{
  "lid": "HAMO1",
  "usgsId": "03274000",
  "reachId": "3885878",
  "name": "Great Miami River at Hamilton",
  "description": "",
  "rfc": {
    "abbreviation": "OHRFC",
    "name": "Ohio River Forecast Center"
  },
  "wfo": {
    "abbreviation": "ILN",
    "name": "Wilmington"
  },
  "state": {
    "abbreviation": "OH",
    "name": "Ohio"
  },
  "county": "Butler",
  "timeZone": "EST5EDT",
  "latitude": 39.391111111111,
  "longitude": -84.572222222222,
  "pedts": {
    "observed": "HGIRG",
    "forecast": "HGIFF"
  },
  "status": {
    "observed": {
      "primary": 62.96,
      "primaryUnit": "ft",
      "secondary": 1.37,
      "secondaryUnit": "kcfs",
      "floodCategory": "no_flooding",
      "validTime": "2026-10-30T11:30:00Z"
    },
    "forecast": {
      "primary": 63,
      "primaryUnit": "ft",
      "secondary": 1.46,
      "secondaryUnit": "kcfs",
      "floodCategory": "no_flooding",
      "validTime": "2026-10-31T06:00:00Z"
    }
  },
  "flood": {
    "stageUnits": "ft",
    "flowUnits": "cfs",
    "categories": {
      "major": {
        "stage": 89.5,
        "flow": -9999
      },
      "moderate": {
        "stage": 82,
        "flow": -9999
      },
      "minor": {
        "stage": 75,
        "flow": -9999
      },
      "action": {
        "stage": 73,
        "flow": -9999
      }
    },
    "lro": {
      "minorCS": "0.1",
      "moderateCS": "< 0.05",
      "majorCS": "< 0.05",
      "producedTime": "2026-10-29T12:03:15Z",
      "interval": "NDJ"
    },
    "crests": {
      "historic": [
        {
          "occurredTime": "1959-01-21T00:00:00Z",
          "stage": 79.2,
          "flow": 108000,
          "preliminary": "O",
          "olddatum": true
        },
        {
          "occurredTime": "1943-03-19T00:00:00Z",
          "stage": 76.6,
          "flow": 78800,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1929-02-26T00:00:00Z",
          "stage": 76.5,
          "flow": 70300,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1937-01-22T00:00:00Z",
          "stage": 76.33,
          "flow": 73900,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1952-01-27T00:00:00Z",
          "stage": 75.95,
          "flow": 71600,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "2004-01-05T09:00:00Z",
          "stage": 75.84,
          "flow": 73500,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "2005-01-06T15:00:00Z",
          "stage": 75.57,
          "flow": 71500,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1968-05-24T00:00:00Z",
          "stage": 75.41,
          "flow": 69300,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "2008-03-19T17:30:00Z",
          "stage": 75.15,
          "flow": 67535,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1963-03-05T00:00:00Z",
          "stage": 74.96,
          "flow": 66600,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1949-01-06T00:00:00Z",
          "stage": 74.5,
          "flow": 0,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1945-01-06T00:00:00Z",
          "stage": 74.5,
          "flow": 0,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1996-04-29T00:00:00Z",
          "stage": 74.26,
          "flow": 63800,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1982-01-31T00:00:00Z",
          "stage": 73.75,
          "flow": 58100,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "2025-04-05T15:30:00Z",
          "stage": 73.53,
          "flow": 0,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1961-05-08T00:00:00Z",
          "stage": 73.42,
          "flow": 57600,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "2005-01-14T11:30:00Z",
          "stage": 72.87,
          "flow": 0,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1949-01-24T00:00:00Z",
          "stage": 72.65,
          "flow": 42200,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1995-08-10T00:00:00Z",
          "stage": 72.1,
          "flow": 0,
          "preliminary": "O",
          "olddatum": false
        }
      ],
      "recent": [
        {
          "occurredTime": "2025-04-05T15:30:00Z",
          "stage": 73.53,
          "flow": 0,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "2008-03-19T17:30:00Z",
          "stage": 75.15,
          "flow": 67535,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "2005-01-14T11:30:00Z",
          "stage": 72.87,
          "flow": 0,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "2005-01-06T15:00:00Z",
          "stage": 75.57,
          "flow": 71500,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "2004-01-05T09:00:00Z",
          "stage": 75.84,
          "flow": 73500,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1996-04-29T00:00:00Z",
          "stage": 74.26,
          "flow": 63800,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1995-08-10T00:00:00Z",
          "stage": 72.1,
          "flow": 0,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1982-01-31T00:00:00Z",
          "stage": 73.75,
          "flow": 58100,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1968-05-24T00:00:00Z",
          "stage": 75.41,
          "flow": 69300,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1963-03-05T00:00:00Z",
          "stage": 74.96,
          "flow": 66600,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1961-05-08T00:00:00Z",
          "stage": 73.42,
          "flow": 57600,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1959-01-21T00:00:00Z",
          "stage": 79.2,
          "flow": 108000,
          "preliminary": "O",
          "olddatum": true
        },
        {
          "occurredTime": "1952-01-27T00:00:00Z",
          "stage": 75.95,
          "flow": 71600,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1949-01-24T00:00:00Z",
          "stage": 72.65,
          "flow": 42200,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1949-01-06T00:00:00Z",
          "stage": 74.5,
          "flow": 0,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1945-01-06T00:00:00Z",
          "stage": 74.5,
          "flow": 0,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1943-03-19T00:00:00Z",
          "stage": 76.6,
          "flow": 78800,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1937-01-22T00:00:00Z",
          "stage": 76.33,
          "flow": 73900,
          "preliminary": "O",
          "olddatum": false
        },
        {
          "occurredTime": "1929-02-26T00:00:00Z",
          "stage": 76.5,
          "flow": 70300,
          "preliminary": "O",
          "olddatum": false
        }
      ]
    },
    "lowWaters": {
      "historic": []
    },
    "impacts": [
      {
        "stage": 90,
        "statement": "Water would overtop levees on the south side of Hamilton.  Water levels exceeding 90 feet would top all levees protecting the business district resulting in major flooding near the river channel through the entire city.  Major flooding occurs, especially near New Miami and Ross, where homes and businesses along the river are suffering major inundation."
      },
      {
        "stage": 89,
        "statement": "This elevation is at the top of some levees protecting mainly the southern areas of Hamilton.  In addition to major inundation of communities such as New Miami and near Ross, river stages above this level would inundate some areas of Hamilton south of Pershing Avenue along and near Neilan Boulevard.  Widespread inundation occurs near Joyce Park and Joe Nuxhall Lane."
      },
      {
        "stage": 84,
        "statement": "Flooding worsens in lowland areas in southern Butler County between State Route 128 and the Great Miami River.  Flooding also worsens along the river near Ross.  The City of Hamilton itself is protected from river flooding up to 89 feet for locations in the southern part of the city, with most of the city protected at stages up to 90 feet. "
      },
      {
        "stage": 82,
        "statement": "Lowland areas in southern Butler County between State Route 128 and the Great Miami River become flooded.  Flooding also occurs along the river near Ross.  The City of Hamilton itself is protected from river levels up to 89 feet in the southern sections of the city, while most of the city is protected up to 90 feet. "
      },
      {
        "stage": 77,
        "statement": "Locations along the river mainly south of the City of Hamilton become flooded.  Flooding continues to impact New Miami and Ross.  Southern portions of the City of Hamilton are protected by flood walls up to 89 feet, with the majority of the city protected up to a stage of 90 feet. "
      },
      {
        "stage": 75,
        "statement": "Lowland areas south of Hamilton to Ross continue to flood.  Evacuations are possible near New Miami and near Ross.  The City of Hamilton itself is protected from river levels up to 89 feet for locations in the southern part of the city, with most of the city protected at stages up to 90 feet."
      },
      {
        "stage": 74,
        "statement": "Lowland flooding begins about one mile north of High Street in Hamilton and near Ross, about five miles downstream.  Low-lying homes near New Miami and other low-lying areas along the river channel are impacted.  The City of Hamilton itself is protected from river levels up to 89 feet for locations in the southern part of the city, with most of the city protected at stages up to 90 feet."
      }
    ]
  },
  "images": {
    "probability": {
      "weekint": {
        "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/HAMO1.SSTG.prob.weekint.gif",
        "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/HAMO1.QINE.prob.weekint.gif",
        "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/HAMO1.volume.prob.weekint.gif"
      },
      "entperiod": {
        "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/HAMO1.SSTG.exceed.90day.gif",
        "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/HAMO1.QINE.exceed.90day.gif",
        "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/HAMO1.volume.exceed.90day.gif"
      },
      "shortrange": "https://water.noaa.gov/resources/probabilistic/short_term/HAMO1.shortrange.hefs.png"
    },
    "hydrograph": {
      "default": "https://water.noaa.gov/resources/hydrographs/hamo1_hg.png",
      "floodcat": "https://water.noaa.gov/resources/hydrographs/hamo1_record.png"
    },
    "photos": [
      {
        "id": "226303797795820014",
        "type": "Feature",
        "geometry": {
          "type": "Point",
          "coordinates": [
            39.391111111111,
            -84.572222222222
          ]
        },
        "properties": {
          "image": "https://water.noaa.gov/resources/photos/hamo1/226303797795820014.jpeg",
          "caption": "photo of Hamilton river gage"
        }
      },
      {
        "id": "231791421675344366",
        "type": "Feature",
        "geometry": {
          "type": "Point",
          "coordinates": [
            39.391111111111,
            -84.572222222222
          ]
        },
        "properties": {
          "image": "https://water.noaa.gov/resources/photos/hamo1/231791421675344366.gif",
          "caption": "How to convert Hamilton gage readings"
        }
      }
    ]
  },
  "dataAttribution": [
    {
      "abbrev": "Miami Conservancy District",
      "text": "Miami Conservancy District",
      "title": "Miami Conservancy District",
      "url": "https://www.mcdwater.org/about-mcd/history-construction"
    },
    {
      "abbrev": "USGS",
      "text": "03274000",
      "title": "Observations courtesy of U.S. Geological Survey",
      "url": "https://waterdata.usgs.gov/nwis/inventory/?site_no=03274000"
    },
    {
      "abbrev": "COE",
      "text": "Website",
      "title": "Observations courtesy of U.S. Army Corps of Engineers",
      "url": "https://rivergages.mvr.usace.army.mil/WaterControl/stationinfo2.cfm?sid=03274000&fid=&dt=S"
    }
  ],
  "impactsLowWaters": [],
  "normalThreshold": {
    "value": 0,
    "units": "ft"
  },
  "hydronotes": [
    {
      "statement": "Stage may be affected by ice.",
      "effective": "0101",
      "expiration": "1212"
    },
    {
      "statement": "River Forecasts typically include ONLY 2 days of future rain from <u>forecast issuance time</u> (lower right of graph). Occasionally 3 days of future rain included.",
      "effective": "0101",
      "expiration": "1231"
    }
  ],
  "datums": {
    "vertical": {
      "value": [
        {
          "label": "North American Vertical Datum of 1988",
          "abbrev": "NAVD88",
          "description": "A fixed reference for elevations determined by geodetic leveling. The datum was derived from a general adjustment of the first-order terrestrial leveling nets of the United States, Canada, and Mexico. In the adjustment, only the height of the primary tidal bench mark, referenced to the International Great Lakes Datum of 1985 (IGLD 85) local mean sea level height value, at Father Point, Rimouski, Quebec, Canada was held fixed, thus providing minimum constraint. NAVD 88 and IGLD 85 are identical. However, NAVD 88 bench mark values are given in Helmert orthometric height units while IGLD 85 values are in dynamic heights. See International Great Lakes Datum of 1985, National Geodetic Vertical Datum of 1929, and geopotential difference. NAVD 88 should not be used as Mean Sea Level.",
          "value": 499.19
        }
      ]
    },
    "horizontal": {
      "value": []
    },
    "notes": {
      "value": []
    }
  },
  "inundation": {
    "enabled": false,
    "url": "",
    "zeroDatum": null,
    "downloads": null,
    "siteSpecificInfo": "",
    "dataAttribution": []
  },
  "upstreamLid": "MDTO1",
  "downstreamLid": "MIAO1",
  "inService": {
    "enabled": true,
    "message": ""
  },
  "lowThreshold": {
    "units": "ft",
    "value": 61
  },
  "forecastReliability": "Forecasts are issued routinely year-round.",
  "TruncateObs": "-1",
  "TruncateFcst": "5",
  "ObservedFloodCategory": "no_flooding",
  "ForecastFloodCategory": "no_flooding"
}