Hornwort
Ceratophyllum demersum
Size: to 10 ft
Habitat: beneath the surface in quiet waters
Notes: May form dense thickets
from AWOIS: 1607
NM47/66 -- DANGEROUS WRECK OF DREDGE DRYLAND, 62 FT. LONG. 22 FT. WIDE REPORTED SUNK IN ABOUT 90 FT. COVERED ABOUT 55 FT.
CL1540/78 -- MAR, OPR-C622-RU/HE-78; ITEM 4; INVESTIGATION BEGAN 30 AUGUST AND WAS COMPLETED ON 18 SEPTEMBER. EFFECTIVELY CLEARED TO MIN. OF 45.5 FT., (38.5 FT. ON A 40 FT. SHOAL), WITH NO HANGS ENCOUNTERED.
FE221/78-79 -- OPR-C622-RU/HE; ITEM 4; REQUIRED CLEARANCE TO 45 FT. DUE TO POSSIBLE HAZARDS ON THE BOTTOM. 1 MILE, RADIUS CIRCLE DRAGGED TO 45 FT. EXCEPT TO 38 FT. ON 40 FT. SHOAL (SEE AWOIS NO.00752) NW OF AMBROSE LIGHT TOWER. NO HANGS ENCOUNTERED. RECOMMENDED THAT CLEARED AREA BE CHARTED WITH GREEN TINT WITH 45 FT. CLEARANCE NOTE WHERE APPROPRIATE.
H10224/86-87 -- OPR-C121-WH-86-87; WRECK FOUND DURING MAIN SCHEME HYDROGRAPHY AND SIDE-SCAN SONAR OPERATION 850M EAST OF REPORTED POSITION; SIX DIVES PERFORMED; 2-15 FT VISIBILITY; PNEUMATIC DEPTH GAUGE LEAST DEPTH OF 86 FT TAKEN ON TOP OF A 20 FT LONG DREDGE PIPE FLOAT FOUND 841.6M EAST OF AWOIS POSITION; WRECK SITE REVEALED PIPES, FLOATS, AND DREDGING EQUIPMENT. (UPDATED MSD 4/91)
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