USGS Water Data APIs
The USGS Water Data OGC API — an OGC API Features service declaring 18 conformance classes, including OGC API Common Parts 1-3, Features Parts 1-4 and CQL2 filtering, and serving 37 collections. Verified live 2026-08-30: /conformance returns the class URIs, /collections returns 37 entries, and the landing page advertises a first-party OpenAPI 3.0.2 with 189 paths at its service-desc link. A control path on the same host returns 404, so the host discriminates and the 200s are evidence rather than a catch-all. The live /conformance endpoint is NOT registered as a property: `Conformance` is the local artifact type (5,889 providers use it for conformance/*.yml on disk), and there is no pointer class meaning a live OGC conformance endpoint. That gap is roadmap#80's failure mode 3, and overloading an existing type to work around it would hide the gap rather than record it. The classes are captured in conformance/ with their source URL.
USGS Water Data APIs is one of 47 APIs that U.S. Geological Survey publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
Tagged areas include Water, Geospatial, OGC, and OGC API Features. The published artifact set on APIs.io includes an OpenAPI specification and API documentation.
Requests are made against the base URL https://api.waterdata.usgs.gov/ogcapi/v0.
Metadata
The identity and technical contract details declared by the specification.
Specification
The full machine-readable OpenAPI contract behind this narrative.
Source
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