JaxHarborTargetsandDiveResults.pdf

Jacksonville Harbor Survey

M82: Located along the Blount Island channel, just north of the western end of Fulton Cutoff, M82 generated a complex dipole signature with a total gamma deviation of 108 over 260 feet.

Located in seven feet of water, the anomaly crosses numerous lines and goes outside of Panamerican’s survey area (see Figure 55).

M84: Located along the Blount Island channel, M84 generated a complex dipole signature with a total gamma deviation of 820 over 290 feet. Located in seven feet of water, the anomaly crosses numerous lines and goes outside of Panamerican’s survey area (see Figure 55).

M95: Located in the Bartram Island survey area, M95 marks the central location of an extremely large cluster of anomalies covering several thousand square feet and generating a complex dipole signature with a total gamma deviation of 1,200. It is an unusual anomaly and is associated with a cluster of small piles whose sidescan images correlate with SS292 and SS304. Located in two feet of water (Mean Low Water), the anomaly is not thought to represent a historic watercraft. It is possible, based on the signature and acoustic images, that M95 represents debris piles or perhaps shell mounds. Because of the latter possibility, the anomaly should be tested (see Figure 61).

M109: Located in the Blount Island Terminal Turnaround, M109 generated a complex dipole signature with a total gamma deviation of 166 over 240 feet. Although located just south of Fulton Cutoff, the body of water this anomaly is located in was open to small craft in historic times. The strength of the anomaly may be in part due to the depth of water, four feet, mean low water (see Figure 54).

M110: Located just west of M111 in the Blount Island Terminal Turnaround, M110 generated a complex dipole signature with a total gamma deviation of 2,005 over 330 feet. Although located just south of Fulton Cutoff, the body of water this anomaly is located in was open to small craft in historic times. The strength of the anomaly may be in part due to the depth of water, four feet (see Figure 54).

M111: Located just east of M110 in the Blount Island Terminal Turnaround, M111 generated a complex dipole signature with a total gamma deviation of 432 over 150 feet. Although located just south of Fulton Cutoff, the body of water this anomaly is located in was open to small craft in historic times. The strength of the anomaly may be in part due to the depth of water, four feet (see Figure 54).

Table 7. Magnetic Anomalies.

Anomaly Area Map Easting Northing Strength Duration Type Association Description

Potential

Significance

M1 21 457585 2174490 40/-60 167 D Single source

NO

M2 20 459303 2177799 100 180 M SS270 Wire rope NO

M3 20 458949 2180331 95/-58 0 D Single source

NO

M4 20 459151 2181452 33/-88 115 D Single source

NO

M5 20 459269 2181766 720/-820 188 D SS254 Pipe NO

M6 TLY* 18 461664 2190667 82/-38 160 D

Single source

NO

M7 TLY 18 461841 2191088 69/-70 147 D

Single source

NO

Results

Anomaly Area Map Easting Northing Strength Duration Type Association Description Potential

Significance

M8 21 459268 2175742 15/-25 120 D Single source

NO

M9 17 461420 2193279 45/-60 277 D Unknown YES

M10 16 458284 2196650 150/-130 221 CD Wire Rope NO

M11 15 460464 2204509 30/-27 190 CD

Single source

NO

M12 DC 15 461777 2205459 30/-30 131 D

Single source

NO

M13 DC 14 464507 2207347 39/-41 254 CD

Single source

NO

M14 DC 13 467006 2208741 25/-30 153 D

Single source

NO

M15 BP 13 470257 2210078 290/-190 309 D SS199 Pipe NO

M16 BP 13 470099 2208922 30/-60 77 D

Single source

NO

M17 BP 13 470706 2208872 30/-91 131 D

Single source

NO

M18 BP 13 471332 2208630 240/-190 343 D Unknown YES

M19 BP 13 472045 2208093 180 292 M SS144 Pipe NO

M20 8 477502 2201511 -30 145 M Single source

NO

M21 8 477790 2201096 30/-20 124 D Single source

NO

M22 8 479430 2199660 150/-80 226 D SS141 Buoy NO

M23 FCO 8 482317 2200045 -150 170 M SS161

Single source

NO

M24 FCO 8 482732 2200118 -90 108 M

Single source

NO

M25 FCO 8 482974 2200167 15/-20 145 D SS162

Single source

NO

M26 FCO 8 483780 2200347 30/-20 67 D

Single source

NO

M27 FCO 7 487665 2201061 150/-80 293 CD SS164 Buoy NO

M28 FCO 7 488958 2201919 0 0 Utility line NO

M29 FCO 7 489062 2201413 0 0 Utility line NO

M30 FCO 7 490609 2201629 310/-220 400 CD SS166 Pipe NO

M31 FCO 7 491646 2201816 150 296 M

Single source

NO

M32 FCO 7 490996 2201693 115/-80 248 D SS167 Pipe NO

M33 FCO 7 492483 2201963 160 112 M

Single source

NO

M34 FCO 6 493258 2202081 25/-45 220 D SS115 Pipes NO

M35 FCO 6 493852 2202160 170/-210 235 D M36, SS116 Pipe NO

M36 FCO 6 493929 2202269 60/-35 133 D M35, SS116 Pipe NO

M37 FCO 6 494309 2202215 50/-15 203 D

Single source

Anomaly Area Map Easting Northing Strength Duration Type Association Description Potential

Significance

M38 FCO 6 494328 2203033 180/-50 177 D SS196 Pipe (line?) NO

M39 6 495257 2202239 295/-50 145 D SS114

Buoy GR

“37”

NO

M40 6 496686 2202023 120/-40 459 D SS120 Pipe NO

M41 6 497563 2202618 15/-25 93 D Single source

NO

M42 SJB 6 499271 2201213 25/-12 144 D M43 Unknown YES

M43 SJB 6 499462 2201284 63//-13 130 D M42 Unknown YES

M44 SJB 6 499879 2201300 460/-320 423 CD SS122 Pipe NO

M45 SJB 6 500602 2201782 15/-30 173 CD M45 Unknown YES

M46 SJB 6 500783 2201764 32/-10 77 D M46 Unknown YES

M47 MP 5 502524 2202553 -430 304 M

SS123,

SS127 Pipeline NO

M48 MP 5 505776 2203241 -270 217 M SS125 Pipe NO

M49 MP 5 506746 2202252 60/-130 294 CD Unknown YES

M50 MP 5 507145 2202246 90/-45 214 D SS89 Wire rope NO

M51 MP 5 507512 2202040 -65 144 M SS88 Pipe NO

M52 MP 4 508048 2201097 75/-130 233 D M53 Unknown YES

M53 MP 4 508248 2201068 80/-52 300 D M52 Unknown YES

M54 MP 4 508724 2201228 24/-51 142 D SS77 Pipe NO

M55 MP 4 509245 2200619 53/-224 230 D SS86 Chain/ cable NO

M56 MP 4 508233 2200436 560/-384 553 CD

SS27,

SS101,

SS103

Pipe NO

M57 MP 4 508913 2200561 25/-12 241 CD

Single source

NO

M58 MP 4 509282 2200106 70/-74 160 D Unknown NO

M59 MP 4 509444 2199931 55/-90 123 D

Single source

NO

M60 MP 4 510782 2199025 50/-64 140 CD Unknown YES

M61 MP 4 510627 2198494 1324/-92 140 CD SS29 Nav marker NO

M62 MP 4 510965 2198805 960/-44 126 D

Single source

NO

M63 MP 4 511663 2197779 27/-32 110 D

Single source

NO

M64 MP 4 512847 2197351 145/-15 120 D

Single source

NO

M65 MP 4 513429 2197272 140/-124 225 CD Unknown YES

M66 MP 4 513213 2197083 78/-85 105 D

Unknown In

IWW

Channel

NO

M67 MP 4 512823 2197095 44/-32 173 CD

Single source

NO

M68 4 511535 2199950 17/-32 200 D Single source

M69 3 515571 2199441 92/-91 190 D SS14 Pipe NO

Anomaly Area Map Easting Northing Strength Duration Type Association Description Potential

Significance

M70 3 517663 2200987 295/-330 350 D SS13 Dredge pipe NO

M71 1 522330 2206931 25/-10 127 D Single source

NO

M72 1 522903 2207126 90/-60 187 D Unknown YES

M73 1 523962 2206235 41 190 M SS66 Wire rope NO

M74 1 527488 2206773 191/-240 252 D Unknown YES

M75 1 529217 2206567 173/-90 181 D SS133 Nav light NO

75A BI 6 495847 2204558 87/-59 268 CD Unknown YES

M76 BI 6 495791 2204816 33/-30 121 D

Single source

NO

M77 BI 6 495309 2204866 25/-25 83 D

Single source

NO

M78 11 494895 2205959 212/-220 142 D Unknown YES

M78A 11 494804 2206393 31/-24 140 D Single source

NO

M79 BI 11 494042 2207681 10/-30 70 D

Single source

NO

M79A BI 9 483604 2208425 39/-57 73 D

Single source

NO

M80 BI 9 483296 2207484 -92 100 M

Single source

NO

M81 BI 8 482053 2203434 34/-43 134 D

Single source

NO

M82 BI 8 482602 2203478 70/-38 260 CD Unknown YES

M83 BI 8 482496 2203282 152/-260 267 CD SS180 Pipe NO

M84 BI 8 482339 2202629 610/-210 290 CD Unknown YES

M85 BI 8 482125 2201944 71/-79 210 D

Single source

NO

M86 14 466968 2206906 125/-112 143 CD

Single source

NO

M87 BAR 14 466080 2206812 104/-260 70 CD SS290 Pipe NO

M88 BAR 14 466021 2206389 145/-111 138 CD

Single source

NO

M89 BAR 14 466140 2206232 175/-320 194 CD

Single source

NO

M90 BAR 14 466304 2206206 61/-58 181 CD

Single source

NO

M91 BAR 14 466189 2205914 53/-250 117 CD

Single source

NO

M92 BAR 14 465302 2205879 230/-350 166 CD

Single source

NO

M93 BAR 14 466340 2204962 93/-67 110 CD

Single source

NO

M94 BAR 14 466534 2204417 52/-70 100 CD

Single source

NO

M95 BAR 14 466456 2203484 400/-500 1250 CD

SS292,

SS304 Unknown YES

M96 BAR 14 467981 2204750 600/-600 91 CD SS284 Pipeline NO

Anomaly Area Map Easting Northing Strength Duration Type Association Description

Potential

Significance

M97 BAR 14 464377 2205191 83-140 3000 CD

Single source

NO

M98 BAR 14 464555 2204737 44/-122 130 CD

Single source

NO

M99 BAR 14 464313 2205005 74/-109 203 CD

Single source

NO

M100 BAR 14 463801 2204890 93 60 CD

Single source

NO

M101 BAR 14 463502 2204805 56 115 M

Single source

NO

M102 BAR 14 463695 2204015 123/-154 175 CD SS302 Rock pile NO

M103 BAR 14 463416 2204573 21/-33 170 CD

Single source

NO

M104 BAR 14 463235 2204608 43/-34 90 CD

Single source

NO

M105 BAR 14 462792 2204323 38/-25 116 CD

Single source

NO

M106 BAR 15 462214 2204171 73/-41 108 CD

Single source

NO

M107 BRT 15 461603 2203956 49/-40 111 D

Single source

NO

M106A BITT 14 486059 2200680 15/-25 123 CD SS176 Pipe NO

M107A BITT 7 486391 2200598 63/-102 150 CD

Single source

NO

M108 BITT 7 486817 2200525 53/-118 158 D

Single source

NO

M109 BITT 7 485968 2200509 94/-72 240 CD Unknown YES

M110 BITT 7 486385 2200027 980/-1025 330 CD Unknown YES

M111 BITT 7 486263 2199952 102/-330 150 D Unknown YES

M112 BITT 7 486615 2200078 440/-68 157 CD

Single source

NO

M113 BITT 7 486833 2200222 55/-51 105 CD SS178 Pipe NO

M114 BITT 7 486746 2200159 37/-29 66 D

Single source

NO

M115 BITT 7 486693 2200251 20/-20 72 D

Single source

NO

M116 BITT 7 486765 2200407 60/-22 77 CD

Single source

NO

M117 BITT 7 485836 2200596 28/-18 128 D

Single source

NO

**M = Magnetic Anomaly, SS = Sidescan Sonar Target, TLY = Talleyrand Terminal Turning Basin, DC = Drummond Creek, BP = Broward Point, FCO = Fulton Cutoff, SJB = St. Johns Bluff, MP = Mile Point, BI = Blount Island, BAR = Bartram, BITT = Blount Island Terminal Turnaround

Table 8. Sidescan Sonar Targets.

Anomaly Area Map Easting Northing Description Association

NRHP

Significance

SS-1 3 513402 2199204 small modern boat NO

SS-2 3 517118 2200362 post/piling stubs in line? NO

SS-3 2 517636 2201093 possible dredge pipe M70 NO

SS-4 2 518473 2203004 debris field, pipes NO

SS-5 2 518775 2203723 modern infrastructure, Ferry Dock SS8 NO

SS-6 2 518808 2203889 modern infrastructure, Ferry Dock SS9, SS99 NO

SS-7 2 518963 2204130 pipe? Log? SS92, SS100 NO

SS-8 2 518801 2203708 modern infrastructure, Ferry Dock SS5, SS6 NO

SS-9 2 518840 2203607 pipe? more than one NO

SS-10 2 518526 2203015 Anchor, old folding stock? SS4 YES

SS-11 3 517888 2201233 buoy SS18, SS12 NO

SS-12 3 517871 2201170 buoy & buoy anchor SS11, SS18 NO

SS-13 3 517641 2201041 dredge pipe and other debris M70 NO

SS-14 3 515563 2199473 pipe M69 NO

SS-15 3 514757 2199005 buoy red "24" NO

SS-16 3 512467 2199439 buoy NO

SS-17 3 516847 2200016 buoy NO

SS-18 3 517894 2201252 buoy SS11, SS12 NO

SS-19 3 518126 2201841 Object, pipe, anchor? NO

SS-20 2 518835 2203437 object, unknown (not wreck-like) NO

SS-21 2 518916 2203602 debris field - pipes? NO

SS-22 2 518953 2203691 wire rope? NO

SS-23 2 518886 2203778 v-shaped object, metal frame? NO

SS-24 2 518908 2203886 debris field - pipe and tires NO

SS-25 2 519973 2205664 object pipe or log NO

SS-26 MP 5 507170 2201720 wire rope NO

SS-27 MP 4 508242 2200548 structure/Pipe? - 140 ft. long

SS101,

SS103, M56

NO

SS-28 MP 4 509218 2199876 object pipe or log NO

SS-29 MP 4 510693 2198543 Nav posts M61 NO

SS-30 2 519286 2201740 beam or post SS43 NO

SS-31 2 519380 2201830 debris, pipe, tires (floating boat) NO

SS-32 2 519352 2202127 pipes or logs NO

Anomaly Area Map Easting Northing Description Association

NRHP

Significance

SS-33 2 519494 2202206 modern infrastructure NO

SS-34 2 519760 2202902 Debris, pipes and tires SS52 NO

SS-35 2 519857 2203091 object, debris NO

SS-36 2 519960 2203338 pipes NO

SS-37 2 520069 2203630 pipes SS42 NO

SS-38 2 520117 2203763 small object SS54 NO

SS-39 2 520658 220440 Object- unknown SS40 YES

SS-40 2 520615 2204376 wire rope? SS39 NO

SS-41 2 520440 2204163 object cable/pipe SS55 NO

SS-42 2 520153 2203772

debris field wire rope and other objects

SS37 NO

SS-43 2 519245 2201774 small boat, possible buoy weight? SS30 NO

SS-44 3 518810 2201088 wire rope(s)and debris

At, near historic Coaling Docks

NO

SS-45 3 517820 2199945 wire rope or pipe NO

SS-46 3 518326 2200431 pipe, log NO

SS-47 3 518508 2200658 wire rope, buoy cable? NO

SS-48 2 519763 2202779 rock scatter? structure? Near SS52 YES

SS-49 2 519941 2203344 pipes NO

SS-50 2 519342 2201998 objects pipe/log? NO

SS-51 2 519650 2202621 objects pipe/log? NO

SS-52 2 519797 2202857 Debris with possible structure SS34 YES

SS-53 2 519911 2203224 pipe NO

SS-54 2 520034 2203607 debris SS38 NO

SS-55 1 520430 2204111 object structure, unknown SS41 NO

SS-56 2 524321 2206268 buoy NO

SS-57 1 526702 2205980 pipe/log? NO

SS-58 1 526097 2205990 wire rope? SS59 NO

SS-59 1 526042 2205993 pipe SS58 NO

SS-60 1 525795 2206051 debris, tire SS61 NO

SS-61 1 525853 2206051 object(s) small SS60 NO

SS-62 1 525475 2206070 wire rope NO

SS-63 1 524933 2206136 wire rope NO

SS-64 1 524337 2206328 buoy SS67 NO

SS-65 1 522328 2205923 object small pipe or log NO

Anomaly Area Map Easting Northing Description Association

NRHP

Significance

SS-66 1 524078 2206137 Area of wire rope M73 NO

SS-67 1 524318 2206285 object metal beam or buoy anchor NO

SS-68 1 524435 2206140 debris - posts? NO

SS-69 1 524666 2206123 debris, pipe SS70 NO

SS-70 1 524736 2206128 pipe SS69 NO

SS-71 MP 5 508145 2201898 possible buoy weight NO

SS-72 MP 3 514003 2198151 wire rope NO

SS-73 MP 3 513742 2198285 box NO

SS-74 MP 5 507994 2201976 wire rope long - 150 ft. NO

SS-75 MP 5 507991 2201833 wire rope and object, anchor? NO

SS-76 MP 5 508409 2201631 wire rope long NO

SS-77 MP 4 508711 2201239 pipe M54 NO

SS-78 MP 4 510392 2200001 pipe NO

SS-79 MP 3 514542 2198088 wire rope NO

SS-80 MP 3 516528 2198936 wire rope NO

SS-81 MP 3 515783 2198594 objects, unknown NO

SS-82 MP 3 514066 2198055 pipe NO

SS-83 MP 4 509041 2200910 objects, pipes? NO

SS-84 MP 5 508415 2201556 wire rope NO

SS-85 MP 5 507746 2202131 wire rope NO

SS-86 MP 4 509271 2200643 chain or cable M55 NO

SS-87 MP 3 516583 2198846 wire rope NO

SS-88 MP 5 507507 2202033 object pipe? M51 NO

SS-89 MP 5 507149 2202169 wire rope and debris M50 NO

SS-90 MP 5 507362 2202065 wire rope NO

SS-91 2 518823 2203849 pilings by infrastructure SS6, 99 NO

SS-92 2 519010 2204101 dredge pipe/ pipeline SS7, SS100 NO

SS-93 2 519771 2205060 box and wire rope old buoy? SS96 NO

SS-94 2 519837 2205295 debris NO

SS-95 2 520758 2206286 object in seds pipe? tree? NO

SS-96 2 519739 2205114 debris tire SS93 NO

SS-97 2 519552 2204921 pipe NO

SS-98 2 518967 2204186 pipeline NO

SS-99 2 518844 2203860 debris field, pipe, wire rope SS6, 91 NO

SS-100 2 518994 2204098 pipe SS7, SS92 NO

Anomaly Area Map Easting Northing Description Association

NRHP

Significance

SS-101 MP 4 508091 2200509 Object, unknown structure YES

SS-102 MP 4 508662 2199939 object unknown, tree? NO

SS-103 MP 4 508302 2200317 pipeline, pipe NO

SS-104 MP 4 509097 2199657 wire rope, pipeline? NO

SS-105 MP 4 512455 2196886 object - tree, pipe? NO

SS-106 MP 4 513610 2196590 navigation posts NO

SS-107 MP 4 512613 2196684 Debris- outside of project area NO

SS-108 MP 4 512519 2196686 buoy outside of area NO

SS-109 MP 4 512478 2196725 tree hang? outside of project area NO

SS-110 4 510937 2200602 structure, crane boom? Outside Area NO

SS-111 SJB 6 499594 2202490 buoy, Red "4" SS112 NO

SS-112 SJB 6 499674 2202381 pipe or log SS111 NO

SS-113 6 501010 2202755 small object NO

SS-114 FCO 6 495056 2202332 buoy, Green "37" M39 NO

SS-115 FCO 6 493330 2202097 Pipes (3-4) M35 NO

SS-116 FCO 6 493849 2202151 pipe

SSII8, M35,

M36

NO

SS-117 SJB 6 496581 2202205 buoy, Green "35"

SS119,

SS120, M40

NO

SS-118 FCO 6 493936 2202186

Object - unknown (In Fulton Cutoff)

SS116, M35,

M36

NO

SS-119 SJB 6 496653 2202008 pipe

SS117,

SS120, M40

NO

SS-120 SJB 6 496557 2202017 debris, pipe, tires, NO

SS-121 SJB 6 497625 2201545 pipe NO

SS-122 SJB 6 499936 2201283 pipe M44 NO

SS-123 5 502527 2202534 pipe/pipeline SS127, M47 NO

SS-124 5 506416 2203148 small object box (buoy weight?) NO

SS-125 5 505778 2203204 pipe M48 NO

SS-126 5 503600 2203099 buoy NO

SS-127 5 502537 2202505 pipe/pipeline SS127, M45 NO

SS-128 SJB 6 496263 2202050 buoy weight? boat upside down? NO

SS-129 FCO 6 495441 2202173 Object linear, pipe? NO

SS-130 SJB 6 500098 2201491 Posts in line? YES

SS-131 5 509419 2201819 linear feature, wire rope, pipeline?? NO

SS-132 2 520398 2206271 pipe NO

SS-133 1 529453 2206496 buoy M75 NO

SS-134 8 478798 2200092 wire rope or pipe NO

Anomaly Area Map Easting Northing Description Association

NRHP

Significance

SS-135 8 477435 2201664 Unknown circular object NO

SS-136 12 475807 2204354 Pipe, pipeline NO

SS-137 12 475509 2204595 buoy, Green "51" NO

SS-138 12 473154 2207241 buoy, Green "53" NO

SS-139 12 471078 2208820 buoy, Green "55" NO

SS-140 8 479650 2199550 small box, buoy weight NO

SS-141 8 479400 2199632 wire rope or buried pipe M22 NO

SS-142 12 475618 2204381 pipe or tree possible NO

SS-143 12 473943 2206217 pipe NO

SS-144 12 472019 2208010 pipe post or object in seds M19 NO

SS-145 12 471065 2208871 unknown, next to Green "55" SS139, M17 NO

SS-146 8 477114 2202283 buoy, Green "49" NO

SS-147 12 473170 2207113 pipe NO

SS-148 12 474900 2206279 small unknown NO

SS-149 8 478849 2201457 buoy block? NO

SS-150 8 479611 2201044 Possible rock outcrop YES

SS-151 7 491610 2201950 debris, tire SS171, M31 NO

SS-152 7 486473 2200877 object unknown, A frame ? NO

SS-153 491357 2201827 debris, pipe NO

SS-154 7 485955 2200794 pipe NO

SS-155 490663 2201705 debris SS166, M30 NO

SS-156 8 481439 2199943 pipe NO

SS-157 8 481169 2199888 box , buoy weight? NO

SS-158 8 481035 2199868 debris, tires, pipe NO

SS-159 8 480885 2199830 pipe, rock looks facility-like NO

SS-160 8 480225 2199745 pipe NO

SS-161 8 482329 2200067 facility, modern infrastructure M23 NO

SS-162 8 482939 2200164 small object M25 NO

SS-163 7 487354 2201000 buoy NO

SS-164 7 487695 2201079 pipe, pipeline M27 NO

SS-165 7 490329 2201648 pipe, pipeline NO

SS-166 7 490589 2201625 pipe SS155, M30 NO

SS-167 7 490973 2201706 two pipes in bottom M32 NO

SS-168 7 491184 2201830 small debris field NO

SS-169 7 491291 2201753 crossed pipes NO

Anomaly Area Map Easting Northing Description Association

NRHP

Significance

SS-170 7 491372 2201858 pipe NO

SS-171 7 491725 2201931 small object SS151, M31 NO

SS-172 7 491343 2201808 pipes NO

SS-173 7 490034 2201475 pipe or other NO

SS-174 7 489450 2201423 pipe NO

SS-175 7 485709 2200604 pipe NO

SS-176 7 486012 2200640 pipe M106A NO

SS-177 7 486118 2200326 box, buoy weight NO

SS-178 7 486855 2200280 object tree, pipe? M113 NO

SS-179 8 482667 2203710 debris, tire NO

SS-180 8 482532 2203307 pipes M83 NO

SS-181 8 482139 2201760 debris, pipe NO

SS-182 8 482265 2202217 pipes in scours NO

SS-183 10 487484 2211964 small rock/debris scatter NO

SS-184 10 487071 2211875 pilings, floating shrimper NO

SS-185 10 486454 211806 Ballast like pile of rocks YES

SS-186 10 488361 2211868 pipe/log NO

SS-187 10 486354 2211584 box or buoy weight NO

SS-188 10 486819 2211724 small object NO

SS-189 11 494348 2207463 boat mooring (boat present) NO

SS-190 10 491802 2209201 buoy NO

SS-191 11 493300 2208297 mooring NO

SS-192 6 495726 2203749 rock concentration with object? NO

SS-193 6 495367 2204674 pipe NO

SS-194 8 481399 2201947 buoy, nav post ? NO

SS-195 6 494107 2203021 wire rope long (pipeline?) NO

SS-196 6 494317 2203079 pipe, pipeline M38 NO

SS-197 6 494714 2202982 small modern boat NO

SS-198 13 468356 2209995 cluster of pipe/logs NO

SS-199 13 470253 2210101 pipe/logs M15 NO

SS-200 13 468859 2210295 Debris pile, outside survey area NO

SS-201 13 469375 2210295 Debris in area of shipwreck symbol YES

SS-202 13 470682 2210105 pipes or logs, some rock NO

SS-203 13 471007 2210017 pipes or log NO

SS-204 13 471369 2209914 wire rope NO

Anomaly Area Map Easting Northing Description Association

NRHP

Significance

SS-205 13 471227 2210015 pipes or log NO

SS-206 13 470731 2210237 pipes or log NO

SS-207 13 470583 2210294 pipes or log NO

SS-208 13 470527 2210395 buoy NO

SS-209 15 462061 2206417 buoy, Red "60" NO

SS-210 15 459106 2204711 pipe NO

SS-211 15 460933 2205642 pipe NO

SS-212 15 461657 2206155 pipe or wire NO

SS-213 13 468685 2210129 debris with rocky pile NO

SS-214 13 467609 2209627 wire rope, pipeline NO

SS-215 13 467176 2209458 rock scatter NO

SS-216 13 465571 2208471 buoy NO

SS-217 13 466003 2208655 buoy NO

SS-218 13 466316 2208333 buoy, Green "59" NO

SS-219 13 466113 2208214 Unknown NO

SS-220 13 465884 2207954 Buoy anchor, box? NO

SS-221 15 460835 2205024 buoy, Green "71" SS245 NO

SS-222 15 462632 2206073 wire rope long NO

SS-223 13 466189 2208101 mooring lines NO

SS-224 15 461539 2205376

Odd scour pattern – channel edge slump?

NO

SS-225 13 465677 2207542 small upside down boat, modern NO

SS-226 DC 15 460783 2204922 Unknown linear, geologic? YES

SS-227 TR 16 458134 2201529 Pipe/log NO

SS-228 TR 16 458071 2201188 object, possible anchor NO

SS-229 TR 15 459110 2204702 small modern boat, buoy weight? NO

SS-230 16 458106 2200704 buoy, Red "66" SS251 NO

SS-231 17 458926 2194249 Object, unknown YES

SS-232 17 459292 2193942 debris field, pipes, posts NO

SS-233 17 459663 2193451 Sunken barge, wooden YES

SS-234 17 460308 2192607 Liner features, possible wreckage SS239 YES

SS-235 17 460534 2192435 pipe and box? SS236 NO

SS-236 17 460402 2192481 pipes /logs SS235 NO

SS-237 17 460500 2192297 debris field, piling field NO

SS-238 17 460488 2192451

Large linear object (wreckage?)

and pipe

YES

SS-239 17 460324 2192613 Possible wreckage (lower hull) SS234 YES

Anomaly Area Map Easting Northing Description Association

NRHP

Significance

SS-240 17 460146 2192705

Linear features, possible wreck by post

Outside Area YES

SS-241 17 459251 2193935 nav marker with posts NO

SS-242 17 459094 2194129 Object, unknown YES

SS-243 17 458690 2194544 pipe, tire NO

SS-244 17 458351 2194832 unknown, 2 large tires? NO

SS-245 15 460850 2205009 buoy, Green "71" SS221 NO

SS-246 17 458455 2195964 buoy NO

SS-247 17 460834 2193890 pipes NO

SS-248 16 457679 2199160 buoy NO

SS-249 16 457439 2196940

small object, possible weight for buoy above

NO

SS-250 16 457337 2196753 tire NO

SS-251 16 458111 2200695 buoy SS230 NO

SS-252 16 458265 2200794 pipe NO

SS-253 20 459122 2180385 pipe/log NO

SS-254 20 459285 2181761 pipe M5 NO

SS-255 19 459711 2183732 wire rope, pipeline? NO

SS-256 19 459989 2185645 pipe/log with rocks NO

SS-257 18 461009 2191034 dredge scars on bedrock NO

SS-258 20 458948 2179831 debris, pipe, tire NO

SS-259 20 459145 2180964 object, buoy weight? NO

SS-260 19 459415 2183091 buoy NO

SS-261 19 459675 2183983 object NO

SS-262 19 459682 2184501 debris, pipe, logs NO

SS-263 19 459750 2185066 structure collapsed dolphin NO

SS-264 19 459905 2185426 pipe/pilings NO

SS-265 18 460804 2190895 debris and rocks NO

SS-266 19 459845 2185176 structure collapsed dolphin NO

SS-267 20 459342 2178982 pipe/log NO

SS-268 20 459128 2177308 machine parts? not tires NO

SS-269 20 459226 2177471 small boat? NO

SS-270 20 459280 2177790 wire rope M2 NO

SS-271 20 459252 2178167 rock pile NO

SS-272 20 459290 2178283 Debris with rock NO

SS-273 20 459505 2179109 pipe/log NO

Anomaly Area Map Easting Northing Description Association

NRHP

Significance

SS-274 19 460443 2184590 Tall rock mound YES

SS-275 19 460297 2183296 rock mound around "Daymarker" NO

SS-276 20 459187 2177598 Buoy GR "72" M2 NO

SS-277 BAR 14 467698 2206895 rock pile NO

SS-278 BAR 14 467380 2207126 marker post NO

SS-279 BAR 14 468558 2204918 pipe(line) NO

SS-280 BAR 14 467765 2206079 pipe NO

SS-281 BAR 14 467752 2206232 wire cable? pipe? NO

SS-282 BAR 14 468316 2205146 Oyster bed? NO

SS-283 BAR 14 468086 2204798 pipe or cable very long NO

SS-284 BAR 14 467844 2204714 pipe or cable very long M96 NO

SS-285 BAR 14 467333 2207504 objects, pipe NO

SS-286 BAR 14 467618 2207407 pipe/log NO

SS-287 BAR 14 467721 2207584 pipeline NO

SS-288 BAR 14 465003 2206470 wire rope NO

SS-289 BAR 14 465656 2206872 pipe(line) NO

SS-290 BAR 14 465974 2206760 pipe M87 NO

SS-291 BAR 14 466832 2204410 wire rope M96 NO

SS-292 BAR 14 465878 2203033 pile, shell/rock?

SS230, SS304

M95

YES

SS-293 BAR 15 462581 2204477 wire rope NO

SS-294 BAR 15 461264 2203761 rocks NO

SS-295 BAR 15 461491 2203538 pipe NO

SS-296 BAR 14 463377 2204418 object rectangular large NO

SS-297 BAR 14 464533 2204828 pipe/log M98 NO

SS-298 BAR 14 463594 2204708 pipe(line) NO

SS-299 BAR 15 462485 2204117 pipe/log NO

SS-300 BAR 14 463580 2204344 pile of rock NO

SS-301 BAR 15 462612 2203927 pile of rock NO

SS-302 BAR 14 463718 2204018 pile of rock M102 NO

SS-303 BAR 14 464208 2206106 unknown NO

SS-304 BAR 14 466122 2202858 pile, shell/rock? SS292, M95 YES

TR = Trout River, FCO = Fulton Cutoff, SJB = St. Johns Bluff, MP = Mile Point, BAR = Bartram

Jacksonville Harbor Diving

Table 4-01. Potentially Significant Magnetic Anomalies.

Anomaly Area Easting Northing Strength Duration Type Description Significant

M9 461420 2193279 45/-60 277 D Metal Plate NO

M18 BP 471332 2208630 240/-190 343 D

Object buried in sediments

NO

M42 SJB 499271 2201213 25/-12 144 D

Single source object not encountered

NO

M43 SJB 499462 2201284 63/-13 130 D

Single source object no encountered

NO

M45 SJB 500602 2201782 15/-30 173 CD

Debris field with metal and concrete

NO

M46 SJB 500783 2201764 32/-10 77 D

Debris field with concreted metal

NO

M49 MP 506746 2202252 60/-130 294 CD

12 inch pipe with rocky debris pile

NO

M52 MP 508048 2201097 75/-130 233 D

24 inch pipe 90 feet

NO

M53 MP 508248 2201068 80/-52 300 D Concrete Slab NO

M60 MP 510782 2199025 50/-64 140 CD Wire rope NO

M65 MP 513429 2197272 140/-124 225 CD

Single source object not encountered

NO

M72 NC 522903 2207126 90/-60 187 D

Single source object not encountered

NO

M74 NC 527488 2206773 191/-240 252 D

Single source object not encountered

NO

M82 BI 482602 2203478 70/-38 260 CD

12 inch flanged pipe by 18 feet

NO

M84 BI 482339 2202629 610/-210 290 CD Wire rope NO

M95 BAR 466456 2203484 400/-500 1250 CD

Historic dump of large extent

NO

M109 BITT 485968 2200509 94/-72 240 CD

Single source object not encountered

NO

M110 BITT 486385 2200027 980/-1025 330 CD

Single source object not encountered

NO

M111 BITT 486263 2199952 102/-330 150 D

Steel pipe with coil of wire rope

NO

*M = Magnetic Anomaly, SS = Sidescan Sonar Target, TLY = Talleyrand Terminal Turning Basin, DC = Drummond Creek, BP = Broward Point, FCO = Fulton Cutoff, SJB = St. Johns Bluff, MP = Mile Point, BI = Blount Island, BAR = Bartram, BITT = Blount Island Terminal Turnaround, NC Navigation Channel

Investigative Findings

M9: Located just north of the Talleyrand Terminal Turning Basin, M9 generated a dipole signature with a total gamma deviation of 105 over 277 feet. The anomaly crossed three lines of survey and likely goes beyond the survey area (see Figure 64, James and Faught 2010).

Magnetic anomaly M9 was investigated on June 1 and 2, 2010. Located at a depth of 34 feet, nine probes were placed on the first dive, and 13 on the second. A hard metal plate that could be penetrated by the probing was encountered in one probe. The conclusion was that the target was a single source item, not considered historically significant, and not recommended for additional investigation.

M18: Located across the channel from Broward Point on the right bank descending, M18 generated a complex dipole signature with a total gamma deviation of 430 over 343 feet.

Magnetic anomaly M18 was investigated on May 12 and 14, 2010. At a depth of 32 feet, divers metal-detected and probed the buoyed location over multiple dives. Probing encountered an isolated object with hard return from probing determined to be approximately 10 feet in diameter, and 7 to 8 feet deep in the sediment column (i.e. 40 feet deep in water column). Object was not considered as wooden or to represent a shipwreck site; thus was considered not historically significant and not recommended for additional investigation

M42: Located on St. Johns Bluff Reach South, M42 generated a dipole signature with a total gamma deviation of 38 over 144 feet. The anomaly crossed three lines and appears towards the bluff outside of the survey area (see Figure 53, James and Faught 2010). Although small in nature, its location at St. Johns Bluff made it potentially significant as the anomaly may be associated with aspects of Fort Caroline, which is thought to have eroded into the water, or associated with the Civil War, as Confederates placed mines across the channel at this location.

Magnetic anomaly M42 was investigated on May 18, 2010. At a depth of 34 feet the diver probed for the target in cruciform pattern and encountered no resistance in any direction. Thus, the target appears to be a single source object not encountered, or possibly wire rope, but no significant cultural resource was encountered. No additional work is recommended for M2.

M43: Also located at St. Johns Bluff Reach South and near M42, M43 generated a dipole signature with a total gamma deviation of 76 over 130 feet. The small anomaly crossed three lines and appears towards the bluff outside of the survey area (see Figure 53, James and Faught 2010). Although small in nature, its location at St. Johns Bluff made M43 potentially significant, as it may be associated with aspects of Fort Caroline, which is thought to have eroded into the water in this area, or associated with the Civil War, as Confederates placed mines across the channel at this location.

Magnetic anomaly M43 was investigated on May 25, 2010. Located at a depth of 38 feet, divers inspected the area and probed nine points in cruciform pattern. A layer of resistance of apparent shell texture and hardness was detected between 5 and 7 feet. No indications of a historic cultural resource were encountered; the target is not considered to represent a historically significant cultural resource and is not recommended for further investigation.

M45: Also located at St. Johns Bluff Reach South and near M46, M45 generated a complex dipole signature with a total gamma deviation of 45 over 173 feet. The small anomaly crossed three lines and appears towards the bluff outside the survey area (see Figure 53, James and Faught 2010). Although small in nature, its location at St. Johns Bluff made M45 potentially significant as it may be associated with aspects of Fort Caroline which is thought to have eroded into the water in this area, or associated with the Civil War, as Confederates placed mines across the channel at this location.

Magnetic anomaly M45 was investigated on May 26, 2010. Located at a depth of 47 feet, a large metal debris field was located including pilings with lag bolts and much encrusted concrete rubble. The target appears to represent modern debris; thus is not considered historically significant and not recommended for additional evaluation.

M46: Also located at St. Johns Bluff Reach South and near M45, M46 generated a dipole signature with a total gamma deviation of 42 over 77 feet. Located in 12 feet of water, the small anomaly crossed three lines and appears towards the bluff outside the survey area (see Figure 53, James and Faught 2010). Although small in nature, its location at St. Johns Bluff made M45 potentially significant as it may be associated with aspects of Fort Caroline which is thought to have eroded into the water in this area, or associated with the Civil War, as Confederates placed mines across the channel at this location.

Magnetic anomaly M46 was investigated on May 21, 2010. The diver encountered flat concrete chunks of metal of various sizes by metal-detecting in a pattern around the buoy marker and then tactile survey. Some were buried to 5 inches, others occurred on the surface. Examples are shown in Figure 4-02. The target is not considered historically significant and is not recommended for further investigation.

Figure 4-02. Examples of the types of metal objects encountered at M46.

M49: Located at the north end of Mile Point, M49 generated a complex dipole signature with a total gamma deviation of 190 over 294 feet. The anomaly crossed numerous lines and most likely goes beyond the survey area (see Figure 52, James and Faught 2010).

Magnetic anomaly M49 was investigated on April 23, 2010. Located at a depth of 22 feet, the target was determined to be a 1-foot diameter pipe, 20 feet of which was exposed on the bottom.

One end of the pipe was covered in a pile of rock. The target is not historically significant and is not recommended for further investigation.

M52: Located at Mile Point, M52 generated a dipole signature with a total gamma deviation of 205 over 233 feet. The anomaly is adjacent to M53 (see Figures 51 and 52, James and Faught 2010).

Magnetic anomaly M52 was investigated on April 23, 2010. Located at a depth of 33 feet, the target was determined to be a 2-foot diameter pipe, 90 feet in length. The target is not historically significant and is not recommended for further investigation

M53: Located at Mile Point, M53 generated a dipole signature with a total gamma deviation of 132 over 300 feet. The anomaly is adjacent to M52 (see Figures 51 and 52, James and Faught 2010).

Buoyed at its central coordinates, investigation of this target location revealed a rectangular concrete slab flush with the bottom. Located in 35 feet of water at the time of the investigation, the slab measured 60 feet long by 22 feet wide. While iron rebar was not observed due mainly to a lack of visibility, the size of the structure dictates that it is iron reinforced, the cause for its magnetics. The target is not considered significant, and no additional work is recommended.

M60: Located at Mile Point in 6 feet of water, M60 generated a complex dipole signature with a total gamma deviation of 114 over 140 feet (see Figure 51, James and Faught 2010).

Anomaly M60 was investigated on April 28, 2010. Located in the middle of the ICWW at its confluence with the main river channel, three attempts were made to dive this target, with the third time successful. Boat traffic was deemed unsafe during the first attempt and diving was not conducted. Tidal currents never abated during a second attempt and diving again could not be conducted. A third attempt was made Thursday, April 29 where the diver encountered a 30 to 40 feet length (coils) of wire rope. The target is not significant and is not recommended for further investigation.

M65: Located at the eastern end of Mile Point, M65 generated a complex dipole signature with a total gamma deviation of 264 over 225 feet. The target is well outside of the ICWW (see Figures 50 and 51, James and Faught 2010).

Buoyed at its central coordinates, investigation of this target location with diver arcs employing a metal-detector was negative, indicating it was deeply buried. Hydro-probing to a depth of 10 feet was conducted in cruciform pattern covering an area 70-x-60-feet. However, the target source was not encountered. The target source is likely comprised of wire rope or debris of random shape that are easily missed by hydro-probing. The target is not considered significant and no additional investigations are recommended.

M72: Located to the west of entrance jetties on the north side of the channel, M72 generated a complex dipole signature with a total gamma deviation of 150 over 187 feet. The anomaly crossed numerous lines and most likely goes beyond the survey area (see Figure 48, James and Faught 2010).

Figure 4-03. Showing the location of the white target buoy as it was impacted by staged dredge piping.

The target was buoyed June 10, 2010, but found to be un-diveable by the presence of dredge equipment buoyed by large anchors on the target location (Figure 4-03). Because of results of M74, a similar target in the nearby area, and because study of historic maps and progression of historic channel dredging and deposition shows this area of the project to have been dramatically altered historically, the target was re-evaluated as a single source object target whose provenience is modern, as with M74. Therefore it is not considered historically significant and no additional investigations are recommended.

M74: Located just inside the entrance jetties on the north side of the channel, M74 generated a complex dipole signature with a total gamma deviation of 431 over 252 feet. The anomaly crossed numerous lines and most likely goes beyond the survey area (see Figure 48, James and Faught 2010).

Anomaly M74 was investigated on May 20, 2010. Located at a depth of 40 feet on a medium sandy bottom, the target location was metal detected and probed with no encounters. Subsequent dives on June 11, 2010 encountered wire rope. The target is not historically significant and no additional investigations are recommended.

M82: Located along the Blount Island channel, just north of the western end of Fulton Cutoff, M82 generated a complex dipole signature with a total gamma deviation of 108 over 260 feet.

The anomaly crossed numerous lines and goes out side of the survey area (see Figure 55, James and Faught 2010).

Anomaly M82 was investigated on April 28, 2010. Located in 18 feet of water, the anomaly was found to be a large concrete encased pipe 12 inches in diameter and 18 feet in length with an iron flange on each end. The target is not historically significant and is not recommended for further investigation.

M84: Located along the Blount Island channel, M84 generated a complex dipole signature with a total gamma deviation of 820 over 290 feet. The anomaly crossed numerous lines and goes outside of the survey area (see Figure 55, James and Faught 2010).

Anomaly M84 was investigated on April 26, 2010. Located in 21 feet of water, the anomaly was determined to be wire rope in excess of 20 feet in length. The target is not considered historically significant and is not recommended for further investigation.

M95: Located in the Bartram Island survey area, M95 marks the central location of an extremely large cluster of anomalies covering several thousand square feet and generating a complex dipole signature with a total gamma deviation of 1,200 (Figure 4-04). It is an unusual anomaly and is associated with a cluster of small piles whose sidescan images correlate with SS292 and SS304.

These positive relief features are also observed in the subbottom record and interpreted as deposited on, not in the historic bottom. The anomaly was clearly not a historic watercraft by its great size. It was considered probable, based on the signature and acoustic images, that M95 represented debris piles or, possibly, prehistoric shell mound features (under the possibility that fire pits and other features in such shallow water might result in magnetic variation). That such patterns are possible to perceive with magnetometry is confirmed by Sanger and Thomas (2010) from remote sensing on St. Catherine’s Island.

On May 3, 2010 the area was remotely sensed with sidescan sonar to refine the imagery of the bottom in this area, but the fine-grained nature of the bottom return did not add any additional information about the bottom and its character. The images remained “dark”, i.e. without additional backscatter information on the bottom texture.

Figure 4-04. GIS overlay of a portion of the Bartram research area, sidescan sonar mosaic of refinement area, magnetic contours, and dive locations.

This portion of the Bartram Island study area includes SS292 and SS304 sidescan sonar targets that were piles also noted in the subbottom profiler analysis. The area was investigated in multiple locations from May 4 through May 6. Operations took place with water depths of 5 to 6 feet of water. Each area is discussed below in the order in which they were investigated.

M95 Sample Area 1. The diver made several sweeps with the metal-detector in the vicinity of the buoy, with no return and then exchanged the metal-detector for the 6-foot hydro-probe.

Probing in cardinal directions from the center of the Sample Area centroid (Figure 4-04), the diver encountered limited resistance 3 to 6 feet below the bottom.

No excavations were attempted with the hydraulic dredge, the diver was able to probe the loose sediments, find objects, and identify them. The first impression was a large area of small objects, buried and exposed, and this was confirmed by additional investigations at Sample Areas 2 & 3.

M95 Sample Area 2. While probing a large pattern from SA-1 the diver located a “wood” return at 1 to 2 feet down (a stiff, but pliant sensation, contrasting metal or shell bearing encounters).

The boat was moved and by hand fanning, he was able to identify it as a large timber. The timber was located about 75 feet from the initial sample area and was marked as Sample Area 2.

Probing was conducted in cardinal directions from the location of the timber. Like the previous sample area, the diver noted a good amount of small isolated returns 3 to 5 feet below the bottom with hydro-probing. Dredging around the timber exposed it to a depth of 3 feet and a length of 9 feet. It was thoroughly examined and was not associated with any other timbers and did not have any fasteners or iron fittings. It was similar in size to a railroad tie.

The 4-inch hydraulic dredge effluent was filtered through a -inch equivalent mesh bag.

Numerous small objects of a debris nature were encountered, including pieces of glass, lumps of coal, wood chips, and a 2-x-2-inch timber a few feet in length. No objects of a ferrous nature were found. The fine marine silt extended to well below the 6-foot limit of the probe. Items were interpreted to be dispersed throughout the sediments with some lensing. Occasional oyster and other shell were also noted.

An oily sheen was noted on most of the dredged spoil, although not enough to make a sheen while dredging. Furthermore, the wood seemed to be creosoted (smell and look). Some of the debris in SA-2 appears to be 3 to 5 feet deep and it is lying on marine silt rather than hard bottom like sand or clay. No hard bottom was encountered in the area to the length of probe.

Sample Area 3. A third campaign was mounted to confirm or alter the conclusions from the two previous investigations. The diver hydro-probed in cardinal directions from the buoy drop, and noted similar returns to those at SA-1 and SA-2, namely small isolated objects 3 to 5 feet deep.

The diver also discovered a clay layer about 3 feet down, under which was fine sand and shell.

The clay appeared, when probed, to be hard, as if it had been fired. The diver proceeded to excavate in the vicinity of the clay layer, removing the overburden and retrieving a section of the layer. Examination on deck determined it to be unmodified clay with no evidence of fire hardening. There were several wood chips associated with the clay.

While dredging, the diver noted numerous pieces of isolated debris, including several of a ferrous content. Objects included aluminum soda cans, a modern brown glass beer bottle, chicken (bird) bones, medium sized mammal (possibly deer) bone, a large piece of thin tin, and shell. Like the first two sample areas, the debris was confined to a small band between 3 and 5 feet below the bottom. There was a pervasive smell of petroleum creosote, but no sheen on the water as in the previous experiences.

M95, and the two sidescan targets discussed below, are considered to be aspects of a large historic to modern, dump area. No significant resources are expected from this target area, and no additional investigations are recommended. Whether there are hazardous materials in this area is not known.

M109: Located in the Blount Island Terminal Turnaround, M109 generated a complex dipole signature with a total gamma deviation of 166 over 240 feet. Although located just south of Fulton Cutoff, the body of water this anomaly is located in was open to small craft in historic times (see Figure 54, James and Faught 2010).

Anomaly M109 was investigated on April 27, 2010. Located in 14 feet of water, the anomaly was probed in cardinal directions from the center of the anomaly. The bottom type was hard packed sand. All probes were negative, indicating the source of the anomaly is likely wire rope, that is small or is deeply buried. Regardless, the target is not considered historically significant and is not recommended for further investigation.

M110: Located just west of M111 in the Blount Island Terminal Turnaround, M110 generated a complex dipole signature with a total gamma deviation of 2,005 over 330 feet. Although located just south of Fulton Cutoff, the body of water this anomaly is located in was open to small craft in historic times (see Figure 54, James and Faught 2010).

Anomaly M110 was investigated on April 26, 2010. Located in 9 feet of water, the target was probed in a cruciform pattern. Probing failed to locate the target, indicating it is likely wire rope or is deeply buried. The target is not considered historically significant and is not recommended for further investigation

M111: Located just east of M110 in the Blount Island Terminal Turnaround, M111 generated a complex dipole signature with a total gamma deviation of 432 over 150 feet. Although located just south of Fulton Cutoff, the body of water this anomaly is located in was open to small craft in historic times (see Figure 54, James and Faught 2010).

Anomaly M111 was investigated on April 26, 2010. Located in 9 feet of water, the target was determined to be a length of steel pipe with a large coil of wire rope attached. The target is not considered historically significant and is not recommended for additional investigation.

SIDESCAN SONAR TARGET DIVING RESULTS

A total of 20 sidescan targets were considered potentially indicative of significant resources in need of avoidance or additional investigation (Figure 4-05, Table 4-02) from a pool of 304 sidescan sonar targets located during the 2009 remote sensing survey (James and Faught 2010).

Of the 20 sidescan targets thought to retain characteristics that could potentially represent a historically significant cultural resource, 11 were unidentified objects, six were rock scatters or mounds, two were debris fields, and one was a possible wreck. Specific descriptions of each, by category, are presented in the following paragraphs. Each of these was identified and evaluated and none are considered culturally historically significant, and none are recommended for additional investigation.

Figure 4-05. Distribution of sidescan sonar targets investigated.

Table 4-02. Disposition of Sidescan Sonar Targets investigated by the Jacksonville diving project of 2010.

Anomaly Area Easting Northing Result Association Significance

SS-10 MY 518526 2203015 Anchor SS4 NO

SS-39 MY 520658 220440 Modern sunken motor vessel SS40 NO

SS-48 MY 519763 2202779

Debris field of wire rope & concrete Near SS52 NO

SS-52 DP 519797 2202857 Modern shrimp boat SS34 NO

SS-101 MP 508091 2200509 Pipes of various size welded NO

SS-102 MP 508662 2199939 Tree trunks NO

SS-112 SJB 508662 2199939 Pipe NO

SS-129 FCO 499674 2202381

Field of riprap and brick fragments

NO

SS-130 SJB 500098 2201491 Rocks on bottom in line NO

SS-150 DP 479611 2201044 Natural bedrock bench NO

SS-226 DC 460783 2204922 Natural bedrock bench NO

SS-231 TAL 458926 2194249 Steel I-beam NO

SS-233 TAL 459663 2193451 Existing pier structure NO

SS-234 TAL 460308 2192607

Collapsed dolphin or pier structure

SS239 NO

SS-238 TAL 460488 2192451 Deteriorated pipe NO

SS-239 TAL 460324 2192613 Collapsed piling or dolphin SS234 NO

SS-242 TAL 459094 2194129 Piling or dolphin with NO

Anomaly Area Easting Northing Result Association Significance associated debris

SS-274 TAL 460443 2184590 Coquinoid rock mound NO

SS-292 BAR 465878 2203033

Limestone pile with live oyster growing

SS230, SS304

M95

NO

SS-304 BAR 466122 2202858

Limestone pile with live oyster growing

SS292, M95,

SB6

NO

TR = Trout River, FCO = Fulton Cutoff, SJB = St. Johns Bluff, MP = Mile Point, BAR = Bartram, TAL = Tallyrand, DP = Dames Point, MY = Mayport

OBJECTS

SS10: Located opposite Mayport, on the north side of the channel, SS10 is an object that has the appearance of a large stockless or folding stock anchor approximately 10 feet in length. While not a cultural resources site per se, it was thought to possibly represent a significant artifact type worthy of avoidance or retrieval (Figure 4-06).

Sidescan target SS10 was dived on May 13, 2010. Located in 38 feet of water, the target was a large Danforth type anchor with a 5-foot long stock. Partially embedded in the sandy bottom, the target was considered as a possible abandoned or lost mooring anchor. The Danforth anchor type, a variation of the U.S. Navy stockless, was developed by Richard Danforth and Bob Ogg specifically as a high efficiency anchor for use on seaplanes and military landing craft in World War II. The design was patented in 1940 and approved by Lloyd's of London as a High Holding Power anchor in 1964. The Danforth is a popular modern anchor type due to its high holding power and light weight, and is currently manufactured by Tie Down Engineering (Poiraud et al.

2008:23). This particular example is modern, not of historic importance, and the target is not recommended for additional investigation.

Figure 4-06. SS10, an anchor.

SS39: Located at Mayport, on the southern side of the channel, SS39 (Figure 4-07) was listed as an unknown object with the appearance of a possible watercraft, estimated at 20 feet in length from the sidescan image. Because it might possibly represent an historic vernacular craft, it was recommended that SS39 be avoided or investigated.

Sidescan target 39 was investigated on May 13, 2010. Located in 38 feet of water at the time of diving, the target position turned out to be a motor vessel sunk immediately adjacent to a recently constructed floating dock deck feature (aka Morning Star Marina). A modern vessel, the wreckage is of a 16-foot length vessel, possibly aluminum, 6-foot beam, and with an outboard motor still attached. Marine growth was noted encrusting the entire hulk. The target is not historically significant and is not recommended for further investigation.

Figure 4-07. SS39, bow to the bottom (south), outboard visible to the top (north).

SS48: Located opposite Mayport on the right bank descending, SS48 was listed as a rock scatter or mound (Figure 4-08). SS48 has many similarities to SS52, which is nearby and was categorized as a debris field. The rocklike scatter has several linear or structural components and was therefore worthy of investigation, as it may represent a historic watercraft wreckage or scuttled site.