# Boston king tides and high water in 1999

> In 1999, NOAA's Boston tide gauge recorded water high enough for FloodRoute's model to put at least one Boston road at risk on 16 days. The highest was 12.23 ft on Sunday, January 3, 1999, 0.75 ft above the tide tables, with 5 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 (16)

| Date | High water (Boston gauge, ft MLLW) | vs tide tables | Roads at risk | Severity | Deepest streets (model) |
|---|---|---|---|---|---|
| Jan 3, 1999 | 12.23 | +0.75 ft | 5 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Mar 1, 1999 | 11.78 | +1.25 ft | 2 | Possible | Chelsea Street |
| Apr 17, 1999 | 12.11 | +0.35 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Apr 18, 1999 | 12.02 | +0.07 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| May 16, 1999 | 11.85 | −0.34 ft | 2 | Possible | Chelsea Street |
| Jun 13, 1999 | 11.90 | −0.31 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jun 15, 1999 | 12.18 | −0.02 ft | 5 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jun 16, 1999 | 11.77 | −0.23 ft | 2 | Possible | Chelsea Street |
| Jul 14, 1999 | 11.90 | +0.03 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Sep 30, 1999 | 11.80 | +0.63 ft | 2 | Possible | Chelsea Street |
| Oct 27, 1999 | 11.91 | −0.04 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Nov 24, 1999 | 12.13 | −0.10 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Nov 26, 1999 | 11.88 | −0.02 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Dec 22, 1999 | 11.88 | −0.13 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Dec 23, 1999 | 12.00 | −0.17 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Dec 24, 1999 | 12.00 | −0.10 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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