{ "lid": "ATIT2", "usgsId": "08159000", "reachId": "5781369", "name": "Onion Creek at US 183", "description": "", "rfc": { "abbreviation": "WGRFC", "name": "West Gulf River Forecast Center" }, "wfo": { "abbreviation": "EWX", "name": "New Braunfels" }, "state": { "abbreviation": "TX", "name": "Texas" }, "county": "Travis", "timeZone": "CST6CDT", "latitude": 30.177777777778, "longitude": -97.688333333333, "pedts": { "observed": "HGIRG", "forecast": "HGIFF" }, "status": { "observed": { "primary": 4.5, "primaryUnit": "ft", "secondary": 0.0025, "secondaryUnit": "kcfs", "floodCategory": "no_flooding", "validTime": "2026-10-07T22:20:00Z" }, "forecast": { "primary": -999, "primaryUnit": "", "secondary": -999, "secondaryUnit": "", "floodCategory": "fcst_not_current", "validTime": "0001-01-01T00:00:00Z" } }, "flood": { "stageUnits": "ft", "flowUnits": "cfs", "categories": { "major": { "stage": 27, "flow": -9999 }, "moderate": { "stage": 23, "flow": -9999 }, "minor": { "stage": 17, "flow": -9999 }, "action": { "stage": 15, "flow": -9999 } }, "lro": { "minorCS": "0.1595", "moderateCS": "0.0987", "majorCS": "0.0847", "producedTime": "2026-09-28T17:12:10Z", "interval": "OND" }, "crests": { "historic": [ { "occurredTime": "2013-10-31T14:30:00Z", "stage": 40.15, "flow": 135000, "preliminary": "R", "olddatum": false }, { "occurredTime": "2015-10-30T19:40:00Z", "stage": 39.22, "flow": 120284, "preliminary": "P", "olddatum": false }, { "occurredTime": "1921-09-09T00:00:00Z", "stage": 38, "flow": 138000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1869-07-03T00:00:00Z", "stage": 38, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-11-16T06:00:00Z", "stage": 36.5, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1998-10-17T18:30:00Z", "stage": 32, "flow": 51000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1991-12-21T02:00:00Z", "stage": 30.5, "flow": 44200, "preliminary": "O", "olddatum": false }, { "occurredTime": "2013-10-13T17:45:00Z", "stage": 28.87, "flow": 40127, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-05-04T14:25:00Z", "stage": 26.99, "flow": 26518, "preliminary": "O", "olddatum": false }, { "occurredTime": "1981-06-11T18:30:00Z", "stage": 25.96, "flow": 26100, "preliminary": "O", "olddatum": false }, { "occurredTime": "2016-05-27T06:24:00Z", "stage": 25.13, "flow": 20345, "preliminary": "O", "olddatum": false }, { "occurredTime": "1997-06-09T16:00:00Z", "stage": 23.8, "flow": 17500, "preliminary": "O", "olddatum": false }, { "occurredTime": "2002-07-02T00:00:00Z", "stage": 23.8, "flow": 17500, "preliminary": "O", "olddatum": false }, { "occurredTime": "2004-11-22T11:15:00Z", "stage": 23.78, "flow": 17560, "preliminary": "O", "olddatum": false }, { "occurredTime": "2007-01-13T18:45:00Z", "stage": 22.97, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-05-26T18:30:00Z", "stage": 22.93, "flow": 15100, "preliminary": "O", "olddatum": false }, { "occurredTime": "1982-05-13T00:00:00Z", "stage": 21.28, "flow": 13300, "preliminary": "O", "olddatum": false }, { "occurredTime": "2016-05-20T01:10:00Z", "stage": 21.19, "flow": 11773, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-05-09T08:40:00Z", "stage": 20.69, "flow": 10823, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-05-26T03:15:00Z", "stage": 20.21, "flow": 10300, "preliminary": "O", "olddatum": false }, { "occurredTime": "1987-06-04T00:00:00Z", "stage": 19.79, "flow": 10900, "preliminary": "O", "olddatum": false }, { "occurredTime": "2017-08-27T09:10:00Z", "stage": 19.16, "flow": 8872, "preliminary": "P", "olddatum": false }, { "occurredTime": "2021-10-14T16:35:00Z", "stage": 17.92, "flow": 7878, "preliminary": "O", "olddatum": false } ], "recent": [ { "occurredTime": "2021-10-14T16:35:00Z", "stage": 17.92, "flow": 7878, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-05-09T08:40:00Z", "stage": 20.69, "flow": 10823, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-05-04T14:25:00Z", "stage": 26.99, "flow": 26518, "preliminary": "O", "olddatum": false }, { "occurredTime": "2017-08-27T09:10:00Z", "stage": 19.16, "flow": 8872, "preliminary": "P", "olddatum": false }, { "occurredTime": "2016-05-27T06:24:00Z", "stage": 25.13, "flow": 20345, "preliminary": "O", "olddatum": false }, { "occurredTime": "2016-05-20T01:10:00Z", "stage": 21.19, "flow": 11773, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-10-30T19:40:00Z", "stage": 39.22, "flow": 120284, "preliminary": "P", "olddatum": false }, { "occurredTime": "2015-05-26T03:15:00Z", "stage": 20.21, "flow": 10300, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-05-26T18:30:00Z", "stage": 22.93, "flow": 15100, "preliminary": "O", "olddatum": false }, { "occurredTime": "2013-10-31T14:30:00Z", "stage": 40.15, "flow": 135000, "preliminary": "R", "olddatum": false }, { "occurredTime": "2013-10-13T17:45:00Z", "stage": 28.87, "flow": 40127, "preliminary": "O", "olddatum": false }, { "occurredTime": "2007-01-13T18:45:00Z", "stage": 22.97, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2004-11-22T11:15:00Z", "stage": 23.78, "flow": 17560, "preliminary": "O", "olddatum": false }, { "occurredTime": "2002-07-02T00:00:00Z", "stage": 23.8, "flow": 17500, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-11-16T06:00:00Z", "stage": 36.5, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1998-10-17T18:30:00Z", "stage": 32, "flow": 51000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1997-06-09T16:00:00Z", "stage": 23.8, "flow": 17500, "preliminary": "O", "olddatum": false }, { "occurredTime": "1991-12-21T02:00:00Z", "stage": 30.5, "flow": 44200, "preliminary": "O", "olddatum": false }, { "occurredTime": "1987-06-04T00:00:00Z", "stage": 19.79, "flow": 10900, "preliminary": "O", "olddatum": false }, { "occurredTime": "1982-05-13T00:00:00Z", "stage": 21.28, "flow": 13300, "preliminary": "O", "olddatum": false }, { "occurredTime": "1981-06-11T18:30:00Z", "stage": 25.96, "flow": 26100, "preliminary": "O", "olddatum": false }, { "occurredTime": "1921-09-09T00:00:00Z", "stage": 38, "flow": 138000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1869-07-03T00:00:00Z", "stage": 38, "flow": 0, "preliminary": "O", "olddatum": false } ] }, "lowWaters": { "historic": [] }, "impacts": [ { "stage": 54, "statement": "Height of instruments inside gauge house." }, { "stage": 47, "statement": "Catastrophic flooding in neighborhoods of Onion Creek, with depths of 8 to 10 feet in Timber Creek, 10 to 15 feet in Onion Creek Forest, 10 to 12 feet in Yarrabee Bend, 2 feet in Onion Creek Plantations, 10 feet on the southeast side of Silverstone, 6 to 10 feet in Perkins Valley, and 5 to 10 feet in Onion Creek Club. The US Highway 183 bridge over Onion Creek and McKinney Falls Parkway are flooded. Major flooding of the south side of ABIA, including portions of FM 973. USGS 500 year storm floodplain." }, { "stage": 41, "statement": "Major flooding in Onion Creek neighborhoods, with depths up to 6 feet in Onion Creek Plantations, 6 to 9 feet in Onion Creek Forest, 6 to 8 feet in Yarrabee Bend, 7 feet on the east side of Silverstone, and 4 to 11 feet in Timber Creek near Pearce Lane. Onion Creek Club, Perkins Valley neighborhood, Pleasant Valley Road, Pearce Lane, FM 973, Burleson Road, and Emma Browning Avenue are flooded. The south access to ABIA is flooded as is the South Austin WWTP. Flood of record is 40.15 on October 31, 2013." }, { "stage": 38, "statement": "Major flooding in Onion Creek neighborhoods with depths up to 5 feet in Onion Creek Forest, 3 to 10 feet in Timber Creek near Pearce Lane, 4 feet in Onion Creek Plantations, 1 to 2 feet in Perkins Valley, and 2 to 3 feet in Yarrabee Bend. Access to the Onion Creek neighborhoods is now limited. Flooding of the South Austin WWTP is imminent. Much of FM 973 and parts of Burleson Road are flooded. The 6100 block of East William Cannon Drive and Pleasant Valley Road are flooded." }, { "stage": 35, "statement": "Major flooding. Water enters homes in portions of several Onion Creek neighborhoods with 2 to 5 feet of water in parts of Onion Creek Plantations, Onion Creek Forest, Yarrabee Bend, Silverstone, and Perkins Valley. Up to 8 feet of water impacts homes in Timber Creek near Pearce Lane. FM 973, Burleson Road, William Cannon Drive, and Pleasant Valley Road are flooded, and the south Access to ABIA is blocked." }, { "stage": 32, "statement": "Major flooding begins to flood the homes lower portions of Timber Creek, and the homes along Pinhurst Drive and Champions Lane. Vehicle access becomes limited to portions of Onion Creek Plantations, and street flooding begins to impact the Perkins Valley subdivision. Major portions of Brandt Road, Bluff Springs Road, and William Cannon Drive are flooded. Richard Moya Park is severely flooded, and water is spilling onto Burleson Road." }, { "stage": 29, "statement": "Major flooding impacts several neighborhoods along Onion Creek. Homes on Pinehurst Drive and Champions Lane are threatened by flood waters. Portions of Timber Creek, Onion Creek Forest, Onion Creek Plantations, and Yarrabee Bend South subdivisions are flooded. Major portions of Bluff Springs Road, East William Cannon Drive and Brandt Road near Onion Creek are flooded, and Burleson Road begins to flood near Richard Moya Park. " }, { "stage": 28, "statement": "Major flooding impacts several neighborhoods along Onion Creek. Homes on Dixie Drive near Foyt Ct. are close to flooding. Homes on Pinehurst Drive and Champions Lane are surrounded by flood waters, but structures are not expected to be flooded at this level. Low portions of Timber Creek, Onion Creek Forest, Onion Creek Plantations, and Yarrabee Bend South subdivisions are flooded. Portions of Bluff Springs Road, East William Cannon Drive and Brandt Road near Onion Creek are flooded and impassable. " }, { "stage": 27, "statement": "Major flooding impacts several neighborhoods along Onion Creek. The Timber Creek neighborhood is starting to flood, and lowland areas in the Onion Creek Forest, Onion Creek Plantations, and Yarrabee Bend South subdivisions begin to flood. The 6100 block of East William Cannon Drive, and the 3100 block of Brandt Road may be flooded and impassable. Bluff Springs Road near the bridge at Onion Creek may also begin to flood. Much of Richard Moya Park is flooded." }, { "stage": 23, "statement": "Moderate lowland flooding is well into the flood plain. Richard Moya Park on Burleson Road is flooded. Water is out of banks near Champions Lane, but no residential structures in neighborhoods along Onion Creek are impacted at this level." }, { "stage": 20, "statement": "Minor lowland flooding threatens secondary roads, but neighborhoods along Onion Creek are not affected. Upstream, the 12000 block of Old San Antonio Road is likely flooded and impassable." }, { "stage": 17, "statement": "The 12000 block of Old San Antonio Road upstream may be flooded. Neighborhoods along Onion Creek are not affected." }, { "stage": 15, "statement": "Flow exceeds lowest sections of the banks. Low street crossings and bridges are threatened." } ] }, "images": { "probability": { "weekint": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/ATIT2.SSTG.prob.weekint.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/ATIT2.QINE.prob.weekint.gif", "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/ATIT2.volume.prob.weekint.gif" }, "entperiod": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/ATIT2.SSTG.exceed.90day.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/ATIT2.QINE.exceed.90day.gif", "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/ATIT2.volume.exceed.90day.gif" }, "shortrange": "https://water.noaa.gov/resources/probabilistic/short_term/ATIT2.shortrange.hefs.png" }, "hydrograph": { "default": "https://water.noaa.gov/resources/hydrographs/atit2_hg.png", "floodcat": "https://water.noaa.gov/resources/hydrographs/atit2_record.png" }, "photos": [] }, "dataAttribution": [ { "abbrev": "US Geological Survey", "text": "USGS--Water Resources of the United States", "title": "US Geological Survey", "url": "https://waterdata.usgs.gov/nwis" }, { "abbrev": "USGS", "text": "08159000", "title": "Observations courtesy of U.S. Geological Survey", "url": "https://waterdata.usgs.gov/nwis/inventory/?site_no=08159000" } ], "impactsLowWaters": [], "normalThreshold": { "value": 0, "units": "ft" }, "hydronotes": [ { "statement": "River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time.", "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": 443.28 } ] }, "horizontal": { "value": [] }, "notes": { "value": [] } }, "inundation": { "enabled": true, "url": "https://mapservices.weather.noaa.gov/static/rest/services/NWS_FIM/FIM_atit2/MapServer", "zeroDatum": { "value": 443.122, "datum": "NAVD88" }, "downloads": { "depthGrids": "https://water.noaa.gov/resources/downloads/fim/atit2/atit2_shapefiles.zip", "images": "https://water.noaa.gov/resources/downloads/fim/atit2/atit2_images.zip", "kmz": "https://water.noaa.gov/resources/downloads/fim/atit2/atit2_kmz.zip" }, "siteSpecificInfo": "", "dataAttribution": [ { "text": "State", "title": "TX State Partner", "url": "", "image": "https://water.noaa.gov/resources/fim/" } ] }, "upstreamLid": "ONIT2", "downstreamLid": "", "inService": { "enabled": true, "message": "" }, "lowThreshold": null, "forecastReliability": "Forecasts are issued as needed during times of high water, but are not routinely available.", "TruncateObs": "-1", "TruncateFcst": "5", "ObservedFloodCategory": "no_flooding", "ForecastFloodCategory": "fcst_not_current" }