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County
Allegheny County Hydrology Areas
Allegheny County / City of Pittsburgh / Western PA Regional Data Center —
The Hydrology Feature Dataset contains photogrammetrically compiled water drainage features and structures including rivers, streams, drainage canals, locks, dams,... -
County
Allegheny County Hydrology Lines
Allegheny County / City of Pittsburgh / Western PA Regional Data Center —
The Hydrology Feature Dataset contains photogrammetrically compiled water drainage features and structures including rivers, streams, drainage canals, locks, dams,... -
County
Perennial Streams
Fairfax County, Virginia —
Perennial streams in Fairfax County. Perennial streams are bodies of water flowing in a natural or man-made channel year-round, except during periods of drought.