{"name":"Sanilac Petroglyphs State Park","slug":"sanilac-petroglyphs-state-park","river_id":null,"basis":"public-land","bbox":[-83.03759,43.65204,-83.0177,43.65989],"generated_at":"2026-09-22T23:32:00Z","breaks":[58,64,70],"thermal":{"Cold":{"color":"#0f6e56","dark":"#3f9b7f"},"Cold-transitional":{"color":"#3d7c9c","dark":"#6aa6c4"},"Cool":{"color":"#c98a3b","dark":"#d9a256"},"Warm":{"color":"#a94b32","dark":"#c46a4f"},"Unknown":{"color":"#9a9384","dark":"#7c766a"}},"sites":[],"river":{"type":"FeatureCollection","features":[{"type":"Feature","properties":{"july_class":"Warm","stream_id":"south-fork-cass-river"},"geometry":{"type":"MultiLineString","coordinates":[[[-82.96333,43.64782000000003],[-82.96646,43.64836999999994],[-82.97116,43.647449999999985],[-82.9762,43.64835000000001]],[[-83.00024,43.64111],[-83.00651,43.64129000000002]],[[-83.01928,43.64981999999994],[-83.02252,43.652350000000055]],[[-83.01832,43.64903999999999],[-83.01928,43.64981999999994]],[[-83.00651,43.64129000000002],[-83.00908,43.64216999999998],[-83.01573000000002,43.64811999999999]],[[-83.01643000000001,43.64895999999998],[-83.01665,43.64920000000001],[-83.01765,43.648899999999976],[-83.01832,43.64903999999999]],[[-83.01573000000002,43.64811999999999],[-83.01643000000001,43.64895999999998]],[[-82.95797704739468,43.64709425375328],[-82.96333,43.64782000000003]],[[-83.02252,43.652350000000055],[-83.01963000000002,43.654849999999996],[-83.02062,43.65598999999998],[-83.02593,43.65608000000001],[-83.02749,43.654530000000065],[-83.03134,43.654789999999984]],[[-82.9958,43.64265999999997],[-82.99965,43.64201],[-83.00024,43.64111]],[[-82.9762,43.64835000000001],[-82.98213,43.647430000000035],[-82.98528,43.64466000000001],[-82.99052000000002,43.643639999999984],[-82.99011,43.64307],[-82.99204,43.64223999999994],[-82.99357,43.642709999999994],[-82.9958,43.64265999999997]]]}},{"type":"Feature","properties":{"july_class":"Warm","stream_id":"north-branch-cass-river"},"geometry":{"type":"MultiLineString","coordinates":[[[-83.03134,43.654789999999984],[-83.03404,43.653450000000014],[-83.03853000000001,43.653170000000024],[-83.04226,43.651279999999986]],[[-82.97322,43.68343999999996],[-82.97826,43.67968000000004],[-82.98066,43.678959999999975],[-82.98316000000001,43.67581999999997],[-82.98343,43.67266000000002]],[[-83.07162,43.64187000000001],[-83.07378,43.641070000000006],[-83.07523,43.641740000000034]],[[-82.96417991963789,43.68668191214439],[-82.96549,43.687459999999966]],[[-83.05605,43.64588999999999],[-83.06325,43.64584000000005],[-83.06372,43.64262000000001]],[[-83.04635,43.64844999999999],[-83.04853,43.646279999999976]],[[-83.04853,43.646279999999976],[-83.05304,43.64622000000007]],[[-83.03072,43.655110000000015],[-83.03134,43.654789999999984]],[[-83.05316,43.646279999999976],[-83.05515,43.646430000000045]],[[-83.01389,43.66019999999997],[-83.02386,43.65889000000002]],[[-83.05304,43.64622000000007],[-83.05316,43.646279999999976]],[[-82.98343,43.67266000000002],[-82.98421,43.67030000000002],[-82.98797,43.667920000000045]],[[-83.02386,43.65889000000002],[-83.0242,43.65874999999998]],[[-83.08706,43.642530000000036],[-83.09509,43.64146000000002]],[[-83.06372,43.64262000000001],[-83.06905,43.64235]],[[-83.04226,43.651279999999986],[-83.0456,43.649469999999994]],[[-83.07523,43.641740000000034],[-83.07867,43.64103999999999],[-83.08033,43.64222999999998],[-83.08706,43.642530000000036]],[[-83.05515,43.646430000000045],[-83.05605,43.64588999999999]],[[-83.01291,43.660119999999985],[-83.01369,43.66013000000001],[-83.01389,43.66019999999997]],[[-82.96549,43.687459999999966],[-82.97322,43.68343999999996]],[[-83.06905,43.64235],[-83.07162,43.64187000000001]],[[-83.0456,43.649469999999994],[-83.04635,43.64844999999999]],[[-82.98797,43.667920000000045],[-82.98911,43.66673],[-82.99212,43.666039999999974],[-82.99321,43.66448000000002],[-82.99802,43.66407000000002],[-83.00409,43.660849999999975],[-83.00987,43.66127999999993],[-83.01291,43.660119999999985]],[[-83.0242,43.65874999999998],[-83.03072,43.655110000000015]],[[-83.09509,43.64146000000002],[-83.09645422783984,43.64082788608005]]]}}]},"land":{"type":"FeatureCollection","features":[{"type":"Feature","properties":{"name":"Sanilac Petroglyphs State Park","owner":"Michigan DNR","subject":true},"geometry":{"type":"Polygon","coordinates":[[[-83.037558,43.652036000000045],[-83.037589,43.65566499999994],[-83.027676,43.65596200000005],[-83.027711,43.65961400000001],[-83.017786,43.65989299999998],[-83.017703,43.65262700000002],[-83.037558,43.652036000000045]]]}},{"type":"Feature","properties":{"name":"Sanilac State Game Area","owner":"Local Government land"},"geometry":{"type":"MultiPolygon","coordinates":[[[[-82.987518,43.64333500000002],[-82.98739,43.639234999999964],[-82.997423,43.638954999999996],[-82.997484,43.64120700000001],[-82.987518,43.64333500000002]]],[[[-83.00772500000001,43.66390099999994],[-82.997863,43.66431399999998],[-82.997802,43.66071200000002],[-83.007617,43.660290999999994],[-83.00772500000001,43.66390099999994]]],[[[-83.007617,43.660290999999994],[-83.007613,43.656729999999975],[-83.017624,43.656449],[-83.017592,43.65996600000002],[-83.007617,43.660290999999994]]],[[[-83.022243,43.62331800000003],[-83.041551,43.62288999999998],[-83.05264,43.640658],[-83.042383,43.641061],[-83.042319,43.63390200000001],[-83.027292,43.63425599999999],[-83.024345,43.627117999999996],[-83.017252,43.62729099999999],[-83.018896,43.619975999999966],[-83.022243,43.62331800000003]]],[[[-83.017744,43.65209800000006],[-83.04788000000002,43.64820200000001],[-83.047886,43.655353999999974],[-83.037737,43.65565599999996],[-83.037631,43.65181799999999],[-83.017744,43.65209800000006]]],[[[-83.077662,43.64545599999995],[-83.052833,43.647879999999944],[-83.052638,43.64403399999999],[-83.057171,43.64389299999998],[-83.05695,43.640674000000004],[-83.077532,43.64034899999998],[-83.077662,43.64545599999995]]]]}}]}}