an entirely different official name — or no official name at all. In either case, planning documents should use the CGNDB name where one exists. If a watercourse appears on NTS mapping but has no CGNDB entry, the document should describe it by its map reference and geographic coordinates rather than using an unofficial name.
Finding Name Records for a Specific Study Area
The CGNDB search interface at nrcan.gc.ca allows searches by name, by feature category, and by geographic region. The database can also be downloaded as a bulk dataset for integration into GIS projects. For a municipal planning study, the recommended workflow is:
- Identify the NTS sheet(s) covering the study area.
- Search the CGNDB filtered to the relevant province and feature categories "stream," "river," "creek," and "brook."
- Cross-reference results with the NTS blue-line network to confirm which named feature corresponds to which mapped channel.
- Flag any unnamed watercourses for description by coordinate reference.
- Note any discrepancies between the NTS printed name and the current CGNDB entry — the CGNDB is the authoritative source for documents submitted to provincial agencies.
Last reviewed: May 2026