United States Army Corps of Engineers Locations API
USACE location data including dams, reservoirs, streamgages, and sites
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OpenAPI Specification
openapi: 3.2.0
info:
title: CWMS Data Basins Locations API
description: The Corps Water Management System (CWMS) Data API provides a RESTful interface for accessing water management data from the U.S. Army Corps of Engineers. This includes time series data, locations, levels, ratings, forecasts, projects, turbines, gates, and water supply information for USACE-managed water resources across the United States.
version: 3.0.0
contact:
name: USACE CWMS Data API Support
url: https://github.com/USACE/cwms-data-api
license:
name: MIT
url: https://github.com/USACE/cwms-data-api/blob/develop/LICENSE.md
x-tags:
- Water Management
- Federal Government
- Hydrology
- Engineering
servers:
- url: https://cwms-data.usace.army.mil/cwms-data
description: Production CWMS Data API
- url: https://water.usace.army.mil/cwms-data
description: Water Data Platform
tags:
- name: Locations
description: USACE location data including dams, reservoirs, streamgages, and sites
paths:
/locations:
get:
operationId: getLocations
summary: Get Locations
description: Returns location data for USACE-managed sites including dams, reservoirs, stream gages, and other water resource facilities.
tags:
- Locations
parameters:
- name: office
in: query
required: false
description: Three-character USACE district office code
schema:
type: string
- name: names
in: query
required: false
description: Comma-separated list of location names (supports CWMS wildcards)
schema:
type: string
- name: unit
in: query
required: false
description: Measurement unit system (EN for English, SI for metric)
schema:
type: string
enum:
- EN
- SI
- name: datum
in: query
required: false
description: Vertical datum for elevation values (NAVD88, NGVD29, etc.)
schema:
type: string
- name: format
in: query
required: false
description: Response format
schema:
type: string
enum:
- json
- xml
- tab
- csv
responses:
'200':
description: Location data
content:
application/json:
schema:
$ref: '#/components/schemas/LocationsResponse'
'400':
$ref: '#/components/responses/BadRequest'
post:
operationId: createLocation
summary: Create Location
description: Creates a new location record in CWMS. Requires authentication.
tags:
- Locations
security:
- bearerAuth: []
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/Location'
responses:
'200':
description: Location created successfully
'400':
$ref: '#/components/responses/BadRequest'
'401':
$ref: '#/components/responses/Unauthorized'
/locations/{location-id}:
get:
operationId: getLocation
summary: Get Location
description: Returns data for a specific USACE location.
tags:
- Locations
parameters:
- name: location-id
in: path
required: true
description: The CWMS location identifier
schema:
type: string
- name: office
in: query
required: false
description: Three-character USACE district office code
schema:
type: string
- name: unit
in: query
required: false
description: Measurement unit system (EN or SI)
schema:
type: string
responses:
'200':
description: Location data
content:
application/json:
schema:
$ref: '#/components/schemas/Location'
'404':
$ref: '#/components/responses/NotFound'
patch:
operationId: updateLocation
summary: Update Location
description: Updates an existing location record. Requires authentication.
tags:
- Locations
security:
- bearerAuth: []
parameters:
- name: location-id
in: path
required: true
description: The CWMS location identifier
schema:
type: string
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/Location'
responses:
'200':
description: Location updated successfully
'401':
$ref: '#/components/responses/Unauthorized'
'404':
$ref: '#/components/responses/NotFound'
delete:
operationId: deleteLocation
summary: Delete Location
description: Deletes a location record. Requires authentication.
tags:
- Locations
security:
- bearerAuth: []
parameters:
- name: location-id
in: path
required: true
description: The CWMS location identifier
schema:
type: string
- name: office
in: query
required: true
description: Three-character USACE district office code
schema:
type: string
responses:
'200':
description: Location deleted successfully
'401':
$ref: '#/components/responses/Unauthorized'
'404':
$ref: '#/components/responses/NotFound'
components:
responses:
NotFound:
description: The requested resource was not found
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
Unauthorized:
description: Authentication required
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
BadRequest:
description: Bad request — invalid parameters or missing required fields
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
schemas:
Location:
type: object
properties:
name:
type: string
description: The CWMS location identifier
office-id:
type: string
description: Three-character USACE district office code
latitude:
type: number
format: double
description: Decimal latitude (WGS84)
longitude:
type: number
format: double
description: Decimal longitude (WGS84)
elevation:
type: number
format: double
description: Elevation in the specified datum and unit
horizontal-datum:
type: string
description: Horizontal datum (e.g., WGS84, NAD83)
vertical-datum:
type: string
description: Vertical datum (e.g., NAVD88, NGVD29)
elevation-units:
type: string
description: Unit of elevation measurement
public-name:
type: string
description: Public-facing name of the location
long-name:
type: string
description: Long descriptive name
description:
type: string
description: Description of the location
kind:
type: string
description: Location kind (SITE, STREAM_LOCATION, PROJECT, etc.)
type:
type: string
description: Location type
state-initial:
type: string
description: Two-character U.S. state abbreviation
county-name:
type: string
description: County name
timezone-name:
type: string
description: IANA timezone name
nation:
type: string
description: Nation code (e.g., US)
nearest-city:
type: string
description: Nearest city name
LocationsResponse:
type: object
properties:
locations:
type: object
properties:
location:
type: array
items:
$ref: '#/components/schemas/Location'
Error:
type: object
properties:
message:
type: string
description: Human-readable error description
status:
type: integer
description: HTTP status code
securitySchemes:
bearerAuth:
type: http
scheme: bearer
description: JWT Bearer token for authenticated operations (create, update, delete). Obtain a token from the CWMS authorization endpoint.