48 



MARINE FISHERIES OF NORTH CAROLINA 



NORTH LANDNG RIVER NEAR MOUTH 

 WEST NECK CREEK, VA. 



APPnOX, 3 MILES SOUTH OF NORTH LANDING 



NORTH LANDING, VA 



6 MILES SOUTH OF GREAT BBIDOE 



GREAT BRIDGE LOCK, VA 



Fig. 



23. Salinity observations before and after the installation of Great Bridge tidal guard lock. 

 Adapted from unpublished graph supplied by the Corps of Engineers, U. S. Army. 



prevailed; while, except in the neighborhood of the inlets, the exact opposite 

 is the case with the currents. For instance, in the upper part of Pamlico 

 Sound, the specimens taken during a strong northwesterly wind, and with a 

 strong southerly current, may show a high specific gravity. But by consulting 

 the weather record of the previous days or weeks it will be found that strong 

 easterly and southeasterly gales have prevailed. The water of the ocean was 

 thus driven into the Sound and then up it; the natural flow from the Albe- 

 marle was stopped, and the heavier, denser waters of the lower part of the 

 Sound banked up against it. As the wind changed to the southward and west- 

 ward, the pressure at the inlets was relieved and the water there began to 

 flow out; but the direction of the wind would prevent any great change of 

 conditions in the main body of the Sound, as its major axis extends nearly 



