TIDES AND CURRENTS IN BOSTON HARBOR 



53 



Table 5. — Monthly extreme high water above sea-level datum, Boston Navy Yard- 

 Continued 



Highest tide of these observations was 10.1 feet above the sea-level datum and occurred on Apr. 16, 1861, 

 during a severe storm which destroyed the Minots Ledge Lighthouse. 

 The heights in the above table are referred to the sea-level datum defined on p. 41. 



