Table 2. Tidal Differences— Bolinas Bay and Bolinas Lagoon 



Place 



Differences 



Ranges 



Time (hrs— min) 



Height (ft) 



Mean (ft) 



Diurnal (ft) 



High Water 



Low Water 



High Water 



Low Water 







Bolinas Bay 

 Bolinas Lagoon 

 San Francisco (( 



-0.29 



-0.20* 



iolden Gate 



-0.17 0.0 

 +0.31 0.74t 

 — Daily predictions 



0.0 

 0.73t 



4.0 

 3.0 



4.0 



5.7 

 4.4 



5.7 



*A plus (+) sign indicates that the tide at the subordinate station is later than at the reference station, 

 San Francisco, and the difference should be added, a minus ( — ") sign, that it is earlier and should be 

 subtracted. 



t Ratio of height at subordinate station to the height at San Francisco. 



Table 3. Tidal Data 



Tidal Plane 



San Francisco 



Bolinas Bay 



Bolinas Lagoon 





(feet) 



(feet) 



(feet) 



Highest Tide, 24 Dec. 1940 



8.0 







— 



Higher High Water 



5.7 



5.7 



4.4 



High Water Springs 



5.5 



5.5 



4.1 



Mean High Water 



5.1 



5.1 



3.8 



High Water Neaps 



4.7 



4.7 



3.5 



Mean Tide Level 



3.1 



3.1 



2.3 



Sea Level Datum (1929)* 



— 



2.8 



1.9 



Low Water Neaps 



1.5 



1.5 



1.1 



Mean Low Water 



1.1 



1.1 



0.8 



Low Water Springs 



0.7 



0.7 



0.5 



Mean Lower Low Water 



0.0 



0.0 



0.0 



Lower Low Water 



-0.2 



— 



— 



Lowest Tide, 26 Dec. 1932 and 17 Dec. 1933 



-2.70 



— 



— 



Tidal Range 



Diurnal 



5.7 



5.7 



4.4 



Mean 



4.0 



4.0 



3.0 



Spring 



4.8 



4.8 



3.6 



Neap 



3.2 



3.2 



2.4 



*The U.S. Geological Survey mean sea level is identical with the 1929 U.S. Coast and Geodetic 

 sea-level datum. 



Survey 



13 



