{
  "_about": "Curated weed (Verkrautung / herbes aquatiques / waterplanten) reports for the route planner. One record per waterway reach. Hand-maintained: every red or yellow has a source and a date. Nothing here is estimated — waterways without a record are shown GREY (no report), never green. Edit freely; the planner reads this file at load time, no rebuild needed.",
  "_levels": {
    "green": "reports of little or no weed; normal speed",
    "yellow": "noticeable weed: slowing, propeller fouling, cooling-intake vigilance; passable",
    "red": "passage badly impeded or reported blocked/stopped; plan around it in season",
    "grey": "no report on file (default for everything not listed)"
  },
  "_match": "The planner joins on `match` against the OSM waterway name (case-insensitive substring). Optional `from`/`to` narrow the reach; without them the whole named waterway takes the level.",
  "reports": [
    {
      "match": "Canal des Ardennes",
      "cc": "FR",
      "level": "red",
      "months": "May–Oct",
      "date": "2026-09",
      "note": "Heavy weed; skipper report (SV BERTA, 2026). VNF network status 24 Jan 2025 also lists a risk of breach and navigation stoppage between lock 1 (Le Chesne) and lock 26 (Semuy). Vegetation took over during the 2018–2021 closure after the Neuville-Day lock collapse.",
      "sources": [
        "Vilijam Cirkovic, SV BERTA, on-water experience 2026",
        "https://www.vnf.fr/vnf/app/uploads/2019/06/Situation-reseau-au-24-01-2025.pdf",
        "https://france3-regions.franceinfo.fr/grand-est/marne/vitry-le-francois/navigation-a-l-arret-dans-plusieurs-canaux-de-champagne-ardenne-la-secheresse-en-cause-mais-pas-uniquement-2592192.html"
      ]
    },
    {
      "match": "Canal de la Meuse",
      "cc": "FR",
      "level": "red",
      "from": "Sedan",
      "to": "Verdun",
      "months": "Jun–Sep",
      "date": "2024-07",
      "note": "Dense tubular weed carpeting the bottom; 'weeds so thick that the boats all stopped' north of Verdun, speeds 1–3 km/h in bends and above locks. Depth 1.3–1.4 m but prop and keel sit in weed. Also: navigation suspended for drought from 19 Aug 2025 between Saint-Mihiel (lock 10) and Donchery (lock 39).",
      "sources": [
        "https://barges.org/forum/stoppages-hazards-and-levels/29062-conditions-on-the-canal-marne-au-rhin"
      ]
    },
    {
      "match": "Canal de la Meuse",
      "cc": "FR",
      "level": "red",
      "from": "Commercy",
      "to": "Troussey (summit)",
      "months": "Jun–Sep",
      "date": "2024-07",
      "note": "Reported among the worst sections together with Sedan–Verdun.",
      "sources": [
        "https://barges.org/forum/stoppages-hazards-and-levels/29062-conditions-on-the-canal-marne-au-rhin"
      ]
    },
    {
      "match": "Canal de la Marne au Rhin",
      "cc": "FR",
      "level": "yellow",
      "from": "Mauvages tunnel",
      "to": "Toul",
      "months": "Jun–Sep",
      "date": "2024-07",
      "note": "Eastern section significantly worse than the west; speeds down to 4–5 km/h, engine intakes blocked on several boats. VNF weed-cutting crews active.",
      "sources": [
        "https://barges.org/forum/stoppages-hazards-and-levels/29062-conditions-on-the-canal-marne-au-rhin"
      ]
    },
    {
      "match": "Canal de la Marne au Rhin",
      "cc": "FR",
      "level": "green",
      "from": "Vitry-le-François",
      "to": "Mauvages tunnel",
      "months": "Jun–Sep",
      "date": "2024-07",
      "note": "Western section (km 0–60): weed mostly confined to the sides, some floating debris in locks.",
      "sources": [
        "https://barges.org/forum/stoppages-hazards-and-levels/29062-conditions-on-the-canal-marne-au-rhin"
      ]
    },
    {
      "match": "Canal du Rhône au Rhin",
      "cc": "FR",
      "level": "red",
      "from": "Mulhouse",
      "to": "Dannemarie",
      "months": "Jul–Sep",
      "date": "2026-07",
      "note": "'A lot of weed and very low water': VNF says 1.2 m, boats measured 0.9 m between locks and touched bottom; a 1.25 m-draught sailing boat stopped at Dannemarie; VNF warned of closure within a week without rain. Leaking locks (beaver damage).",
      "sources": [
        "https://barges.org/discussion-forum/stoppages-hazards-and-levels/29962-canal-du-rhone-au-rhin"
      ]
    },
    {
      "match": "Canal de Bourgogne",
      "cc": "FR",
      "level": "yellow",
      "from": "Plombières-lès-Dijon",
      "to": "Bretenière",
      "months": "May–Sep",
      "date": "2025",
      "note": "Invasive Myriophyllum heterophyllum around Dijon (Plombières, Dijon, Longvic, Ouges, Bretenière) for several years; VNF + Dijon Métropole cut three times a year incl. winter cuts since 2022. Passable, slowing in season.",
      "sources": [
        "https://www.vnf.fr/vnf/articles/lutte-contre-les-plantes-exotiques-envahissantes-des-operations-de-faucardage-hivernal-sur-le-canal-de-bourgogne/",
        "https://barges.org/discussion-forum-2/waterways-continental-europe/22582-weeds-on-the-canal-de-bourgogne"
      ]
    },
    {
      "match": "Canal de Saint-Quentin",
      "cc": "FR",
      "level": "yellow",
      "from": "lock 18",
      "to": "lock 25 (Saint-Quentin)",
      "months": "Jun–Sep",
      "date": "2022-08",
      "note": "Myriophylle heterophylle; thick carpet around Saint-Quentin town and marina, lock gates fouled; boats passed with reversing and lock-keeper escorts. Summit levels weed-free. VNF grab cranes deployed 2022. Older report — re-check.",
      "sources": [
        "https://barges.org/forum/stoppages-hazards-and-levels/27431-canal-de-saint-quentin-weed",
        "https://barges.org/discussion-forum/stoppages-hazards-and-levels/27680-st-quentin-canal-weed"
      ]
    },
    {
      "match": "Canal du Midi",
      "cc": "FR",
      "level": "green",
      "months": "Jun–Sep",
      "date": "2026-08",
      "note": "No weed issues in the Aug 2026 hydrology minutes — but drought: reservoirs ~58 %, reduced lock hours proposed (9–12, 15–19). Water, not weed, is the constraint.",
      "sources": [
        "https://barges.org/discussion-forum/stoppages-hazards-and-levels/29996-canals-du-midi-garonne-jonction-robine-updated-hydrological-situation-14th"
      ]
    },
    {
      "match": "Veluwemeer",
      "cc": "NL",
      "level": "yellow",
      "months": "Jun–Sep",
      "date": "2025-06",
      "note": "Randmeren pondweed; mowed navigation zones (Veluwemeer, Wolderwijd, Gooimeer, Eemmeer) keep a plant-free channel — stay in the buoyed/mowed lanes. Live map: waterplanten.nu.",
      "sources": [
        "https://www.schapveluwerandmeren.nl/randmeren/nieuws+randmeren/831375.aspx?t=het-maaien-van-waterplanten-in-de-randmeren-gaat-binnenkort-weer-van-start",
        "https://www.watersportverbond.nl/kennisbank/watersportkennis/vaarwegbeheer/waterplanten"
      ]
    },
    {
      "match": "Wolderwijd",
      "cc": "NL",
      "level": "yellow",
      "months": "Jun–Sep",
      "date": "2025-06",
      "note": "See Veluwemeer (Randmeren). Mowing from 2nd week of June 2025.",
      "sources": [
        "https://www.schapveluwerandmeren.nl/randmeren/nieuws+randmeren/831375.aspx?t=het-maaien-van-waterplanten-in-de-randmeren-gaat-binnenkort-weer-van-start"
      ]
    },
    {
      "match": "Gooimeer",
      "cc": "NL",
      "level": "yellow",
      "months": "Jun–Sep",
      "date": "2025-06",
      "note": "See Veluwemeer (Randmeren).",
      "sources": [
        "https://www.watersportverbond.nl/recreatie/in-mijn-regio/regioteam-randmeren/"
      ]
    },
    {
      "match": "Eemmeer",
      "cc": "NL",
      "level": "yellow",
      "months": "Jun–Sep",
      "date": "2025-06",
      "note": "See Veluwemeer (Randmeren).",
      "sources": [
        "https://www.watersportverbond.nl/recreatie/in-mijn-regio/regioteam-randmeren/"
      ]
    },
    {
      "match": "Müritz-Elde-Wasserstraße",
      "cc": "DE",
      "level": "green",
      "date": "2025",
      "note": "No weed problems reported on the MEW; only occasional mild growth elsewhere in the Seenplatte (Schwaanhavel).",
      "sources": [
        "https://www.mecklenburg-schwerin.de/erleben/aktiv-in-der-natur/wasserreviere/mew-und-stoer/",
        "https://www.flussinfo.net/mueritz-elde-wasserstrasse/uebersicht/"
      ]
    },
    {
      "match": "Untere Havel",
      "cc": "DE",
      "level": "green",
      "date": "2025",
      "note": "Weed only on a few side-arm approaches to bivouac sites and launch points; main channel clear.",
      "sources": [
        "https://www.flussinfo.net/untere-havel/uebersicht/"
      ]
    },
    {
      "match": "Canal du Nivernais",
      "cc": "FR",
      "level": "yellow",
      "months": "Jun–Sep",
      "date": "2025",
      "note": "Invasive aquatic plants managed by VNF: experimental early (winter) mowing since March 2022 delays regrowth by 1–2 months; VNF Centre-Bourgogne runs a national plan with new mower-harvester boats (2025 funding). Passable; expect slowing in high summer.",
      "sources": [
        "https://www.francebleu.fr/infos/environnement/dans-l-yonne-une-operation-experimentale-pour-deloger-les-plantes-aquatiques-sur-le-canal-du-1647871360",
        "https://www.vnf.fr/vnf/articles/vnf-renforce-son-action-contre-les-plantes-exotiques-envahissantes-avec-un-nouveau-bateau-faucardeur-moissonneur/"
      ]
    }
  ],
  "_closures": "Navigation closures the planner must route around (cost = impassable while `until` is in the future). Same sourcing rule as weed: every entry has a source and a date.",
  "closures": [
    {
      "match": "Canal de Bourgogne",
      "cc": "FR",
      "from": "Pouilly-en-Auxois",
      "to": "Saint-Jean-de-Losne (Saône)",
      "until": "2027-04-30",
      "date": "2026-02",
      "note": "VNF: southern half closed from Pouilly to the Saône until April 2027 (works).",
      "sources": [
        "https://barges.org/discussion-forum/stoppages-hazards-and-levels/29819-canal-de-bourgogne"
      ]
    },
    {
      "match": "Canal du Centre",
      "cc": "FR",
      "from": "Crissey",
      "to": "Digoin",
      "until": "2026-10-31",
      "date": "2026-08",
      "note": "Drought: entry prohibited from Crissey lock towards Digoin from 10 Aug 2026, full closure from 16 Aug 2026. Re-check at season end.",
      "sources": [
        "https://barges.org/discussion-forum/stoppages-hazards-and-levels/29971-drought-centre-bourgogne"
      ]
    },
    {
      "match": "Canal de la Meuse",
      "cc": "FR",
      "from": "Saint-Mihiel (lock 10)",
      "to": "Donchery (lock 39)",
      "until": "2025-12-31",
      "date": "2025-08",
      "note": "Drought suspension from 19 Aug 2025 — historical, kept as a pattern: this canal closes in dry late summers.",
      "sources": [
        "https://barges.org/forum/stoppages-hazards-and-levels/29062-conditions-on-the-canal-marne-au-rhin"
      ]
    }
  ]
}