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.

Jan 3, 1999: 5 roads at risk12.23 ft at the Boston gauge · 0.8 ft above the tide tables · deepest: Possible · 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 1999

Highest water days in Boston in 1999
Date	High water · Boston	vs tide tables	Roads at risk	Deepest streets (model)
Jan 3, 1999	12.23 ft	+0.75 ft	5Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Jun 15, 1999	12.18 ft	−0.02 ft	5Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Nov 24, 1999	12.13 ft	−0.10 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Apr 17, 1999	12.11 ft	+0.35 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street
Apr 18, 1999	12.02 ft	+0.07 ft	4Possible	Chelsea Street, William T. Morrissey Boulevard, Marginal Street

Every day with roads at risk (16)

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