[{"data":1,"prerenderedAt":257},["ShallowReactive",2],{"leaderboard-total":3,"spot-seo-portsea-sea-dragon-colony":9,"spot-portsea-sea-dragon-colony":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 Portsea Sea Dragon Colony - How's the Spot","Check snorkeling conditions at Portsea Sea Dragon Colony, Victoria. 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The pier's pylons are encrusted with colourful sponges and host an array of marine life, while the shallow seagrass beds flanking the jetty provide prime habitat for these delicate, leafy fish. A gentle shore entry off the beach or a ladder descent from the pier platforms puts you into clear, protected waters of Port Phillip Bay, typically 1–6 m deep. Guided eco-tours led by local operators provide expert spotting tips, making this an accessible and magical introduction to temperate-water snorkeling.","beginner","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],0.01518292922640474,0.01472168794339704,0.2155732427365139,0.047741180988985624,0.7146294438004043,0.0485776342591161,0.006695082368918923,0.006271020015272035,0.14601752475277144,0.15123126870810275,0.06594009495004506,0.03337316900793892,0.013468462951739814,0.20394125347557102,0.021713807928545815,[91,92,93,94,95,96,97,98,99,100,101,102,103,104,105],302.1631015167527,298.7176095127919,271.3918072985951,156.97924453406665,31.38161022641543,141.6326019564649,171.65689595655897,233.23454694124558,351.7257123300841,251.3588879870997,263.4414581883648,241.78128985020675,0.8177182716631818,156.54102600930918,161.48724200406718,"EOT20","1992-01-01T00:00:00Z",[109,114,118,121,126,129,132,136,139,142,145,150,154],{"name":110,"description":111,"severity":112,"season_start":113,"season_end":113},"Tidal Currents Under Pier","Strong currents can run beneath the jetty, especially on mid-to-high tides, making swimming difficult for inexperienced snorkellers.","warning",null,{"name":115,"description":116,"severity":117,"season_start":113,"season_end":113},"Fishing Activity","The pier is a popular fishing spot; snorkellers must avoid fishing lines, hooks, and submerged tackle near the pylons.","caution",{"name":119,"description":120,"severity":117,"season_start":113,"season_end":113},"Boat Traffic","Vessels berth alongside the pier and boats transit the area—snorkellers should stay clear of the navigation channel.",{"name":122,"description":123,"severity":117,"season_start":124,"season_end":125},"Swell & Wind Chop","Portsea Pier is exposed to south and south-easterly winds and swells; rough conditions can reduce visibility and create challenging surface chop.",6,12,{"name":127,"description":128,"severity":112,"season_start":113,"season_end":113},"Under-pier current","Tidal currents flowing under and around the pier structure can be strong, making swimming against them difficult, especially mid-tide.",{"name":130,"description":131,"severity":112,"season_start":113,"season_end":113},"Currents under the pier","Strong tidal currents can run between the jetty pylons, making swimming and snorkelling tricky, especially on mid-to-large tides.",{"name":133,"description":134,"severity":117,"season_start":135,"season_end":125},"Cold water temperatures","Water temps range 17–22°C (warmest Jan–Mar). Outside summer, cold can cause rapid fatigue.",4,{"name":137,"description":138,"severity":117,"season_start":113,"season_end":113},"Current under jetty","Moderate currents can flow beneath the pier platforms, making swimming and staying in position challenging, especially on days with strong tidal movement.",{"name":140,"description":141,"severity":117,"season_start":113,"season_end":113},"Tidal current under pier","Moderate tidal currents can run beneath the pier, making swimming and staying in position challenging, especially on mid-tides.",{"name":143,"description":144,"severity":117,"season_start":113,"season_end":113},"Choppy conditions in wind","Choppy surface conditions and reduced visibility on windy days, especially with northerly or westerly winds.",{"name":146,"description":147,"severity":117,"season_start":148,"season_end":149},"Cold water temperature","Water temperatures range 17-22°C; cold shock risk without adequate wetsuit protection, particularly outside summer months.",5,11,{"name":151,"description":152,"severity":117,"season_start":148,"season_end":153},"Strong swells after dredging","Port Phillip channel deepening has increased swell frequency and intensity at Portsea Pier, which can affect water conditions.",9,{"name":155,"description":156,"severity":117,"season_start":113,"season_end":113},"Fishing line entanglement","Portsea Pier is a popular fishing jetty; stray fishing lines and hooks pose a snag risk. Stay clear of active anglers and keep to the outer weed beds.",{"directions":158,"parking":159,"facilities":160,"fees":165,"access_method":166},"Portsea is ~95 minutes drive from Melbourne CBD via the M1 and Nepean Highway. Head to Portsea Pier on the Mornington Peninsula. The snorkel site is accessed from the pier platforms (ladders) or directly from the adjacent beach.","Limited parking (~12 spots) directly opposite the pier. Overflow parking available on the opposite side of the road. Can be very crowded on weekends and holidays.",[161,162,163,164],"toilets","showers","picnic_tables","parking","Free for independent snorkeling. Guided tours (e.g. Bayplay's Snorkel with Dragons) cost approx. $70-90 per person and include gear hire.","shore_entry","2026-07-27T02:58:11.493055Z","2026-08-04T05:36:16.070511Z",{"verdict":170,"evaluated_at":171,"models":172},"no_go","2026-10-03T02:19:33.186003Z",[173,180,185],{"model_name":174,"is_favourable":175,"value":176,"threshold":177,"unit":178,"operator":179},"Wind Speed",false,10.59,10,"kn","lte",{"model_name":181,"is_favourable":175,"value":182,"threshold":183,"unit":184,"operator":179},"Wave Height",0.75,0.5,"m",{"model_name":186,"is_favourable":175,"value":187,"threshold":40,"unit":188,"operator":189},"Visibility",0.85,"","gte",{"verdict":170,"rating":191,"evaluated_at":171,"generated_at":171,"source":192,"confidence":193,"visibility":196,"parameters":197,"models_passed":5,"models_total":148},"Poor","precomputed",{"level":194,"value":195},"High",100,{"score":187,"rating":113,"confidence":113},[198,199,204,207,212],{"name":181,"value":182,"label":113,"unit":184,"favourable":175,"score":36,"optimal_max":183,"marginal_max":36},{"name":200,"value":201,"label":113,"unit":202,"favourable":175,"score":36,"optimal_max":203,"marginal_max":125},"Swell Period",11.95,"s",8,{"name":174,"value":205,"label":113,"unit":178,"favourable":175,"score":36,"optimal_max":177,"marginal_max":206},10.593928,15,{"name":208,"value":209,"label":113,"unit":210,"favourable":175,"score":5,"optimal_max":148,"marginal_max":211},"Precipitation",32.1,"mm",20,{"name":213,"value":113,"label":214,"unit":188,"favourable":175,"score":36,"optimal_max":113,"marginal_max":113},"Tidal Phase","flood",[216,224,227,234,239,244,249],{"id":217,"image_url":13,"sort_order":5,"is_primary":218,"moderation_status":219,"license":220,"license_url":221,"attribution":222,"author_name":223},"b1315bfb-d0dc-4c30-9fab-4ae2414d5a02",true,"approved","CC BY-SA 4.0","https:\u002F\u002Fcreativecommons.org\u002Flicenses\u002Fby-sa\u002F4.0\u002F","Photo by Openfj0re","Openfj0re",{"id":225,"image_url":226,"sort_order":36,"is_primary":175,"moderation_status":219,"license":220,"license_url":221,"attribution":222,"author_name":223},"94ab4627-4f14-4dc9-b6eb-4e76bb00879b","https:\u002F\u002Fhowsthespot.syd1.cdn.digitaloceanspaces.com\u002Fspots\u002Fimport_portsea-sea-dragon-colony_1_c7710b577ccc.jpg",{"id":228,"image_url":229,"sort_order":40,"is_primary":175,"moderation_status":219,"license":230,"license_url":231,"attribution":232,"author_name":233},"e040c1ec-dba0-4089-a947-85d9732a8b79","https:\u002F\u002Fhowsthespot.syd1.cdn.digitaloceanspaces.com\u002Fspots\u002Fimport_portsea-sea-dragon-colony_2_b3ddb3f8da59.jpg","CC BY 2.0","https:\u002F\u002Fcreativecommons.org\u002Flicenses\u002Fby\u002F2.0\u002F","Photo by Aenneken from Kaarst, Germany","Aenneken from Kaarst, Germany",{"id":235,"image_url":236,"sort_order":43,"is_primary":175,"moderation_status":219,"license":220,"license_url":221,"attribution":237,"author_name":238},"cb44d80e-07b0-4315-ae78-5865c7b031b6","https:\u002F\u002Fhowsthespot.syd1.cdn.digitaloceanspaces.com\u002Fspots\u002Fimport_portsea-sea-dragon-colony_3_88cc92279c19.jpg","Photo by Kgbo","Kgbo",{"id":240,"image_url":241,"sort_order":135,"is_primary":175,"moderation_status":219,"license":220,"license_url":221,"attribution":242,"author_name":243},"182ba75f-c31e-47c6-b780-d0635ce09cd1","https:\u002F\u002Fhowsthespot.syd1.cdn.digitaloceanspaces.com\u002Fspots\u002Fimport_portsea-sea-dragon-colony_4_1020e0174e27.jpg","Photo by Simone Kealy","Simone Kealy",{"id":245,"image_url":246,"sort_order":148,"is_primary":175,"moderation_status":219,"license":220,"license_url":221,"attribution":247,"author_name":248},"d7a4c8b7-9fd3-4dfd-b436-ba51e71a1dd8","https:\u002F\u002Fhowsthespot.syd1.cdn.digitaloceanspaces.com\u002Fspots\u002Fimport_portsea-sea-dragon-colony_5_8844ef25d60d.jpg","Photo by Essiewingrove","Essiewingrove",{"id":250,"image_url":251,"sort_order":124,"is_primary":175,"moderation_status":219,"license":220,"license_url":221,"attribution":252,"author_name":253},"e4edf698-1f62-460b-bff5-48439220e150","https:\u002F\u002Fhowsthespot.syd1.cdn.digitaloceanspaces.com\u002Fspots\u002Fimport_portsea-sea-dragon-colony_6_f4b5d8f9255e.jpg","Photo by hemant garg","hemant garg",{"display_name":255},"Daniel","unverified",1791009187909]