Boston king tides and high water in 2009

In 2009, NOAA's Boston tide gauge recorded water high enough for FloodRoute's model to put at least one Boston road at risk on 36 days. The highest was 13.03 ft on Sunday, January 11, 2009, 1.33 ft above the tide tables, with 27 roads at risk, including Chelsea Street, William T. Morrissey Boulevard and Marginal Street.

Jan 11, 2009: 27 roads at risk13.03 ft at the Boston gauge · 1.3 ft above the tide tables · deepest: Likely · model estimate

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.

Highest water in 2009

Highest water days in Boston in 2009
Date	High water · Boston	vs tide tables	Roads at risk	Deepest streets (model)
Jan 11, 2009	13.03 ft	+1.33 ft	27Likely	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Jun 22, 2009	12.88 ft	+1.09 ft	22Likely	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Jun 24, 2009	12.88 ft	+0.96 ft	22Likely	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Oct 18, 2009	12.80 ft	+1.61 ft	16Likely	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Jul 24, 2009	12.75 ft	+0.94 ft	14Likely	Chelsea Street, William T. Morrissey Boulevard, Marginal Street

Every day with roads at risk (36)

Every day with roads at risk in Boston in 2009
Date	High water · Boston	vs tide tables	Roads at risk	Deepest streets (model)
Jan 10, 2009	11.86 ft	+0.38 ft	2Possible	Chelsea Street
Jan 11, 2009	13.03 ft	+1.33 ft	27Likely	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Jan 12, 2009	12.27 ft	+0.56 ft	6Likely	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Jan 13, 2009	11.87 ft	+0.36 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Feb 12, 2009	11.85 ft	+1.08 ft	2Possible	Chelsea Street
Mar 30, 2009	12.07 ft	+1.25 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
May 26, 2009	11.97 ft	+0.22 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
May 28, 2009	11.85 ft	+0.37 ft	2Possible	Chelsea Street
Jun 20, 2009	11.87 ft	+0.81 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Jun 21, 2009	12.60 ft	+1.11 ft	12Likely	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Jun 22, 2009	12.88 ft	+1.09 ft	22Likely	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Jun 24, 2009	12.88 ft	+0.96 ft	22Likely	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Jun 25, 2009	12.56 ft	+0.69 ft	10Likely	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Jun 26, 2009	12.39 ft	+0.77 ft	8Likely	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Jun 27, 2009	11.88 ft	+0.69 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Jul 21, 2009	12.12 ft	+0.37 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Jul 23, 2009	12.16 ft	+0.28 ft	5Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Jul 24, 2009	12.75 ft	+0.94 ft	14Likely	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Jul 25, 2009	12.11 ft	+0.58 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Aug 19, 2009	11.97 ft	+0.44 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Aug 21, 2009	12.18 ft	+0.55 ft	5Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Aug 22, 2009	11.96 ft	+0.45 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Aug 23, 2009	11.85 ft	+0.65 ft	2Possible	Chelsea Street
Oct 16, 2009	12.62 ft	+1.93 ft	12Likely	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Oct 17, 2009	12.11 ft	+1.07 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Oct 18, 2009	12.80 ft	+1.61 ft	16Likely	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Oct 19, 2009	11.86 ft	+0.71 ft	2Possible	Chelsea Street
Nov 5, 2009	11.89 ft	+0.70 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Nov 6, 2009	11.88 ft	+0.80 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Nov 14, 2009	11.83 ft	+1.17 ft	2Possible	Chelsea Street
Dec 3, 2009	12.48 ft	+1.02 ft	10Likely	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Dec 4, 2009	11.87 ft	+0.37 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Dec 5, 2009	12.03 ft	+0.65 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Dec 6, 2009	12.00 ft	+0.94 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Dec 9, 2009	12.15 ft	+2.49 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Dec 31, 2009	11.87 ft	+0.55 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street