# Boston king tides and high water in 2015

> In 2015, NOAA's Boston tide gauge recorded water high enough for FloodRoute's model to put at least one Boston road at risk on 31 days. The highest was 13.61 ft on Tuesday, January 27, 2015, 3.29 ft above the tide tables, with 61 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 (31)

| Date | High water (Boston gauge, ft MLLW) | vs tide tables | Roads at risk | Severity | Deepest streets (model) |
|---|---|---|---|---|---|
| Jan 21, 2015 | 11.80 | +0.07 ft | 2 | Possible | Chelsea Street |
| Jan 22, 2015 | 12.39 | +0.61 ft | 8 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jan 24, 2015 | 12.18 | +0.98 ft | 5 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jan 27, 2015 | 13.61 | +3.29 ft | 61 | Severe | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Feb 15, 2015 | 12.11 | +2.17 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Feb 18, 2015 | 12.36 | +0.83 ft | 6 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Feb 19, 2015 | 12.85 | +1.06 ft | 16 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Mar 21, 2015 | 11.96 | +0.32 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Mar 22, 2015 | 12.27 | +0.51 ft | 6 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Apr 18, 2015 | 12.09 | +0.27 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Apr 20, 2015 | 11.84 | −0.04 ft | 2 | Possible | Chelsea Street |
| Apr 21, 2015 | 12.52 | +0.82 ft | 10 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Apr 22, 2015 | 11.92 | +0.59 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| May 17, 2015 | 11.89 | +0.17 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| May 19, 2015 | 11.77 | +0.10 ft | 2 | Possible | Chelsea Street |
| May 20, 2015 | 11.85 | +0.40 ft | 2 | Possible | Chelsea Street |
| Jul 3, 2015 | 11.78 | +0.53 ft | 2 | Possible | Chelsea Street |
| Aug 1, 2015 | 12.06 | +0.50 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Aug 2, 2015 | 12.00 | +0.29 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Aug 3, 2015 | 11.94 | +0.26 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Aug 29, 2015 | 11.79 | +0.07 ft | 2 | Possible | Chelsea Street |
| Aug 31, 2015 | 12.03 | +0.18 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Sep 1, 2015 | 11.88 | +0.18 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Sep 2, 2015 | 11.95 | +0.31 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Sep 29, 2015 | 11.97 | −0.06 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Sep 30, 2015 | 12.43 | +0.38 ft | 8 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Oct 1, 2015 | 12.15 | +0.31 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Oct 2, 2015 | 12.08 | +0.65 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Oct 28, 2015 | 12.00 | −0.18 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Oct 29, 2015 | 12.66 | +0.58 ft | 14 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Dec 24, 2015 | 12.00 | +0.66 ft | 4 | Possible | 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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Web version: https://floodroute.com/ma/boston/history/2015 · Site index for AI agents: https://floodroute.com/llms.txt · Every page is available as Markdown: add `.md` to its URL.

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