Sources

Each place page includes manager links and a verification date.

Access and maps

California State Parks ↗ — park pages, restriction panels, accessibility records, and maps.
Humboldt County Parks ↗ — county-managed river access.
City of Rio Dell ↗ — Edwards Drive river access.
OpenStreetMap contributors ↗ — ODbL coordinates, tiles, and local river centerlines; snapshot September 8, 2026.

Conditions

National Weather Service Eureka ↗ — official forecasts.
USGS Water Services ↗ — provisional flow and gauge height at Leggett, Miranda, and Scotia.
California FHABS data ↗ — bloom reports, cases, responses, and results; data snapshot September 4, 2026.
California HAB Reports Map ↗ — mapped reports and advisory details.
Humboldt County Environmental Health ↗ — regional guidance issued July 24, 2026.