42 TON DOLOSSE 

 (2 LAYERS) 



54--90' AT JETTY 

 HEAD ONLY 



SLOPES VARIES 



SLOPE VARIES 

 MLLW 



ROCK ON SOUTH JETTY ONLY 

 (BOTH SIDES) 



STA 67 + 00 TO END OF NORTH JETTY HEAD 

 CROSS SECTION 



NOTE: 



CONC CAP IS 12' + WIDE 



SOUTH JETTY FROM 38 + 00 TO 48 + 00 





6'+ -»-| 

 ^J.5 TO 2.5 JJ'jt 





16' + MLLW , 

 S_ 1.5 TO 2.5>» 



/■ SLOPE VARIES 



SLOPES VARIES 



ROCK jfe 

 3' MAXg 





MLLW 



A dWl 



MLLW 



= — 











WOOD MATS AT 

 STA 30 + 00 NORTH 

 JETTY UNDER 7.5' 

 BEDDING 



WOOD MATS ' 









STA + 00 TO 67 + 00 (NORTH JETTY) 

 CROSS SECTION 



Figure 3. Typical cross section of north jetty 



armor stone on the south jetty. No extensive repairs, however, have been made to 

 the structure since 1988 (USAED, San Francisco 1996). 



The Humboldt Bay jetties are currently inspected annually by San Francisco 

 District Corps personnel. These inspections include both a thorough walk-over of 

 the structure as well as a subsurface investigation using side-scan sonar and dive 

 teams. This level of monitoring has helped to ensure that the structures receive 

 timely repairs, thereby avoiding a loss of functionality and catastrophic failure. 



Chapter 1 Introduction 



