FloodRoute

Boston king tides and high water in 2026

In 2026 (record through Sep 30, 2026), NOAA's Boston tide gauge recorded water high enough for FloodRoute's model to put at least one Boston road at risk on 39 days. The highest was 12.80 ft on Tuesday, June 16, 2026, 0.82 ft above the tide tables, with 16 roads at risk, including Chelsea Street, William T. Morrissey Boulevard and Marginal Street.

Jun 16, 2026: 16 roads at risk12.80 ft at the Boston gauge · 0.8 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 2026

Highest water days in Boston in 2026
DateHigh water · Bostonvs tide tablesRoads at riskDeepest streets (model)
12.80 ft+0.82 ft16LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.69 ft+0.80 ft14LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.68 ft+0.79 ft14LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.59 ft+0.91 ft12LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.56 ft+0.92 ft10LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street

Every day with roads at risk (39)

Every day with roads at risk in Boston in 2026
DateHigh water · Bostonvs tide tablesRoads at riskDeepest streets (model)
12.17 ft+1.15 ft5PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.24 ft+0.74 ft5PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.43 ft+0.94 ft8LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
11.94 ft+0.65 ft4PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
11.99 ft+1.06 ft4PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
11.78 ft+1.38 ft2PossibleChelsea Street
12.51 ft+1.51 ft10LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.52 ft+1.47 ft10LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
11.84 ft+0.94 ft2PossibleChelsea Street
12.42 ft+2.05 ft8LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.07 ft+1.03 ft4PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.03 ft+1.27 ft4PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
11.97 ft+0.59 ft4PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.56 ft+0.92 ft10LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
11.86 ft+0.21 ft4PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
11.79 ft+0.35 ft2PossibleChelsea Street
11.84 ft+0.02 ft2PossibleChelsea Street
12.17 ft+0.20 ft5PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.15 ft+0.25 ft4PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
11.91 ft+0.29 ft4PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.02 ft+0.85 ft4PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.35 ft+0.75 ft6LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.69 ft+0.80 ft14LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.80 ft+0.82 ft16LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.68 ft+0.79 ft14LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.42 ft+0.81 ft8LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.19 ft+1.01 ft5PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.01 ft+0.59 ft4PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.18 ft+0.52 ft5PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.54 ft+0.78 ft10LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.59 ft+0.91 ft12LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.08 ft+0.66 ft4PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
11.99 ft+0.93 ft4PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.35 ft+1.06 ft6LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.29 ft+0.90 ft6LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.16 ft+0.85 ft5PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.27 ft+1.66 ft6LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
12.45 ft+1.53 ft8LikelyChelsea Street, William T. Morrissey Boulevard, Marginal Street
11.96 ft+0.86 ft4PossibleChelsea Street, William T. Morrissey Boulevard, Marginal Street