mcp · United States

USGS National Map MCP

MCP Server for the USGS National Map APIs

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What's in it

Data offered docs-verified: streams, rivers and canals with stream order, drainage area, slope, elevation, modelled flow (qama, cfs) and velocity (vama, fps) · lakes, ponds, reservoirs, swamps and areal water features (wide rivers, bays, rapids, dams) · stream gages with NWIS linkage and drainage area · springs, waterfalls, dams/weirs, gates, levees, wells and other water features · HUC12 watershed name, code, downstream HUC, type, area and states
Coverage docs-verified: United States
Formats docs-verified: MCP stdio · MCP HTTP (served at /mcp) · GeoJSON input geometry
Access docs-verified: Free, no authentication (public service); underlying USGS data is public domain

Useful for

Use cases llm-inferred: FRA baseline flows: find gauges within a buffered site polygon with hydro_find_gages and read drainage area (dasqmi) and NWIS linkage · Drainage strategy context: identify the HUC12 watershed and its downstream HUC for a site with hydro_identify_watershed · Watercourse and waterbody constraint mapping for planning or ecological screening using hydro_find_waterways and hydro_find_waterbodies · Outfall and culvert screening using modelled EROM flow and velocity from flowline attributes
Audience llm-inferred: flood consultants · hydrologists · drainage engineers · GIS analysts · ecologists · planners

Limitations

Constraints docs-verified: Each layer caps at 2000 records per request; results set truncated: true when the cap is hit · Feature geometry is not returned, so results are attributes only · Tools are geometry-intersection queries; routed upstream/downstream tracing is not yet implemented · Drainage-area units differ: gages use square miles (dasqmi), flowlines and watersheds use square km · Point and line layers need a Polygon or BoundingBox to reliably capture features · Covers the United States only

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Authentication: Unknown — review source docs
GitHub stars: 0
Last commit: 12/08/2026
Last successful page check: 14/10/2026
Page health: healthy
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Verification: Not independently verified

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Metadata observed 14/10/2026 · editorial seed