About the Flood Database for Oklahoma - Disclaimer
This mapping application was developed by the U.S. Geological Survey (USGS) in partnership with the Oklahoma Department of Transportation (ODOT) Survey and Bridge Divisions.
Though we have carefully reviewed the database for quality, some transcription errors may be present. The user is advised to check the
presented information against the original data source by using the Data Source Location links provided in the ODOT Events and USGS Events tables. The database was last updated
in June 2022 and includes USGS data through September 2021 and ODOT data through June 2022.
The application performs best in Chrome and Safari browsers. Older versions of Internet Explorer (older than IE 10) have difficulty processing the volume of data
contained in the database and may perform poorly and unpredictably on initial page load and during query tasks. Although USGS
intends to make this web server available 24 hours a day, 7 days a week, timely delivery of data and products from this server through
the Internet is not guaranteed. The USGS provides these maps and data as-is for a quick reference, planning tool but assumes no
legal liability or responsibility resulting from the use of this information. For more information contact S. Jerrod Smith at sjsmith@usgs.gov
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Maintenance Division
Search or filter using the ODOT maintenance division (1-8) in which the site is located. Sites outside of Oklahoma (USGS sites only) are
assigned a maintenance division code of 0.
National Bridge Inventory (NBI) Number
Five-digit identification number, for ODOT sites located at an NBI bridge.
County
Search or filter using the county where the site is located. If the site is not in Oklahoma,
the state abbreviation is listed in parentheses after the county name. Only USGS sites are located outside of Oklahoma.
HUC
Search or filter using the eight-digit hydrologic unit code (or Watershed Boundary Dataset subbasin) in which the site is located.
Elevation
Search or filter using the elevation (in feet) of the site, from the USGS National Water Information System (NWIS), referenced to the North American Vertical Datum of 1988. This is the approximate elevation of the site and not the water-surface stage during the flood. Use caution with this value, as this number has no standard source and may change over time as USGS streamflow gages are periodically overhauled.
Drainage Area
Search or filter using the drainage area (in square miles) of the watershed that drains
to the site; the drainage area is unknown for a few sites. To search sites where the drainage
area is not known, enter "-2" in the drainage area search field.
Discharge
Search or filter on the maximum discharge (in cubic feet per second) of the flood. The discharge is not known for ODOT events. To search events where the discharge is not known, enter "-2" in the discharge search field.
Year
Search or filter flood events on the calendar year of occurrence.
Data Source
Search or filter flood events on the data source of each flood event. Data in the flood database comes from two sources: Oklahoma Department of Transportation flood surveys and USGS National Water Information System annual and partial peak streamflow database and indirect discharge measurements.
Station Number
Search or filter using the USGS streamgage station number of the site; not all sites in the database are located at a USGS streamgage. To search sites that are not located at a USGS streamgage, enter "NA" in the Station No. search field.
Site Name
Search or filter on the name of the site, which usually includes the stream name and the nearest town. The search will return any site where any part of the site name matches the entire search criteria.
Site Name
USGS streamgage name of site. The site name usually includes the stream name and the nearest town.
Mile Marker
Search or filter flood events on the highway and mile-post number (mile marker) and the search radius from that point.
Station No.
USGS streamgage station number of site; if site is not located at USGS streamgage then it is listed as "NA."
Latitude
Latitude of site (in decimal degrees) referenced to the North American Datum of 1983.
Longitude
Longitude of site (in decimal degrees) referenced to the North American Datum of 1983.
County
County where site is located. If the site is not in Oklahoma, the state abbreviation is listed in parentheses after the county name.
HUC
Eight-digit hydrologic unit code (or Watershed Boundary Dataset subbasin) in which the site is located.
Drainage Area
The contributing drainage area (in square miles) of the watershed that drains to the site. These values are from StreamStats or the USGS National Water Information System (NWIS). If the drainage area is not known then the drainage area is listed as "-2."
Elevation
The elevation (in feet) of the site, from the USGS National Water Information System (NWIS), referenced to the North American Vertical Datum of 1988. This is the approximate elevation of the site and not the water-surface stage during the flood. Use caution with this value, as this number has no standard source and may change over time as USGS streamflow gages are periodically overhauled.
USGS Streamgage URL
The webpage of the USGS streamgage if the site is located at a USGS streamgage, otherwise listed as "NA."
Date
The date when the flood event occurred at the site in year-month-day format (YYYY/MM/DD). When the day was not known, the first of the month was arbitrarily chosen.
Discharge
The maximum discharge (in cubic feet per second) of the flood; if discharge was not known, then the discharge was listed as "-2."
Data Source Location
The link to the data source publication, webpage, or file. USGS partial peak (secondary flood peaks less than the primary annual flood peak) data are not yet accessible to the public through the USGS webpage.
Headline
The primary flood-related headline from the news publication.
Scope
The counties for which flood-related information in described in the news publication. If more than 4, "Many" is entered.
Publication
The news outlet which published the flood-related information.
Date
The publication date, in year-month-day format (YYYY/MM/DD), of the flood-related information.
Visuals
The number of flood-related visuals (figures, photos, and maps) in the publication.
Highway or Road
The highway, road, or intersection where the flood event occurred, according to the ODOT flood survey. Some of the highways or roads listed may no longer exist.
NHD Stream
The stream name (National Hydrography Dataset and Geographic Names Information System) which flooded, according to the ODOT flood survey.
Flood Elevation
The surveyed elevation in feet (from a standard datum) of the flood water, according to the ODOT flood survey.
Flood Height
The relative surveyed height in feet (from a local datum) of the flood water, according to the ODOT flood survey.
Flood Datum or Reference
The standard datum or local datum (or both) from which flood elevation and/or flood height were measured. This field also includes some information on survey locations and bridge plans.
Discharge Notes
Provides any additional information about the discharge. Codes are listed below. If no code applied, the field was listed as "NA".
1
Discharge is a maximum daily average
2
Discharge is an estimate
3
Discharge affected by dam failure
4
Discharge less than indicated value, which is minimum recordable discharge at this site
5
Discharge affected to unknown degree by regulation or diversion
6
Discharge affected by regulation or diversion
7
Discharge is an historic peak
8
Discharge actually greater than indicated value
9
Discharge due to snowmelt, hurricane, ice-jam or debris dam breakup
10
Discharge not determined, stage-discharge not developed because of regulation within the basin
11
Discharge not determined, stage-discharge not developed
12
Streamgage and datum destroyed by flood, no stage-discharge relation determined
A
Year of occurrence is unknown or not exact
B
Month or day of occurrence is unknown or not exact
C
All or part of the record affected by urbanization, mining, agricultural changes, channelization, or other
D
Base discharge changed during this year
E
Only annual maximum peak available for this year
Gage Height
Stage (in feet) of the maximum discharge of the flood. If the stage is not known, then “UNKNOWN” is listed in the field.
Gage Height Notes
Stage (in feet) of the maximum discharge of the flood. If the stage is not known, then “UNKNOWN” is listed in the field.
1
Gage height affected by backwater
2
Gage height not the maximum for the year
3
Gage height at different site and(or) datum
4
Gage height below minimum recordable elevation
5
Gage height is an estimate
6
Streamgage datum changed during this year
Peak of Water Year
A flag to note if the event was the largest streamflow peak for the water year (October of previous calendar year to September of calendar year). The field is listed as “Y” if an annual (primary) peak event or “N” if a partial (secondary) peak event. If the event is not from the USGS annual and partial peak database, then “NA” is listed in the field.
