United States Army Corps of Engineers

The U.S. Army Corps of Engineers (USACE) provides engineering and construction services for the nation, managing water resources, infrastructure, and environmental projects. USACE operates the Corps Water Management System (CWMS) Data API, a RESTful service for accessing real-time and historical water management data including time series measurements, location information, ratings, forecasts, and project data for USACE-managed water resources across the United States.

United States Army Corps of Engineers publishes 10 APIs on the APIs.io network, including Basins API, Catalog API, Forecasts API, and 7 more. Tagged areas include Engineering, Federal-Government, Water Resources, Hydrology, and Civil Engineering.

The United States Army Corps of Engineers catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

United States Army Corps of Engineers’ developer surface includes authentication, GitHub presence, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub

41.9/100 developing ▬ flat Agent 20/100 agent aware self hosted · MIT Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs

Engineering Federal-Government Water Resources Hydrology Civil Engineering

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 41.9/100 · developing

Contract Quality 10.1 / 16

Developer Ergonomics 2.8 / 13

Access Clarity 2.1 / 13

Operational Transparency 2.4 / 8

Contract Governance 4.3 / 8

Discoverability 4.5 / 7

Regulatory Posture 4.7 / 15

Open Source Surface 5.0 / 10

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Government & Public Sector regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 65 points between them, because both conditional facets apply and carry 35 points together. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 65% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/united-states-army-corps-of-engineers: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 10

Individual APIs this provider publishes, each with its own machine-readable definition.

United States Army Corps of Engineers Basins API

River basin information

United States Army Corps of Engineers Catalog API

Browse available data in the CWMS catalog

United States Army Corps of Engineers Forecasts API

Forecast instances and specifications

United States Army Corps of Engineers Levels API

Location levels and stage-discharge relationships

United States Army Corps of Engineers Locations API

USACE location data including dams, reservoirs, streamgages, and sites

United States Army Corps of Engineers Parameters API

Physical parameters and units

United States Army Corps of Engineers Projects API

USACE project management including locks, gates, turbines, and outlets

United States Army Corps of Engineers Ratings API

Rating tables for converting between measured values

United States Army Corps of Engineers Time Series API

Time series data retrieval and management

United States Army Corps of Engineers Version API

API version information

Scroll for all 10

Open Collections 12

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

CWMS Data API

OPEN COLLECTION

CWMS Data Basins API

OPEN COLLECTION

CWMS Data Basins Catalog API

OPEN COLLECTION

CWMS Data Basins Forecasts API

OPEN COLLECTION

CWMS Data Basins Levels API

OPEN COLLECTION

CWMS Data Basins Locations API

OPEN COLLECTION

CWMS Data Basins Parameters API

OPEN COLLECTION

CWMS Data Basins Projects API

OPEN COLLECTION

CWMS Data Basins Ratings API

OPEN COLLECTION

CWMS Data Basins Time Series API

OPEN COLLECTION

CWMS Data Basins Version API

OPEN COLLECTION

Scroll for all 12

Pricing Plans 1

Published pricing tiers and plan structures.

United States Army Corps Of Engineers Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

United States Army Corps Of Engineers Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

United States Army Corps Of Engineers Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

United States Army Corps Of Engineers Context

4 classes · 24 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

United States Army Corps of Engineers API Rules

9 rules · 1 errors 7 warnings 1 info

SPECTRAL

United States Army Corps of Engineers API Rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

CWMS Location

18 properties

JSON SCHEMA

CWMS Time Series

10 properties

JSON SCHEMA

JSON Structure 2

JSON Structure definitions describing this provider's data shapes.

Cwms Data Api Location Structure

0 properties

JSON STRUCTURE

Cwms Data Api Timeseries Structure

0 properties

JSON STRUCTURE

Examples 3

Example request and response payloads for these APIs.

Cwms Data Api Getcatalog Example

2 fields

EXAMPLE

Cwms Data Api Getlocations Example

2 fields

EXAMPLE

Cwms Data Api Gettimeseries Example

2 fields

EXAMPLE

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

United States Army Corps Of Engineers Authentication

http · 1 scheme

SECURITY

United States Army Corps Of Engineers Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

United States Army Corps Of Engineers Agentic Access

20 operations · 3 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 2

SDKs, sample code, and the tooling you integrate with

DigitalLibrary

DigitalLibrary

GitHub

GitHub

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

IssueTracker

IssueTracker

Releases

Releases

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 2

The organization behind the API

LinkedIn

Website

Website

Other 4

Properties that don't map to a standard resource type

OpenData

GeospatialData

WaterData

PermitsData

Source (apis.yml)

aid: united-states-army-corps-of-engineers
name: United States Army Corps of Engineers
description: The U.S. Army Corps of Engineers (USACE) provides engineering and construction services for the nation, managing
  water resources, infrastructure, and environmental projects. USACE operates the Corps Water Management System (CWMS) Data
  API, a RESTful service for accessing real-time and historical water management data including time series measurements,
  location information, ratings, forecasts, and project data for USACE-managed water resources across the United States.
deliveryModel:
  model: self-hosted
  license: MIT
  open_source: true
  commercial: false
  callable_host: true
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/united-states-army-corps-of-engineers.png
url: https://raw.githubusercontent.com/api-evangelist/united-states-army-corps-of-engineers/refs/heads/main/apis.yml
type: Index
created: '2024-12-25'
modified: '2026-05-19'
specificationVersion: '0.23'
tags:
- Engineering
- Federal-Government
- Water Resources
- Hydrology
- Civil Engineering
tags_raw:
- Engineering
- Federal Government
- Water Resources
- Hydrology
- Civil Engineering
apis:
- aid: united-states-army-corps-of-engineers:united-states-army-corps-of-engineers-basins-api
  name: United States Army Corps of Engineers Basins API
  description: River basin information
  humanURL: https://cwms-data.usace.army.mil/cwms-data/
  baseURL: https://cwms-data.usace.army.mil/cwms-data
  tags:
  - Basins
  properties:
  - type: OpenAPI
    url: openapi/united-states-army-corps-of-engineers-basins-api-openapi.yml
  - type: Documentation
    url: https://cwms-data.usace.army.mil/cwms-data/
  - type: GitHubRepository
    url: https://github.com/USACE/cwms-data-api
  - type: SwaggerUI
    url: https://cwms-data.usace.army.mil/cwms-data/swagger-ui.html
- aid: united-states-army-corps-of-engineers:united-states-army-corps-of-engineers-catalog-api
  name: United States Army Corps of Engineers Catalog API
  description: Browse available data in the CWMS catalog
  humanURL: https://cwms-data.usace.army.mil/cwms-data/
  baseURL: https://cwms-data.usace.army.mil/cwms-data
  tags:
  - Catalog
  properties:
  - type: OpenAPI
    url: openapi/united-states-army-corps-of-engineers-catalog-api-openapi.yml
  - type: Documentation
    url: https://cwms-data.usace.army.mil/cwms-data/
  - type: GitHubRepository
    url: https://github.com/USACE/cwms-data-api
  - type: SwaggerUI
    url: https://cwms-data.usace.army.mil/cwms-data/swagger-ui.html
- aid: united-states-army-corps-of-engineers:united-states-army-corps-of-engineers-forecasts-api
  name: United States Army Corps of Engineers Forecasts API
  description: Forecast instances and specifications
  humanURL: https://cwms-data.usace.army.mil/cwms-data/
  baseURL: https://cwms-data.usace.army.mil/cwms-data
  tags:
  - Forecast
  tags_raw:
  - Forecasts
  properties:
  - type: OpenAPI
    url: openapi/united-states-army-corps-of-engineers-forecasts-api-openapi.yml
  - type: Documentation
    url: https://cwms-data.usace.army.mil/cwms-data/
  - type: GitHubRepository
    url: https://github.com/USACE/cwms-data-api
  - type: SwaggerUI
    url: https://cwms-data.usace.army.mil/cwms-data/swagger-ui.html
- aid: united-states-army-corps-of-engineers:united-states-army-corps-of-engineers-levels-api
  name: United States Army Corps of Engineers Levels API
  description: Location levels and stage-discharge relationships
  humanURL: https://cwms-data.usace.army.mil/cwms-data/
  baseURL: https://cwms-data.usace.army.mil/cwms-data
  tags:
  - Levels
  properties:
  - type: OpenAPI
    url: openapi/united-states-army-corps-of-engineers-levels-api-openapi.yml
  - type: Documentation
    url: https://cwms-data.usace.army.mil/cwms-data/
  - type: GitHubRepository
    url: https://github.com/USACE/cwms-data-api
  - type: SwaggerUI
    url: https://cwms-data.usace.army.mil/cwms-data/swagger-ui.html
- aid: united-states-army-corps-of-engineers:united-states-army-corps-of-engineers-locations-api
  name: United States Army Corps of Engineers Locations API
  description: USACE location data including dams, reservoirs, streamgages, and sites
  humanURL: https://cwms-data.usace.army.mil/cwms-data/
  baseURL: https://cwms-data.usace.army.mil/cwms-data
  tags:
  - Locations
  properties:
  - type: OpenAPI
    url: openapi/united-states-army-corps-of-engineers-locations-api-openapi.yml
  - type: Documentation
    url: https://cwms-data.usace.army.mil/cwms-data/
  - type: GitHubRepository
    url: https://github.com/USACE/cwms-data-api
  - type: SwaggerUI
    url: https://cwms-data.usace.army.mil/cwms-data/swagger-ui.html
- aid: united-states-army-corps-of-engineers:united-states-army-corps-of-engineers-parameters-api
  name: United States Army Corps of Engineers Parameters API
  description: Physical parameters and units
  humanURL: https://cwms-data.usace.army.mil/cwms-data/
  baseURL: https://cwms-data.usace.army.mil/cwms-data
  tags:
  - Parameters
  properties:
  - type: OpenAPI
    url: openapi/united-states-army-corps-of-engineers-parameters-api-openapi.yml
  - type: Documentation
    url: https://cwms-data.usace.army.mil/cwms-data/
  - type: GitHubRepository
    url: https://github.com/USACE/cwms-data-api
  - type: SwaggerUI
    url: https://cwms-data.usace.army.mil/cwms-data/swagger-ui.html
- aid: united-states-army-corps-of-engineers:united-states-army-corps-of-engineers-projects-api
  name: United States Army Corps of Engineers Projects API
  description: USACE project management including locks, gates, turbines, and outlets
  humanURL: https://cwms-data.usace.army.mil/cwms-data/
  baseURL: https://cwms-data.usace.army.mil/cwms-data
  tags:
  - Project
  tags_raw:
  - Projects
  properties:
  - type: OpenAPI
    url: openapi/united-states-army-corps-of-engineers-projects-api-openapi.yml
  - type: Documentation
    url: https://cwms-data.usace.army.mil/cwms-data/
  - type: GitHubRepository
    url: https://github.com/USACE/cwms-data-api
  - type: SwaggerUI
    url: https://cwms-data.usace.army.mil/cwms-data/swagger-ui.html
- aid: united-states-army-corps-of-engineers:united-states-army-corps-of-engineers-ratings-api
  name: United States Army Corps of Engineers Ratings API
  description: Rating tables for converting between measured values
  humanURL: https://cwms-data.usace.army.mil/cwms-data/
  baseURL: https://cwms-data.usace.army.mil/cwms-data
  tags:
  - Ratings
  properties:
  - type: OpenAPI
    url: openapi/united-states-army-corps-of-engineers-ratings-api-openapi.yml
  - type: Documentation
    url: https://cwms-data.usace.army.mil/cwms-data/
  - type: GitHubRepository
    url: https://github.com/USACE/cwms-data-api
  - type: SwaggerUI
    url: https://cwms-data.usace.army.mil/cwms-data/swagger-ui.html
- aid: united-states-army-corps-of-engineers:united-states-army-corps-of-engineers-time-series-api
  name: United States Army Corps of Engineers Time Series API
  description: Time series data retrieval and management
  humanURL: https://cwms-data.usace.army.mil/cwms-data/
  baseURL: https://cwms-data.usace.army.mil/cwms-data
  tags:
  - Time Series
  properties:
  - type: OpenAPI
    url: openapi/united-states-army-corps-of-engineers-time-series-api-openapi.yml
  - type: Documentation
    url: https://cwms-data.usace.army.mil/cwms-data/
  - type: GitHubRepository
    url: https://github.com/USACE/cwms-data-api
  - type: SwaggerUI
    url: https://cwms-data.usace.army.mil/cwms-data/swagger-ui.html
- aid: united-states-army-corps-of-engineers:united-states-army-corps-of-engineers-version-api
  name: United States Army Corps of Engineers Version API
  description: API version information
  humanURL: https://cwms-data.usace.army.mil/cwms-data/
  baseURL: https://cwms-data.usace.army.mil/cwms-data
  tags:
  - Version
  properties:
  - type: OpenAPI
    url: openapi/united-states-army-corps-of-engineers-version-api-openapi.yml
  - type: Documentation
    url: https://cwms-data.usace.army.mil/cwms-data/
  - type: GitHubRepository
    url: https://github.com/USACE/cwms-data-api
  - type: SwaggerUI
    url: https://cwms-data.usace.army.mil/cwms-data/swagger-ui.html
common:
- type: IssueTracker
  url: https://github.com/USACE/cwms-data-api/issues
- type: Releases
  url: https://github.com/USACE/cwms-data-api/releases
- type: ContributionGuide
  url: https://github.com/USACE/cwms-data-api/blob/develop/CONTRIBUTING.md
- type: License
  name: MIT
  url: https://github.com/USACE/cwms-data-api/blob/develop/LICENSE
- type: AgenticAccess
  url: agentic-access/united-states-army-corps-of-engineers-agentic-access.yml
- type: DomainSecurity
  url: security/united-states-army-corps-of-engineers-domain-security.yml
- type: Authentication
  url: authentication/united-states-army-corps-of-engineers-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/us-army-corps-of-engineers
- type: Website
  url: https://www.usace.army.mil/
- type: OpenData
  url: https://www.usace.army.mil/open/
- type: GeospatialData
  url: https://geospatial-usace.opendata.arcgis.com/
- type: WaterData
  url: https://water.usace.army.mil/data
- type: DigitalLibrary
  url: https://usace.contentdm.oclc.org/
- type: GitHub
  url: https://github.com/USACE
- type: PermitsData
  url: https://permits.ops.usace.army.mil/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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