Data

How close is your nearest creek?

Type a Mill Valley address to see the closest creek or stream, in feet. The map shows what runs above ground, what runs underground and how often the water flows.

Data pulled Oct 26, 2026
Above ground
Underground

Drag to pan. Scroll or pinch to zoom. Turn on Elevation lines at the top right to see how high the ground sits. Zoom in to see property lines, then tap any property to see its distance to the nearest creek or stream.

How to read the lines

  • Year-roundAbove ground. Flows through the dry season, except in a severe drought. Most of the named creeks run year-round for at least part of their length.
  • SeasonalAbove ground. Flows for part of the year, usually the wet months.
  • Rain onlyAbove ground. Carries water during and just after storms.
  • Storm pipesUnderground. Most people never see them, and many connect one open stretch of creek or stream to the next.

What stands out

    What this map cannot tell you

    The year-round, seasonal and rain-only labels come from federal mapping at a scale of 1 to 24,000 or finer, not from walking each creek. A rain-only line is a likely stream, not a guarantee, and a year-round line can still run dry in a drought.

    Many small creeks and streams carry no name in the data. A creek may be drawn as one unbroken line even where it runs through a pipe, and the underground pipe lines are not a full inventory of city drains.

    The map covers a limited area around Mill Valley and does not follow city limits or the ZIP code. Property lines come from the county parcel map and may differ from a survey. Distances run from the address point, not the edge of the house. This map shows where water is mapped. It is not a flood or landslide rating, and it cannot say whether a property is at risk.

    Sources