[{"data":1,"prerenderedAt":199},["ShallowReactive",2],{"leaderboard-total":3,"spot-seo-margaret-brock-reef":9,"spot-margaret-brock-reef":51},{"entries":4,"total":5,"period":6,"type":7,"generated_at":8},[],0,"all_time","reports","2026-10-03T06:32:05.526386Z",{"title":10,"description":11,"canonical_url":12,"og_image":13,"structured_data":14,"breadcrumbs":44},"Snorkeling Conditions at Margaret Brock Reef - How's the Spot","Check snorkeling conditions at Margaret Brock Reef, South Australia. Hazardous conditions, water 15.0°C, waves 1.55m","https:\u002F\u002Fhowsthespot.com\u002Fspots\u002Fmargaret-brock-reef","https:\u002F\u002Fhowsthespot.syd1.cdn.digitaloceanspaces.com\u002Fspots\u002Fimport_margaret-brock-reef_0_01eb0699275f.jpg",[15,28],{"@context":16,"@type":17,"name":18,"description":19,"url":12,"geo":20,"address":24},"https:\u002F\u002Fschema.org","Place","Margaret Brock Reef","Margaret Brock Reef is a shallow, high-wave-energy reef system located about 5 km west of Cape Jaffa on South Australia's Limestone Coast. Named after the three-masted barque that struck and sank h...",{"@type":21,"latitude":22,"longitude":23},"GeoCoordinates",-36.95,139.55,{"@type":25,"addressRegion":26,"addressCountry":27},"PostalAddress","South Australia","Australia",{"@context":16,"@type":29,"name":30,"description":11,"url":12,"breadcrumb":31},"WebPage","Snorkeling Conditions at Margaret Brock Reef",{"@context":16,"@type":32,"itemListElement":33},"BreadcrumbList",[34,39,42],{"@type":35,"position":36,"name":37,"item":38},"ListItem",1,"Home","https:\u002F\u002Fhowsthespot.com",{"@type":35,"position":40,"name":26,"item":41},2,"https:\u002F\u002Fhowsthespot.com\u002Fexplore?region=south-australia",{"@type":35,"position":43,"name":18,"item":12},3,[45,47,49],{"label":37,"href":46},"\u002F",{"label":26,"href":48},"\u002Fexplore?region=south-australia",{"label":18,"href":50},"\u002Fspots\u002Fmargaret-brock-reef",{"id":52,"name":18,"slug":53,"latitude":22,"longitude":23,"description":54,"difficulty":55,"image_url":13,"status":56,"tide_constituents":57,"hazard_entries":108,"access_info_structured":132,"area_boundary":140,"routes":140,"created_at":141,"updated_at":142,"today_conditions":143,"today_verdict_view":163,"images":189,"submitted_by":196,"region_name":26,"verification_status":198,"verified_at":140,"disputed":149,"verifier_count":5,"last_verified_display_name":140},"9d6a9ffd-d858-48de-beea-46d2223b4651","margaret-brock-reef","Margaret Brock Reef is a shallow, high-wave-energy reef system located about 5 km west of Cape Jaffa on South Australia's Limestone Coast. Named after the three-masted barque that struck and sank here in 1852, this site is a dedicated sanctuary zone for southern rock lobsters — renowned as one of the best places in SA to see massive, pristine-sized lobsters in their natural habitat. The reef lies in just 2–10 metres of water with scattered wreck remnants (anchors, chains, fittings) visible among the rocky crevices and boulders. High marine productivity makes for thrilling drift snorkels over a reef teeming with life.","advanced","published",{"name":58,"amplitude":74,"phase":90,"latitude":22,"model":106,"epoch":107},[59,60,61,62,63,64,65,66,67,68,69,70,71,72,73],"2N2","J1","K1","K2","M2","M4","MF","MM","N2","O1","P1","Q1","S1","S2","T2",[75,76,77,78,79,80,81,82,83,84,85,86,87,88,89],0.006406404939834775,0.009242078147915922,0.17146745400246788,0.0429752216838671,0.14031220437253653,0.013878626298828953,0.004369730488464364,0.004163066254057709,0.006187308549934357,0.12427776982667212,0.053599847683968395,0.031278823885105105,0.014408832896018697,0.15656324532792443,0.011001240048504533,[91,92,93,94,95,96,97,98,99,100,101,102,103,104,105],141.75355754686507,271.57207075004084,253.22153481899747,119.50201065423074,60.65195515087119,166.82392288053643,222.72898899716807,273.1500974318708,204.5603427721211,235.08064835049788,245.87423825008943,222.99878133657967,21.280625531016607,117.489205618013,134.12242648027615,"EOT20","1992-01-01T00:00:00Z",[109,115,120,123,127],{"name":110,"description":111,"severity":112,"season_start":113,"season_end":114},"High Wave Energy \u002F Swell","Exposed offshore reef subject to strong Southern Ocean swell and surf, making conditions challenging and unsafe in rough weather.","danger",6,9,{"name":116,"description":117,"severity":118,"season_start":36,"season_end":119},"Strong Currents","Tidal and wind-driven currents can sweep snorkelers away from the reef; drift snorkeling awareness required.","warning",12,{"name":121,"description":122,"severity":118,"season_start":36,"season_end":119},"Remote Location","Located 5 km offshore from Cape Jaffa with limited emergency services and marine rescue access.",{"name":124,"description":125,"severity":126,"season_start":36,"season_end":119},"Sharp Reef \u002F Rock","Barnacle-encrusted limestone reef with sharp edges and crevices that can cause cuts if contact is made.","caution",{"name":128,"description":129,"severity":126,"season_start":130,"season_end":131},"Cold Water Temperatures","Southern Ocean waters remain cold year-round (12–18°C); wetsuit exposure risk for extended sessions.",5,10,{"directions":133,"parking":134,"facilities":135,"fees":138,"access_method":139},"The reef lies approximately 5 km west of Cape Jaffa, off the Kingston SE \u002F Limestone Coast region. Boat access is required — launch from Cape Jaffa boat ramp or Kingston SE. The site is exposed and should only be attempted in calm conditions with local knowledge.","Parking available at the Cape Jaffa boat ramp area.",[136,137],"parking","boat_ramp","No direct fees for snorkeling. A marine park permit may be required for nearby sanctuary zones — check SA Marine Parks regulations.","boat",null,"2026-07-27T02:57:16.421353Z","2026-08-04T05:34:24.990847Z",{"verdict":144,"evaluated_at":145,"models":146},"no_go","2026-10-03T02:18:39.690457Z",[147,153,158],{"model_name":148,"is_favourable":149,"value":150,"threshold":131,"unit":151,"operator":152},"Wind Speed",false,11.95,"kn","lte",{"model_name":154,"is_favourable":149,"value":155,"threshold":156,"unit":157,"operator":152},"Wave Height",1.55,0.5,"m",{"model_name":159,"is_favourable":149,"value":160,"threshold":40,"unit":161,"operator":162},"Visibility",0.67,"","gte",{"verdict":144,"rating":164,"evaluated_at":145,"generated_at":145,"source":165,"confidence":166,"visibility":169,"parameters":170,"models_passed":36,"models_total":130},"Hazardous","precomputed",{"level":167,"value":168},"High",100,{"score":160,"rating":140,"confidence":140},[171,172,177,180,185],{"name":154,"value":155,"label":140,"unit":157,"favourable":149,"score":5,"optimal_max":156,"marginal_max":36},{"name":173,"value":174,"label":140,"unit":175,"favourable":149,"score":36,"optimal_max":176,"marginal_max":119},"Swell Period",10.1,"s",8,{"name":148,"value":178,"label":140,"unit":151,"favourable":149,"score":36,"optimal_max":131,"marginal_max":179},11.954616000000001,15,{"name":181,"value":182,"label":140,"unit":183,"favourable":149,"score":36,"optimal_max":130,"marginal_max":184},"Precipitation",14.6,"mm",20,{"name":186,"value":140,"label":187,"unit":161,"favourable":188,"score":43,"optimal_max":140,"marginal_max":140},"Tidal Phase","slack",true,[190],{"id":191,"image_url":13,"sort_order":5,"is_primary":188,"moderation_status":192,"license":193,"license_url":140,"attribution":194,"author_name":195},"f82e7e76-4dbe-4fbd-9ca0-2895d337030d","approved","CC0","Photo by South Australian government photographer","South Australian government photographer",{"display_name":197},"Daniel","unverified",1791009172542]