# Mill Valley, CA king tide and flood history since 1996

> Since 1996, NOAA's San Francisco tide gauge has recorded water high enough for FloodRoute's model to put at least one Mill Valley road at risk on 1,517 days, about 50 a year. The highest water was 8.38 ft on Friday, February 6, 1998, 2.21 ft above the tide tables; at that level the model estimates 23 Mill Valley roads were at risk, including Ryan Avenue, Plymouth Avenue and Park Terrace. Those days have become more common: about 40 a year in 1996–2005, versus 61 a year in 2016–2025.

**Estimates, not records of actual flooding.** Each day is NOAA's verified high water at the tide gauge, run through FloodRoute's flood model on today's roads and elevations, in dry weather. Drains, levees, tide gates, rain, road changes and elevation error all mean real conditions differed. Not for property, real-estate, insurance, lending, engineering or legal decisions.

- Gauge: NOAA 9414290 (San Francisco), verified data Jan 1, 1996 – Sep 30, 2026
- Tide tables: NOAA 9414806 (Sausalito)
- Live forecast: [Mill Valley flood forecast](https://floodroute.com/ca/mill-valley.md)

## The biggest days

| Date | High water (San Francisco gauge, ft MLLW) | vs tide tables | Roads at risk | Severity | Deepest streets (model) |
|---|---|---|---|---|---|
| Feb 6, 1998 | 8.38 | +2.21 ft | 23 | Severe | Ryan Avenue, Plymouth Avenue, Park Terrace |
| Jan 3, 2026 | 8.38 | +1.25 ft | 23 | Severe | Ryan Avenue, Plymouth Avenue, Park Terrace |
| Jan 8, 2005 | 8.14 | +1.22 ft | 18 | Severe | Ryan Avenue, Plymouth Avenue, Park Terrace |
| Dec 24, 2003 | 8.12 | +1.01 ft | 18 | Severe | Ryan Avenue, Plymouth Avenue, Park Terrace |
| Dec 14, 2024 | 8.12 | +1.05 ft | 18 | Severe | Ryan Avenue, Plymouth Avenue, Park Terrace |
| Dec 31, 2005 | 8.09 | +1.13 ft | 14 | Severe | Ryan Avenue, Plymouth Avenue, Park Terrace |
| Jan 2, 2026 | 8.09 | +0.92 ft | 14 | Severe | Ryan Avenue, Plymouth Avenue, Park Terrace |
| Jan 10, 2001 | 8.07 | +0.96 ft | 14 | Severe | Ryan Avenue, Plymouth Avenue, Park Terrace |
| Jan 7, 2005 | 8.02 | +1.40 ft | 14 | Severe | Ryan Avenue, Plymouth Avenue, Park Terrace |
| Jan 1, 2006 | 8.00 | +1.10 ft | 14 | Severe | Ryan Avenue, Plymouth Avenue, Park Terrace |
| Feb 3, 1998 | 7.98 | +2.02 ft | 14 | Severe | Ryan Avenue, Plymouth Avenue, Park Terrace |
| Jan 4, 2026 | 7.94 | +1.02 ft | 14 | Severe | Ryan Avenue, Plymouth Avenue, Park Terrace |

## Most recent days

| Date | High water (San Francisco gauge, ft MLLW) | vs tide tables | Roads at risk | Severity | Deepest streets (model) |
|---|---|---|---|---|---|
| Sep 30, 2026 | 7.19 | +0.86 ft | 9 | Likely | Ryan Avenue, Plymouth Avenue, Park Terrace |
| Sep 29, 2026 | 7.11 | +0.80 ft | 1 | Likely | Sycamore Avenue |
| Sep 28, 2026 | 6.77 | +0.59 ft | 1 | Possible | Sycamore Avenue |
| Sep 27, 2026 | 6.63 | +0.67 ft | 1 | Possible | Sycamore Avenue |
| Sep 14, 2026 | 6.65 | +0.76 ft | 1 | Possible | Sycamore Avenue |
| Sep 11, 2026 | 6.76 | +0.71 ft | 1 | Possible | Sycamore Avenue |
| Sep 9, 2026 | 6.99 | +0.71 ft | 1 | Possible | Sycamore Avenue |
| Sep 8, 2026 | 7.05 | +0.66 ft | 1 | Possible | Sycamore Avenue |
| Sep 7, 2026 | 6.98 | +0.62 ft | 1 | Possible | Sycamore Avenue |
| Sep 6, 2026 | 6.76 | +0.51 ft | 1 | Possible | Sycamore Avenue |

## Days with roads at risk, by year

| Year | Days | Highest water at the gauge (ft) | Most roads at risk | Record |
|---|---|---|---|---|
| [1996](https://floodroute.com/ca/mill-valley/history/1996.md) | 29 | 7.53 | 13 | full |
| [1997](https://floodroute.com/ca/mill-valley/history/1997.md) | 62 | 7.70 | 13 | full |
| [1998](https://floodroute.com/ca/mill-valley/history/1998.md) | 58 | 8.38 | 23 | full |
| [1999](https://floodroute.com/ca/mill-valley/history/1999.md) | 17 | 7.19 | 9 | full |
| [2000](https://floodroute.com/ca/mill-valley/history/2000.md) | 31 | 7.24 | 9 | full |
| [2001](https://floodroute.com/ca/mill-valley/history/2001.md) | 32 | 8.07 | 14 | full |
| [2002](https://floodroute.com/ca/mill-valley/history/2002.md) | 43 | 7.46 | 10 | full |
| [2003](https://floodroute.com/ca/mill-valley/history/2003.md) | 38 | 8.12 | 18 | full |
| [2004](https://floodroute.com/ca/mill-valley/history/2004.md) | 47 | 7.41 | 9 | full |
| [2005](https://floodroute.com/ca/mill-valley/history/2005.md) | 42 | 8.14 | 18 | full |
| [2006](https://floodroute.com/ca/mill-valley/history/2006.md) | 63 | 8.00 | 14 | full |
| [2007](https://floodroute.com/ca/mill-valley/history/2007.md) | 33 | 7.10 | 1 | full |
| [2008](https://floodroute.com/ca/mill-valley/history/2008.md) | 40 | 7.40 | 10 | full |
| [2009](https://floodroute.com/ca/mill-valley/history/2009.md) | 49 | 7.42 | 10 | full |
| [2010](https://floodroute.com/ca/mill-valley/history/2010.md) | 51 | 7.62 | 13 | full |
| [2011](https://floodroute.com/ca/mill-valley/history/2011.md) | 49 | 7.67 | 13 | full |
| [2012](https://floodroute.com/ca/mill-valley/history/2012.md) | 41 | 7.63 | 13 | full |
| [2013](https://floodroute.com/ca/mill-valley/history/2013.md) | 26 | 7.28 | 9 | full |
| [2014](https://floodroute.com/ca/mill-valley/history/2014.md) | 59 | 7.77 | 14 | full |
| [2015](https://floodroute.com/ca/mill-valley/history/2015.md) | 76 | 7.58 | 13 | full |
| [2016](https://floodroute.com/ca/mill-valley/history/2016.md) | 58 | 7.56 | 13 | full |
| [2017](https://floodroute.com/ca/mill-valley/history/2017.md) | 48 | 7.64 | 13 | full |
| [2018](https://floodroute.com/ca/mill-valley/history/2018.md) | 53 | 7.49 | 10 | full |
| [2019](https://floodroute.com/ca/mill-valley/history/2019.md) | 75 | 7.54 | 13 | full |
| [2020](https://floodroute.com/ca/mill-valley/history/2020.md) | 59 | 7.27 | 9 | full |
| [2021](https://floodroute.com/ca/mill-valley/history/2021.md) | 55 | 7.45 | 10 | full |
| [2022](https://floodroute.com/ca/mill-valley/history/2022.md) | 47 | 7.54 | 13 | full |
| [2023](https://floodroute.com/ca/mill-valley/history/2023.md) | 97 | 7.66 | 13 | full |
| [2024](https://floodroute.com/ca/mill-valley/history/2024.md) | 19 | 8.12 | 18 | partial |
| [2025](https://floodroute.com/ca/mill-valley/history/2025.md) | 58 | 7.60 | 13 | full |
| [2026](https://floodroute.com/ca/mill-valley/history/2026.md) | 62 | 8.38 | 23 | partial |

## Method

For every day since 1996 we take NOAA's verified highest observed water at the tide gauge, adjust it to the town's prediction station exactly as the live forecast does (the gauge's departure from the tide tables, minus the departure already built into our calibration), and run FloodRoute's flood model on today's road network and street elevations. A day counts when at least one road in the town is at or below that water level by the model's rules. Rain is not included, so wet days were likely worse.

Data: [CSV](https://floodroute.com/data/history/ca/mill-valley.csv) · [JSON](https://floodroute.com/data/history/ca/mill-valley.json) · Open Database License (ODbL) 1.0 (https://opendatacommons.org/licenses/odbl/1-0/) · Credit: FloodRoute (floodroute.com), © OpenStreetMap contributors, NOAA CO-OPS · [All towns](https://floodroute.com/data.md)

## Frequently asked questions

### How often do roads flood at high tide in Mill Valley?

By FloodRoute's estimate, at least one Mill Valley road was at risk on 1,517 days between 1996 and Sep 30, 2026, about 50 a year. Those days have become more common: about 40 a year in 1996–2005, versus 61 a year in 2016–2025. Most of those days are shallow water on a few low streets; the [biggest days](https://floodroute.com/ca/mill-valley/history) put dozens of roads at risk.

### What was the highest tide in Mill Valley since 1996?

Friday, February 6, 1998: NOAA's San Francisco tide gauge recorded 8.38 ft (MLLW), 2.21 ft above the tide tables. At that level FloodRoute's model estimates 23 Mill Valley roads were at risk, including Ryan Avenue, Plymouth Avenue and Park Terrace.

### When did a high tide last put Mill Valley roads at risk?

The most recent day in the verified record is Wednesday, September 30, 2026: 7.19 ft at the San Francisco gauge, 9 roads at risk. NOAA verifies data with a lag of a month or two; the [live forecast](https://floodroute.com/ca/mill-valley) covers today and the weeks ahead.

### Is this a record of actual flooding in Mill Valley?

No. Estimates, not records of actual flooding. Each day is NOAA's verified high water at the tide gauge, run through FloodRoute's flood model on today's roads and elevations, in dry weather. Drains, levees, tide gates, rain, road changes and elevation error all mean real conditions differed. Not for property, real-estate, insurance, lending, engineering or legal decisions. Neighbor flood reports in the FloodRoute app are the ground truth we use to check and improve the model.

### Can I use this data?

Yes. Download it as [CSV](https://floodroute.com/data/history/ca/mill-valley.csv) or [JSON](https://floodroute.com/data/history/ca/mill-valley.json) under the Open Database License (ODbL) 1.0, with attribution to FloodRoute (floodroute.com), © OpenStreetMap contributors, NOAA CO-OPS. Please describe it as estimates, never as observed flooding. More on the [open data page](https://floodroute.com/data).

**Forecasts are estimates, not guarantees.** Never drive or walk through flood water: according to the National Weather Service, a foot of moving water can carry away most cars. Turn around, don’t drown. Always follow local authorities and official warnings.

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Web version: https://floodroute.com/ca/mill-valley/history · Site index for AI agents: https://floodroute.com/llms.txt · Every page is available as Markdown: add `.md` to its URL.

FloodRoute provides estimates only. Never drive or walk through flood water. © Axiomic, LLC · contact@axiomic.ai