Table 30 



Panama City Harbor Jetties 



Panama City Harbor, Florida, SAM 



Date(s) Construction and Rehabilitation History 



1910- The River and Harbor Act of 1910 authorizes a 22-ft-deep by 200-ft- 



1933 wide channel through East Pass connecting the Gulf of Mexico to 



St. Andrews Bay with maintenance dredging being done at the existing 

 natural channel. 



1933- Congress reauthorized the project providing for a 29-ft-deep by 



1934 450-ft-wlde entrance channel. A man-made channel was cut through 

 Lands End, and jetties were built (Figures 47 and 48) to provide 

 channel protection. As constructed, the east and west jetties were 

 800 and 850 ft long, respectively, and spaced approximately 1,500 ft 

 apart. The inner 300 ft of each jetty (hereafter called the jetty 

 wings) flared out at a 30-deg angle from the channel centerllne. 

 The seaward end of each jetty was constructed out to about the 



-12 ft mlw depth contour. The jetties were of rubble-mound con- 

 struction built to a crest width of 8 ft, a crest elevation of +6 ft 

 mlw, and 1V:1.5H side slopes (Figure 48, inset). Mostly 6- to 

 10-ton cover stone was placed over core stone which was in turn 

 placed on a 2-ft-thick stone foundation blanket. With the exception 

 of the landward 175 ft of each jetty, steel sheet pile (varying in 

 length from 15 to 40 ft) was placed along the jetty centerllne to 

 the crest elevation of +6 ft mlw. A total of 34,100 sq ft of sheet 

 pile was driven and 1,340, 1,360, 10,350, and 12,240 tons of apron, 

 foundation, core, and cover stone were placed, respectively. The 

 total cost of the jetties was $268,000. 



1935- During this time extensions were made to the landward ends of the 

 1942 jetties to prevent channel erosion, undermining, and possible flank- 

 ing of the jetties. The jetties also received minor repairs. Most 

 of the stone repairs and wing extensions used 4- to 8-ton capstone 

 and 25- to 2,000-lb corestone. 



1935 Deterioration of the jetties began almost Immediately, and extensive 

 repairs, primarily to the jetty wings, were undertaken. Jetty wings 

 were rebuilt and extended shoreward with steel sheet-pile bulkheads. 

 The sheet-pile bulkheads were driven to a crest elevation of +2.5 ft 

 mlw and were 800 and 1,050 ft long on the east and west wings, 

 respectively. A total of 40,800 sq ft of sheet pile was placed. 

 The total cost of the bulkheads and maintenance dredging was 

 $136,000. 



1936 Within 6 months of completion, the west jetty bulkhead was almost 

 entirely destroyed, and the east jetty bulkhead was badly damaged. 

 A total of 1,173 lln ft of sheet pile were redriven, and 4,730 tons 

 of rock riprap were placed along the base of the sheet pile. Also 



(Continued) (Sheet 1 of 6) 



85 



