Data · dataset · 2025
8 Digit Watersheds
Listed in Maryland Open Data Portal
This file (SWSUB8) is a statewide digital watershed file.
Description
It depicts the State with 138 separate watersheds each with an 8-digit numeric code. The file was created primarily for State and Federal agency use.
The creation of this file goes back many years and involved several State and Federal agencies. This file was derived from a more detailed watershed file (Maryland's Third-Order Watershed). The process used to create this file is consistent with the elevation contour information found on the US Geological Survey's 7.5 minute topographic quadrangle maps and the Maryland Department of the Environment's watershed location and naming conventions.
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This file is similar, but not identical, to the US Natural Resources Conservation Service's (NRCS) Hydrologic Unit Code (HUC11) watershed file. The watersheds define Strahler (Strahler 1952 p.1120) third order stream drainage by contours on U.S. Geological Survey (USGS) 7.5 minute quadrangle map sheets. Some watershed drainage areas were defined for streams less than third order and some large area Watersheds were split to maintain a maximum size of 15,000 acres.
Links
Get the data
- CSV opendata.maryland.gov/api/views/ncwy-crvd/rows.csv?accessType=DOWNLOAD ↗
download · from opendata maryland gov
Where it is published
- Maryland Open Data Portal dataset page opendata.maryland.gov/dataset/8-Digit-Watersheds/ncwy-crvd ↗
landing page · from opendata maryland gov
Catalogue records · 1
- SODA API opendata.maryland.gov/resource/ncwy-crvd.json ↗
metadata API · from opendata maryland gov
Topics
- From keywords
- Earth & Environmental Science · Hydrology · Ocean & Atmospheric Science
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| Maryland Open Data Portal | ncwy-crvd | 12 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · opendata maryland gov | connector:opendata_maryland_gov@1.0.0 | |
| concepts[field].local:field:earth-environmental | mapping · opendata maryland gov | connector:opendata_maryland_gov@1.0.0 | |
| concepts[field].local:field:ocean-atmospheric | mapping · opendata maryland gov | connector:opendata_maryland_gov@1.0.0 | |
| created_date | source · opendata maryland gov | connector:opendata_maryland_gov@1.0.0 | |
| description | source · opendata maryland gov | connector:opendata_maryland_gov@1.0.0 | /resource/description |
| publication_date | source · opendata maryland gov | connector:opendata_maryland_gov@1.0.0 | |
| title | source · opendata maryland gov | connector:opendata_maryland_gov@1.0.0 | /resource/name |
| updated_date | source · opendata maryland gov | connector:opendata_maryland_gov@1.0.0 |