{
  "schema_version": 1,
  "dataset_id": "isle-royale-official-portages-2026",
  "title": "Isle Royale National Park Official Portages — 2026 Greenstone",
  "authority": "National Park Service — Isle Royale National Park",
  "source_vintage": 2026,
  "source_url": "https://www.nps.gov/isro/upload/Web-Accessible_Optimized_2026-Greenstone.pdf",
  "source_page": 6,
  "source_context_url": "https://www.nps.gov/isro/greenstone-newspaper.htm",
  "source_last_checked": "2026-08-31",
  "disclaimer": "Distances, elevation changes, and terrain descriptions are transcribed from the NPS 2026 Greenstone portage table. Search anchors are approximate waterbody/place centroids used only to help associate a user-drawn leg with an official portage; they are not landing coordinates and must never be used as navigation geometry.",
  "summary": {
    "official_portage_count": 16,
    "published_portage_miles_total": 9.5,
    "longest_portage_miles": 2,
    "greatest_published_elevation_change_ft": 175
  },
  "endpoint_anchors": {
    "malone-bay": {
      "label": "Malone Bay",
      "lat": 47.98044,
      "lng": -88.8123,
      "role": "waterbody-centroid-not-landing",
      "match_radius_miles": 1
    },
    "siskiwit-lake": {
      "label": "Siskiwit Lake",
      "lat": 48.00125,
      "lng": -88.79723,
      "role": "waterbody-centroid-not-landing",
      "match_radius_miles": 3
    },
    "intermediate-lake": {
      "label": "Intermediate Lake",
      "lat": 48.030726,
      "lng": -88.727174,
      "role": "waterbody-centroid-not-landing",
      "match_radius_miles": 0.8
    },
    "lake-richie": {
      "label": "Lake Richie",
      "lat": 48.043807,
      "lng": -88.69536,
      "role": "waterbody-centroid-not-landing",
      "match_radius_miles": 1
    },
    "wood-lake": {
      "label": "Wood Lake",
      "lat": 48.003494,
      "lng": -88.744244,
      "role": "waterbody-centroid-not-landing",
      "match_radius_miles": 0.8
    },
    "lake-whittlesey": {
      "label": "Lake Whittlesey",
      "lat": 48.00644,
      "lng": -88.70721,
      "role": "waterbody-centroid-not-landing",
      "match_radius_miles": 0.8
    },
    "chippewa-harbor": {
      "label": "Chippewa Harbor",
      "lat": 48.02891,
      "lng": -88.65041,
      "role": "waterbody-place-centroid-not-landing",
      "match_radius_miles": 1.2
    },
    "moskey-basin": {
      "label": "Moskey Basin",
      "lat": 48.069,
      "lng": -88.6296,
      "role": "waterbody-centroid-not-landing",
      "match_radius_miles": 1.2
    },
    "lake-lesage": {
      "label": "Lake LeSage",
      "lat": 48.05518,
      "lng": -88.709,
      "role": "waterbody-centroid-not-landing",
      "aliases": [
        "LeSage Lake",
        "Lake Lesage"
      ],
      "match_radius_miles": 0.8
    },
    "lake-livermore": {
      "label": "Lake Livermore",
      "lat": 48.064733,
      "lng": -88.7084,
      "role": "waterbody-centroid-not-landing",
      "match_radius_miles": 0.7
    },
    "chickenbone-lake": {
      "label": "Chickenbone Lake",
      "lat": 48.06734,
      "lng": -88.71318,
      "role": "waterbody-centroid-not-landing",
      "match_radius_miles": 1
    },
    "mccargoe-cove": {
      "label": "McCargoe Cove",
      "lat": 48.09877,
      "lng": -88.6973,
      "role": "waterbody-centroid-not-landing",
      "aliases": [
        "McCargo Cove"
      ],
      "match_radius_miles": 1.2
    },
    "pickerel-cove": {
      "label": "Pickerel Cove",
      "lat": 48.12877,
      "lng": -88.63786,
      "role": "waterbody-centroid-not-landing",
      "aliases": [
        "Dory Bay"
      ],
      "match_radius_miles": 0.9
    },
    "lane-cove": {
      "label": "Lane Cove",
      "lat": 48.14571,
      "lng": -88.55924,
      "role": "waterbody-centroid-not-landing",
      "match_radius_miles": 1
    },
    "stockly-bay": {
      "label": "Stockly Bay",
      "lat": 48.15154,
      "lng": -88.53924,
      "role": "waterbody-centroid-not-landing",
      "match_radius_miles": 1
    },
    "five-finger-bay": {
      "label": "Five Finger Bay",
      "lat": 48.16654,
      "lng": -88.51257,
      "role": "waterbody-centroid-not-landing",
      "aliases": [
        "Five Fingers Bay"
      ],
      "match_radius_miles": 1.2
    },
    "duncan-bay": {
      "label": "Duncan Bay",
      "lat": 48.1506,
      "lng": -88.5225,
      "role": "place-centroid-not-landing",
      "match_radius_miles": 1.2
    },
    "tobin-harbor": {
      "label": "Tobin Harbor",
      "lat": 48.14432,
      "lng": -88.49785,
      "role": "waterbody-centroid-not-landing",
      "match_radius_miles": 1.2
    },
    "rock-harbor": {
      "label": "Rock Harbor",
      "lat": 48.13639,
      "lng": -88.49586,
      "role": "waterbody-centroid-not-landing",
      "match_radius_miles": 1.5
    }
  },
  "portages": [
    {
      "number": 1,
      "id": "malone-bay-siskiwit-lake",
      "official_label": "Malone Bay - Siskiwit Lake",
      "from": "Malone Bay",
      "to": "Siskiwit Lake",
      "from_anchor_id": "malone-bay",
      "to_anchor_id": "siskiwit-lake",
      "distance_miles": 0.3,
      "elevation_change_ft": 40,
      "terrain": "Gradual Slope",
      "terrain_tags": [
        "gradual"
      ],
      "route_family": "southwest-interior",
      "endpoint_basis": "official-label"
    },
    {
      "number": 2,
      "id": "siskiwit-lake-intermediate-lake",
      "official_label": "Siskiwit Lake - Intermediate Lake",
      "from": "Siskiwit Lake",
      "to": "Intermediate Lake",
      "from_anchor_id": "siskiwit-lake",
      "to_anchor_id": "intermediate-lake",
      "distance_miles": 0.4,
      "elevation_change_ft": 40,
      "terrain": "Gradual ups and downs",
      "terrain_tags": [
        "gradual",
        "rolling"
      ],
      "route_family": "southwest-interior",
      "endpoint_basis": "official-label"
    },
    {
      "number": 3,
      "id": "intermediate-lake-lake-richie",
      "official_label": "Intermediate Lake - Lake Richie",
      "from": "Intermediate Lake",
      "to": "Lake Richie",
      "from_anchor_id": "intermediate-lake",
      "to_anchor_id": "lake-richie",
      "distance_miles": 0.6,
      "elevation_change_ft": 120,
      "terrain": "Hilly and wooded",
      "terrain_tags": [
        "hilly",
        "wooded"
      ],
      "route_family": "southwest-interior",
      "endpoint_basis": "official-label"
    },
    {
      "number": 4,
      "id": "wood-lake-lake-whittlesey",
      "official_label": "Wood Lake - Lake Whittlesey",
      "from": "Wood Lake",
      "to": "Lake Whittlesey",
      "from_anchor_id": "wood-lake",
      "to_anchor_id": "lake-whittlesey",
      "distance_miles": 0.6,
      "elevation_change_ft": 80,
      "terrain": "Rolling",
      "terrain_tags": [
        "rolling"
      ],
      "route_family": "southwest-interior",
      "endpoint_basis": "official-label"
    },
    {
      "number": 5,
      "id": "lake-whittlesey-chippewa-harbor",
      "official_label": "Lake Whittlesey - Chippewa Harbor",
      "from": "Lake Whittlesey",
      "to": "Chippewa Harbor",
      "from_anchor_id": "lake-whittlesey",
      "to_anchor_id": "chippewa-harbor",
      "distance_miles": 0.6,
      "elevation_change_ft": 140,
      "terrain": "Steep grades and rocky",
      "terrain_tags": [
        "steep",
        "rocky"
      ],
      "route_family": "southwest-interior",
      "endpoint_basis": "official-label"
    },
    {
      "number": 6,
      "id": "chippewa-harbor-lake-richie",
      "official_label": "Chippewa Harbor - Lake Richie",
      "from": "Chippewa Harbor",
      "to": "Lake Richie",
      "from_anchor_id": "chippewa-harbor",
      "to_anchor_id": "lake-richie",
      "distance_miles": 1.2,
      "elevation_change_ft": 160,
      "terrain": "Hilly",
      "terrain_tags": [
        "hilly"
      ],
      "route_family": "indian-portage",
      "endpoint_basis": "official-label",
      "detail_url": "https://www.nps.gov/thingstodo/portage-from-lake-richie-to-chippewa-harbor.htm"
    },
    {
      "number": 7,
      "id": "moskey-basin-lake-richie",
      "official_label": "Moskey Basin - Lake Richie",
      "from": "Moskey Basin",
      "to": "Lake Richie",
      "from_anchor_id": "moskey-basin",
      "to_anchor_id": "lake-richie",
      "distance_miles": 2,
      "elevation_change_ft": 120,
      "terrain": "Gradual but long",
      "terrain_tags": [
        "gradual",
        "long"
      ],
      "route_family": "lake-richie-access",
      "endpoint_basis": "official-label"
    },
    {
      "number": 8,
      "id": "lake-richie-lake-lesage",
      "official_label": "Lake Richie - Lake LeSage",
      "from": "Lake Richie",
      "to": "Lake LeSage",
      "from_anchor_id": "lake-richie",
      "to_anchor_id": "lake-lesage",
      "distance_miles": 0.6,
      "elevation_change_ft": 100,
      "terrain": "Steep grades, wet",
      "terrain_tags": [
        "steep",
        "wet"
      ],
      "route_family": "indian-portage",
      "endpoint_basis": "official-label",
      "detail_url": "https://www.nps.gov/thingstodo/portage-from-lake-lesage-to-lake-richie.htm"
    },
    {
      "number": 9,
      "id": "lake-lesage-lake-livermore",
      "official_label": "Lake LeSage - Lake Livermore",
      "from": "Lake LeSage",
      "to": "Lake Livermore",
      "from_anchor_id": "lake-lesage",
      "to_anchor_id": "lake-livermore",
      "distance_miles": 0.4,
      "elevation_change_ft": 80,
      "terrain": "Steep grades, wet",
      "terrain_tags": [
        "steep",
        "wet"
      ],
      "route_family": "indian-portage",
      "endpoint_basis": "official-label",
      "detail_url": "https://www.nps.gov/thingstodo/portage-from-lake-livermore-to-lake-lesage.htm"
    },
    {
      "number": 10,
      "id": "lake-livermore-chickenbone-lake",
      "official_label": "Lake Livermore - Chickenbone Lake",
      "from": "Lake Livermore",
      "to": "Chickenbone Lake",
      "from_anchor_id": "lake-livermore",
      "to_anchor_id": "chickenbone-lake",
      "distance_miles": 0.2,
      "elevation_change_ft": 40,
      "terrain": "Steep but short",
      "terrain_tags": [
        "steep",
        "short"
      ],
      "route_family": "indian-portage",
      "endpoint_basis": "official-label",
      "detail_url": "https://www.nps.gov/thingstodo/portage-from-chickenbone-lake-to-lake-livermore.htm"
    },
    {
      "number": 11,
      "id": "chickenbone-lake-mccargoe-cove",
      "official_label": "Chickenbone Lake - McCargoe Cove",
      "from": "Chickenbone Lake",
      "to": "McCargoe Cove",
      "from_anchor_id": "chickenbone-lake",
      "to_anchor_id": "mccargoe-cove",
      "distance_miles": 1.2,
      "elevation_change_ft": 80,
      "terrain": "Hilly",
      "terrain_tags": [
        "hilly"
      ],
      "route_family": "indian-portage",
      "endpoint_basis": "official-label",
      "detail_url": "https://www.nps.gov/thingstodo/portage-from-mccargoe-cove-to-chickenbone-lake.htm"
    },
    {
      "number": 12,
      "id": "pickerel-cove",
      "official_label": "Pickerel Cove",
      "from": "Lake Superior",
      "to": "Pickerel Cove",
      "from_anchor_id": null,
      "to_anchor_id": "pickerel-cove",
      "distance_miles": 0.1,
      "elevation_change_ft": 10,
      "terrain": "Short and sweet",
      "terrain_tags": [
        "short"
      ],
      "route_family": "north-shore-short-carries",
      "endpoint_basis": "map-inferred-exterior-endpoint",
      "endpoint_note": "The 2026 Greenstone table names this portage only as Pickerel Cove. The external endpoint is represented as Lake Superior for planning/search matching; no landing coordinate is asserted."
    },
    {
      "number": 13,
      "id": "lane-cove-stockly-bay",
      "official_label": "Lane Cove - Stockly Bay",
      "from": "Lane Cove",
      "to": "Stockly Bay",
      "from_anchor_id": "lane-cove",
      "to_anchor_id": "stockly-bay",
      "distance_miles": 0.1,
      "elevation_change_ft": 8,
      "terrain": "Short and sweet",
      "terrain_tags": [
        "short"
      ],
      "route_family": "northeast-harbors",
      "endpoint_basis": "official-label"
    },
    {
      "number": 14,
      "id": "five-finger-bay-duncan-bay",
      "official_label": "Five Finger Bay - Duncan Bay",
      "from": "Five Finger Bay",
      "to": "Duncan Bay",
      "from_anchor_id": "five-finger-bay",
      "to_anchor_id": "duncan-bay",
      "distance_miles": 0.2,
      "elevation_change_ft": 8,
      "terrain": "Short and sweet",
      "terrain_tags": [
        "short"
      ],
      "route_family": "northeast-harbors",
      "endpoint_basis": "official-label"
    },
    {
      "number": 15,
      "id": "duncan-bay-tobin-harbor",
      "official_label": "Duncan Bay - Tobin Harbor",
      "from": "Duncan Bay",
      "to": "Tobin Harbor",
      "from_anchor_id": "duncan-bay",
      "to_anchor_id": "tobin-harbor",
      "distance_miles": 0.8,
      "elevation_change_ft": 175,
      "terrain": "Extremely steep",
      "terrain_tags": [
        "extremely-steep",
        "steep"
      ],
      "route_family": "northeast-harbors",
      "endpoint_basis": "official-label"
    },
    {
      "number": 16,
      "id": "tobin-harbor-rock-harbor",
      "official_label": "Tobin Harbor - Rock Harbor",
      "from": "Tobin Harbor",
      "to": "Rock Harbor",
      "from_anchor_id": "tobin-harbor",
      "to_anchor_id": "rock-harbor",
      "distance_miles": 0.2,
      "elevation_change_ft": 40,
      "terrain": "Gradual up and down",
      "terrain_tags": [
        "gradual",
        "rolling"
      ],
      "route_family": "northeast-harbors",
      "endpoint_basis": "official-label"
    }
  ],
  "anchor_note": "Endpoint search anchors are deliberately generous waterbody/place centroids so a user click near a landing can be associated with a named corridor. Matching also requires the mapped trail length to agree with the NPS published distance; anchors never define route geometry."
}