How coverage works
A gauge and a waterbody are not the same thing
Each relationship stores its type, distance, direction when relevant, confidence, provenance, and a plain-language limitation.
Review matching methodologyCoverage with useful data
Maryland rivers
Only waters with a defensible identity, explainable station relationship, and useful source-backed information belong in this directory.
Map and accessible list
Monitored waters
Launch coverage—selected for geographic and parameter variety. This is not a fabricated popularity ranking.
Map exploration
Configure a licensed MapLibre style URL to enable the interactive map.
The accessible location list remains available below the map.
Crawl quality
No empty page factory
Search filters, map bounds, units, and chart periods remain out of the sitemap. Only canonical pages with real source-backed value are indexable.
Read coverage policy