{"type":"FeatureCollection","features":[{"type":"Feature","id":274,"geometry":{"type":"Polygon","coordinates":[[[-76.11448999999999,36.96868000000006],[-76.11688999999996,36.963040000000035],[-76.11201999999997,36.96204000000006],[-76.11012999999997,36.968090000000075],[-76.11448999999999,36.96868000000006]]]},"properties":{"ESRI_OID":274,"MSI_UID":274,"ATU":5,"TITLE":"Sector Virginia, Submerged Land Act (SLA) - Chesapeake Channel/General/Bridges/Construction","STATUS":"Approved","MSI_GROUP":"General","SUB_CATEGORY":"Bridges","TYPE":"Construction","WTRW_UID":100116382464,"MRN":"urn:mrn:iala:wwy:us:navIV:dis5:secvirexcecozon:secvirtersea:secvirsublanact:checha","WATERWAY_NAME":"Chesapeake Channel","CREATE_DATE":1725910101000,"MODIFIED_DATE":1741026194000,"BEGIN_DATE":1725840000000,"END_DATE":1777679999000,"DESCRIPTION":"General/Bridges/Construction\n\nFrom: 2024-09-09 To: 2025-03-08\n\nLocation:\n36.96868° N / 76.11449° W\n36.96809° N / 76.11013° W\n36.96204° N / 76.11202° W\n36.96304° N / 76.11689° W\n36.96868° N / 76.11449° W\n\nChesapeake Tunnel Joint Venture will continue Tug, Crane, and Barge operations near the existing tunnel protection berms for Islands 1 and 2. Work will not impede the navigational channel. A crane barge may be held in place by way of spuds, a six-point anchoring system or made fast to several steel mooring piles. Buoys will be attached to the anchors so that they may be moved as the crane barge advances.  Buoys will be illuminated at night by one second flashing white lights and the barges will be illuminated by steady white lights on all corners. The steel piles will be illuminated at night by white lights. The steel piles and trestle will be positioned west of Island #1 approximately 125 feet and extending north of the fishing pier approximately 1000 feet. The ROBERT T and ANGELINA AUTUMN will be on VHF-FM 13 and 16.","COORDINATES_JSON":"{\"type\":\"Polygon\",\"coordinates\":[[[-76.11449,36.96868],[-76.11689,36.96304],[-76.11202,36.96204],[-76.11013,36.96809],[-76.11449,36.96868]]]}","COORDINATES_TYPE":"Polygon","DECIMAL_LONGITUDE":null,"DECIMAL_LATITUDE":null}},{"type":"Feature","id":275,"geometry":{"type":"Polygon","coordinates":[[[-76.10701999999998,36.98527000000007],[-76.10941999999994,36.97963000000004],[-76.10454999999996,36.97863000000007],[-76.10265999999996,36.984680000000026],[-76.10701999999998,36.98527000000007]]]},"properties":{"ESRI_OID":275,"MSI_UID":275,"ATU":5,"TITLE":"Sector Virginia, Submerged Land Act (SLA) - Chesapeake Channel/General/Bridges/Construction","STATUS":"Approved","MSI_GROUP":"General","SUB_CATEGORY":"Bridges","TYPE":"Construction","WTRW_UID":100116382464,"MRN":"urn:mrn:iala:wwy:us:navIV:dis5:secvirexcecozon:secvirtersea:secvirsublanact:checha","WATERWAY_NAME":"Chesapeake Channel","CREATE_DATE":1725910136000,"MODIFIED_DATE":1741026174000,"BEGIN_DATE":1725840000000,"END_DATE":1777679999000,"DESCRIPTION":"General/Bridges/Construction\n\nFrom: 2024-09-09 To: 2025-03-08\n\nLocation:\n36.96868° N / 76.11449° W\n36.96809° N / 76.11013° W\n36.96204° N / 76.11202° W\n36.96304° N / 76.11689° W\n36.96868° N / 76.11449° W\n\nChesapeake Tunnel Joint Venture will continue Tug, Crane, and Barge operations near the existing tunnel protection berms for Islands 1 and 2. Work will not impede the navigational channel. A crane barge may be held in place by way of spuds, a six-point anchoring system or made fast to several steel mooring piles. Buoys will be attached to the anchors so that they may be moved as the crane barge advances.  Buoys will be illuminated at night by one second flashing white lights and the barges will be illuminated by steady white lights on all corners. The steel piles will be illuminated at night by white lights. The steel piles and trestle will be positioned west of Island #1 approximately 125 feet and extending north of the fishing pier approximately 1000 feet. The ROBERT T and ANGELINA AUTUMN will be on VHF-FM 13 and 16.","COORDINATES_JSON":"{\"type\":\"Polygon\",\"coordinates\":[[[-76.10702,36.98527],[-76.10942,36.97963],[-76.10455,36.97863],[-76.10266,36.98468],[-76.10702,36.98527]]]}","COORDINATES_TYPE":"Polygon","DECIMAL_LONGITUDE":null,"DECIMAL_LATITUDE":null}},{"type":"Feature","id":13519,"geometry":{"type":"Polygon","coordinates":[[[-76.02793999999994,35.91372000000007],[-76.03366999999997,35.904450000000054],[-75.98124999999999,35.89296000000007],[-75.96614999999997,35.90056000000004],[-76.02793999999994,35.91372000000007]]]},"properties":{"ESRI_OID":13519,"MSI_UID":13519,"ATU":5,"TITLE":"Alligator River/General/Bridges/Construction","STATUS":"Approved","MSI_GROUP":"General","SUB_CATEGORY":"Bridges","TYPE":"Construction","WTRW_UID":100116382857,"MRN":"urn:mrn:iala:wwy:us:navIV:dis5:secnorcarexcecozon:secnorcartersea:secnorcarsublanact:oreinl:pamsou:crosou:albsou:allriv","WATERWAY_NAME":"Alligator River","CREATE_DATE":1741959614000,"MODIFIED_DATE":1742224478000,"BEGIN_DATE":1741910400000,"END_DATE":1890777599000,"DESCRIPTION":"General/Bridges/Construction\n\nFrom: 2025-03-14 To: 2029-11-30\n\nLocation:\n35.91372° N / 76.02794° W\n35.90056° N / 75.96615° W\n35.89296° N / 75.98125° W\n35.90445° N / 76.03367° W\n35.91372° N / 76.02794° W\n\nBridge construction area. \nMariners are advised that an engineering firm, on behalf of North Carolina Department of Transportation, will be performing construction on the US 64 (Alligator River Bridge) Bridge over AICW (Alligator River), mile 83.5, between Dare and Tyrrell County, NC. Construction began on February 14, 2025, and will continue through November 30, 2029, Monday through Sunday, 24 hours per day.  Detailed project information and information concerning waterway closures will be provided via updated local notice to mariners, broadcast notice to mariners and/or marine safety information bulletins. \n\nTo facilitate bridge construction, two temporary crane work trestles will be constructed alongside the location of replacement bridge, one to the south on the west side approach and one to the north on the east side approach. One temporary material/load out trestle will be constructed off the western shoreline to the south of the location of the replacement bridge. All temporary trestles will remain in place for the duration of construction and will not affect the horizontal and vertical clearances of the existing bridge. \n\nMooring piles (19) will be constructed outside the navigational channel to secure material barges during daily operations and inclement weather and three mooring anchoring locations will be temporally used for barges and will be outside the navigational channel.\n\nWork vessels barges may be reached on VHF-FM channel 13 and 16. The project foreman may be reached at (850) 461-6116.  Mariners should use extreme caution when navigating through the area.\n","COORDINATES_JSON":"{\"type\":\"Polygon\",\"coordinates\":[[[-76.02794,35.91372],[-76.03367,35.90445],[-75.98125,35.89296],[-75.96615,35.90056],[-76.02794,35.91372]]]}","COORDINATES_TYPE":"Polygon","DECIMAL_LONGITUDE":null,"DECIMAL_LATITUDE":null}},{"type":"Feature","id":17413,"geometry":{"type":"Polygon","coordinates":[[[-70.82029999999997,42.89900000000006],[-70.82134999999994,42.89530000000008],[-70.81699999999995,42.89471000000003],[-70.81104999999997,42.89251000000007],[-70.80813999999998,42.89488000000006],[-70.81607999999994,42.89746000000008],[-70.82029999999997,42.89900000000006]]]},"properties":{"ESRI_OID":17413,"MSI_UID":17413,"ATU":1,"TITLE":"Sector Northern New England, Submerged Lands Act (SLA) - Hampton Harbor/General/Bridges/Construction","STATUS":"Approved","MSI_GROUP":"General","SUB_CATEGORY":"Bridges","TYPE":"Construction","WTRW_UID":100116382107,"MRN":"urn:mrn:iala:wwy:us:navIV:dis1:secnornewengexcecozon:secnornewengtersea:secnornewengsublanact:hamhar","WATERWAY_NAME":"Hampton Harbor","CREATE_DATE":1745957578000,"MODIFIED_DATE":1746017666000,"BEGIN_DATE":1745884800000,"END_DATE":1777507199000,"DESCRIPTION":"General/Bridges/Construction\n\nFrom: 2025-04-29 To: 2026-04-29\n\nLocation:\n42.899° N / 70.8203° W\n42.89746° N / 70.81608° W\n42.89488° N / 70.80814° W\n42.89251° N / 70.81105° W\n42.89471° N / 70.817° W\n42.8953° N / 70.82135° W\n42.899° N / 70.8203° W\n\nBridge Name: Hampton River New Hampshire 1A State Route Bridge\nMariners are urged to exercise extreme caution when exiting or entering Hampton Harbor.  All vessel traffic is restricted to the center span of the bridge due to work trestles which have been constructed alongside the existing Hampton Harbor Bridge, blocking the side channels.  Mariners should anticipate strong currents in the marked navigation channel coupled with very shallow water just outside the marked channel and plan their transits accordingly.  One way vessel traffic is strongly recommended with vessels transiting with the tidal current having priority. Larger vessels will be limited in their maneuverability and once committed to the passage will not be able to stop.  Mariners unfamiliar with the area are encouraged to contact the Harbor Master on VHF-FM Channel 16 for transit guidance, as well as making a radio broadcast of their transit to facilitate safest passage.\n","COORDINATES_JSON":"{\"type\":\"Polygon\",\"coordinates\":[[[-70.8203,42.899],[-70.82135,42.8953],[-70.817,42.89471],[-70.81105,42.89251],[-70.80814,42.89488],[-70.81608,42.89746],[-70.8203,42.899]]]}","COORDINATES_TYPE":"Polygon","DECIMAL_LONGITUDE":null,"DECIMAL_LATITUDE":null}},{"type":"Feature","id":38558,"geometry":{"type":"Polygon","coordinates":[[[-76.20663999999994,36.72294000000005],[-76.21363999999994,36.72228000000007],[-76.21342999999996,36.72175000000004],[-76.21294999999998,36.72118000000006],[-76.20649999999995,36.72118000000006],[-76.20663999999994,36.72294000000005]]]},"properties":{"ESRI_OID":38558,"MSI_UID":38558,"ATU":5,"TITLE":"Great Bridge To Albemarle Sound/General/Bridges/Temp Deviation","STATUS":"Approved","MSI_GROUP":"General","SUB_CATEGORY":"Bridges","TYPE":"Temp Deviation","WTRW_UID":100116382887,"MRN":"urn:mrn:iala:wwy:us:navIV:dis5:secvirsecnorcarexcecozon:secvirsecnorcartersea:secvirsecnorcarexcecozon:oreinl:pamsou:crosou:albsou:grebritoalbsou","WATERWAY_NAME":"Great Bridge To Albemarle Sound","CREATE_DATE":1772895525000,"MODIFIED_DATE":1772905413000,"BEGIN_DATE":1772841600000,"END_DATE":1788479999000,"DESCRIPTION":"The Albemarle & Chesapeake Railroad Bridge at Mile Marker 13.9 on the Albemarle & Chesapeake Canal sustained significant damage on March 6th, 2026. Both the fendering system and lighting should be considered unreliable. Mariners are urged to use extreme caution and transit the area at the slowest safe speed to ensure a safe passage.","COORDINATES_JSON":"{\"type\":\"Polygon\",\"coordinates\":[[[-76.20664,36.72294],[-76.21364,36.72228],[-76.21343,36.72175],[-76.21295,36.72118],[-76.2065,36.72118],[-76.20664,36.72294]]]}","COORDINATES_TYPE":"Polygon","DECIMAL_LONGITUDE":null,"DECIMAL_LATITUDE":null}},{"type":"Feature","id":39235,"geometry":{"type":"Polygon","coordinates":[[[-82.67521999999997,41.461460000000045],[-82.67761999999999,41.45039000000003],[-82.66422999999998,41.45091000000008],[-82.66559999999998,41.46043000000003],[-82.67521999999997,41.461460000000045]]]},"properties":{"ESRI_OID":39235,"MSI_UID":39235,"ATU":9,"TITLE":"Lake Erie - WEST END OF LAKE ERIE/General/Bridges/Closure (Scheduled Or Emergency)","STATUS":"Approved","MSI_GROUP":"General","SUB_CATEGORY":"Bridges","TYPE":"Closure (Scheduled Or Emergency)","WTRW_UID":100116386006,"MRN":"urn:mrn:iala:wwy:us:navIV:dis9:stlawsea:lakont:lowniariv:niariv:lakeri:wesendoflakeri","WATERWAY_NAME":"WEST END OF LAKE ERIE","CREATE_DATE":1773677470000,"MODIFIED_DATE":1773677476000,"BEGIN_DATE":1773619200000,"END_DATE":1789257599000,"DESCRIPTION":"General/Bridges/Closure (Scheduled Or Emergency)\n\nFrom: 2026-03-16 To: 2026-09-12  \n\nLocation:\n41-27-41.256N/082-40-30.792W\n41-27-37.548N/082-39-56.160W\n41-27-03.276N/082-39-51.228W\n41-27-01.404N/082-40-39.432W\n41-27-41.256N/082-40-30.792W\nCedar Point Causeway bridge number 2 is under emergency repairs. Mariners are strongly urged to use caution while transiting in and around the bridge. \n\n","COORDINATES_JSON":"{\"type\":\"Polygon\",\"coordinates\":[[[-82.67522,41.46146],[-82.67762,41.45039],[-82.66423,41.45091],[-82.6656,41.46043],[-82.67522,41.46146]]]}","COORDINATES_TYPE":"Polygon","DECIMAL_LONGITUDE":null,"DECIMAL_LATITUDE":null}},{"type":"Feature","id":39885,"geometry":{"type":"Polygon","coordinates":[[[-87.85729999999995,41.75771000000003],[-87.86664999999994,41.75702000000007],[-87.87070999999997,41.75416000000007],[-87.86735999999996,41.75089000000003],[-87.86186999999995,41.75084000000004],[-87.85366999999997,41.75457000000006],[-87.85729999999995,41.75771000000003]]]},"properties":{"ESRI_OID":39885,"MSI_UID":39885,"ATU":9,"TITLE":"LAKE MICHIGAN - CHICAGO LAKE FRONT/General/Bridges/Inspection","STATUS":"Approved","MSI_GROUP":"General","SUB_CATEGORY":"Bridges","TYPE":"Inspection","WTRW_UID":100116386146,"MRN":"urn:mrn:iala:wwy:us:navIV:dis9:stlawsea:lakont:lowniariv:niariv:lakeri:wesendoflakeri:detriv:lakstcla:stclariv:lakhur:lakmic:chilakfro","WATERWAY_NAME":"CHICAGO LAKE FRONT","CREATE_DATE":1774437811000,"MODIFIED_DATE":1774437820000,"BEGIN_DATE":1774396800000,"END_DATE":1776556799000,"DESCRIPTION":"General/Bridges\n\nFrom: 2026-03-25 To: 2026-04-18\n\nLocation:\n41-45-27.756N/087-51-26.280W\n41-45-16.452N/087-51-13.212W\n41-45-03.024N/087-51-42.732W\n41-45-03.204N/087-52-02.496W\n41-45-14.976N/087-52-14.556W\n41-45-25.272N/087-51-59.940W\n41-45-27.756N/087-51-26.280W\nThe US 12,20,45 NB bridge over Des Plaines River near Willow Springs Illinois from April 13 through April 17, 2026, between the hours of 0900 and 1500, Will Have a snooper truck on the span. There will be spotters to warn inspectors of approaching vessels and move the man lift to allow vessels to pass. All vessels are to proceed with caution. \n\n","COORDINATES_JSON":"{\"type\":\"Polygon\",\"coordinates\":[[[-87.8573,41.75771],[-87.86665,41.75702],[-87.87071,41.75416],[-87.86736,41.75089],[-87.86187,41.75084],[-87.85367,41.75457],[-87.8573,41.75771]]]}","COORDINATES_TYPE":"Polygon","DECIMAL_LONGITUDE":null,"DECIMAL_LATITUDE":null}}]}