TIDES AND CURRENTS IN BOSTON HARBOR 



89 



Table 41. — Condensed current data for selected localities 

 [Time differences refer to currents off Deer Island Light in President Roads Entrance] 



Boston Light Vessel 



Nahant (off East Point) 



Ljran Harbor Entrance 



North Channel (off Great 

 Faun) 



Hypocrite Channel 



Nantasket Roads Entrance . 



Black Rock Channel 



The Narrows (off Georges I.) 



The Narrows (off Gallups I.) 



Between Gallups I. and 

 Georges I 



Between Gallups I. and 

 Nixes Mate. 



Nubble Channel 



President Roads Entrance 

 (off Deer I. Light). 



Shirley Gut 



Off Winthrop (1 mile south). 



Governors I. Channel (en- 

 trance.) 



Main ship channel (off 

 Castle I.). 



Fort Point Channel En- 

 trance. 



Between Boston and E. 

 Boston. 



Off Navy Yard, Boston 



Chelsea River Entrance 



Mystic River Entrance 



Between Long I. and Spec- 

 tacle L 



Between Spectacle I. and 

 Castle I. 



Between Spectacle I. and 

 Thompson I. 



Between Thompson I. and 

 Castle I. 



Between Thompson I. and 

 Moon Head. 



Dorchester Bay (off Thim- 

 ble I.). 



Neponset River (N. Y., N. 

 H. & H. R. R. bridge). 



Between Moon Head and 

 Long I. 



Between Long I. and Rains- 

 ford I. 



Nantasket Roads (off 

 Georges I.). 



Nantasket Roads (off Rains- 

 ford L). 



Nantasket Gut 



Between Peddocks I. and 

 Nut I. 



Hingham Bay (off Bumkin 

 L). 



Weymouth Fore River En- 

 trance. 



Weymouth Fore River 

 (Quincy Pt. Bridge). 



Weymouth Back River 

 (drawbridge). 



Lati- 

 tude 



42 20 



42 25 



42 25 



42 21 



42 21 



42 19 



42 19 



42 19 



42 20 



42 19 



42 20 



42 20 



42 20 



42 21 



42 22 



42 21 



42 20 



42 21 



42 22 



42 22 



42 23 



42 23 



42 19 



42 20 



42 19 



42 19 



42 18 



42 18 



42 17 



42 19 



42 19 



42 19 



42 18 



42 18 



42 17 



42 16 



42 16 



42 15 



42 IS 



Longi- 

 tude 



70 45 



70 55 



70 57 



70 56 



70 54 



70 53 



70 55 



70 56 



70 56 



70 57 



70 57 



70 68 



70 59 



70 59 



71 01 



71 03 



71 03 



71 03 



71 02 



71 03 



70 58 



71 00 



71 00 



71 00 



71 00 



71 02 



71 02 



70 59 



70 58 



70 55 



70 57 



70 56 



70 57 



70 54 



70 56 



70 58 



70 56 



Time 

 differ- 

 ence 



H. TO. 



-0 25 



-0 25 



-0 10 



00 



-0 35 



-0 15 



-0 20 



-0 30 

 (') 



-0 45 



-0 45 



-1 00 

 -0 15 

 +0 05 



Strength of 



Inter- Direc- 

 val tion 



H. m. 



8 15 



8 20 



8 15 



8 30 



7 50 



8 15 

 8 20 

 7 55 



6 05 



7 35 



8 25 



8 55 



8 50 



8 20 



7 45 



8 45 



8 50 



8 50 



8 50 



9 00 

 9 10 

 9 10 

 8 35 



8 15 



5 40 



8 15 



7 45 



8 15 



7 50 

 5 40 



8 25 



8 45 



9 00 



7 55 



8 45 



8 10 



8 25 



8 05 



Flood 

 velocity 



Knots 

 0.1 

 .7 

 .4 



1.4 

 1.2 

 1.5 

 1.2 

 1.2 

 .4 



Ebb 

 velocity 



Knots 

 0.1 

 .6 

 .5 



1.6 

 1.0 

 1.5 

 1.2 

 1.2 

 1.0 



Current stations 

 Light vessel. 

 D30, W53. 

 W54. 



W50. 



W49. 



Wl. 



M17, D41. 



W13, M13, D44. 



D46. 



M14, W12. 

 M19. 



M20, W14. 

 W16. 



W27, M22. 



W28. 



W26. 



W30, D7, W33. 



W35. 



W37. 



W44, W46. 

 W47. 

 W48. 

 W18. 



Dll, W21, W22. 



W20. 



W23. 



W19. 



W24. 



W25. 



Wll. 



WIO. 



MIO, D51. 



D48, D49, W9. 



W2, D52. 

 W3. 



W5. 



W4. 



W7. 



1 Current irregular between Gallups Island and Lovell Island. See p. 

 For reference to Table 41, see p. 27. 



