# Boston king tides and high water in 2020

> In 2020, NOAA's Boston tide gauge recorded water high enough for FloodRoute's model to put at least one Boston road at risk on 45 days. The highest was 13.18 ft on Thursday, December 17, 2020, 1.91 ft above the tide tables, with 32 roads at risk, including Chelsea Street, William T. Morrissey Boulevard and Marginal Street.

**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.

## Every day with roads at risk (45)

| Date | High water (Boston gauge, ft MLLW) | vs tide tables | Roads at risk | Severity | Deepest streets (model) |
|---|---|---|---|---|---|
| Jan 13, 2020 | 11.77 | +0.53 ft | 2 | Possible | Chelsea Street |
| Feb 7, 2020 | 12.42 | +2.03 ft | 8 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Feb 11, 2020 | 12.25 | +0.73 ft | 5 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Mar 7, 2020 | 12.32 | +1.85 ft | 6 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Mar 9, 2020 | 11.94 | +0.49 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Mar 10, 2020 | 12.36 | +0.71 ft | 6 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Mar 11, 2020 | 11.98 | +0.38 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Mar 12, 2020 | 12.26 | +0.82 ft | 5 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Mar 13, 2020 | 12.30 | +0.90 ft | 6 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Apr 3, 2020 | 12.15 | +2.56 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Apr 7, 2020 | 12.48 | +1.04 ft | 10 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Apr 8, 2020 | 12.58 | +1.11 ft | 12 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Apr 9, 2020 | 12.91 | +1.11 ft | 22 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Apr 10, 2020 | 12.90 | +1.00 ft | 22 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Apr 11, 2020 | 12.16 | +0.44 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| May 5, 2020 | 11.91 | +0.57 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| May 6, 2020 | 12.49 | +0.70 ft | 10 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| May 7, 2020 | 11.92 | +0.91 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| May 8, 2020 | 12.82 | +0.82 ft | 16 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| May 9, 2020 | 12.78 | +0.83 ft | 16 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jun 3, 2020 | 12.18 | +0.73 ft | 5 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jun 4, 2020 | 12.10 | +0.38 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jun 5, 2020 | 12.33 | +0.54 ft | 6 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jun 7, 2020 | 12.33 | +0.67 ft | 6 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jun 8, 2020 | 11.84 | +0.47 ft | 2 | Possible | Chelsea Street |
| Jul 2, 2020 | 12.03 | +0.85 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jul 3, 2020 | 12.36 | +1.06 ft | 6 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jul 4, 2020 | 12.21 | +0.91 ft | 5 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jul 6, 2020 | 12.11 | +0.93 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Aug 20, 2020 | 11.82 | +0.44 ft | 2 | Possible | Chelsea Street |
| Sep 19, 2020 | 11.92 | +0.35 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Sep 22, 2020 | 12.75 | +1.52 ft | 14 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Oct 16, 2020 | 11.91 | +0.51 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Oct 17, 2020 | 12.07 | +0.15 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Oct 18, 2020 | 11.94 | −0.17 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Oct 19, 2020 | 11.93 | −0.12 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Nov 13, 2020 | 11.98 | +0.76 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Nov 14, 2020 | 12.12 | +0.33 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Nov 15, 2020 | 12.58 | +0.46 ft | 12 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Nov 16, 2020 | 12.62 | +0.43 ft | 12 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Nov 17, 2020 | 12.36 | +0.36 ft | 6 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Dec 5, 2020 | 11.91 | +2.04 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Dec 13, 2020 | 12.44 | +0.82 ft | 8 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Dec 14, 2020 | 12.82 | +0.97 ft | 16 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Dec 17, 2020 | 13.18 | +1.91 ft | 32 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |

[All Boston history](https://floodroute.com/ma/boston/history.md) · [Live forecast](https://floodroute.com/ma/boston.md)

Data: [CSV](https://floodroute.com/data/history/ma/boston.csv) · [JSON](https://floodroute.com/data/history/ma/boston.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)

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