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Map Snow Trends Groundwater Providers Drought Compacts Transbasin Learn

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Every district is live. Districts marked machine-built were assembled from DWR's records without a person checking the network; three have been reviewed. Found something wrong? Use Report a problem on any page, and read the terms and disclaimers before treating any of this as operationally trustworthy.

Advisory reading aids on public DWR/USGS data — never administrative or legal conclusions. Everything on this site · How this is built · How much to trust it · Terms & disclaimers · Report a problem · Support this project · Contact · Bluesky · Hydrohistorian, a True Ascent Labs project.