Streamflow - Revision history

JeffreyJLukas: /* Additional resources */

2024-10-21T20:56:40Z

Additional resources

← Older revision		Revision as of 16:56, 21 October 2024
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	==Additional resources==		==Additional resources==

	===State of the Science ~~Report~~===		===[https://wwa.colorado.edu/resources/colorado-river-resources/CRBreport Colorado River Basin Climate and Hydrology: State of the Science report]===

	[https://wwa.colorado.edu/publications/reports/CRBreport/ColoRiver_StateOfScience_WWA_2020_Chapter_5.pdf Chapter 5] of the State of the Science report, Section 5.3 describes streamflow observations and measurement and adjustment procedures in much greater detail.		[https://wwa.colorado.edu/publications/reports/CRBreport/ColoRiver_StateOfScience_WWA_2020_Chapter_5.pdf Chapter 5] of the State of the Science report, Section 5.3 describes streamflow observations and measurement and adjustment procedures in much greater detail.

JeffreyJLukas: /* Data and tools */

2024-01-19T18:30:59Z

Data and tools

← Older revision		Revision as of 14:30, 19 January 2024
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	<onlyinclude>		<onlyinclude>
	===Gaged streamflow - Real-time and Historical===		===Gaged streamflow - Real-time and Historical===

			====[https://dashboard.waterdata.usgs.gov/app/nwd/en/?aoi=default USGS National Water Dashboard]====
			This US interactive map shows in the default view all active USGS gages and current streamflow. It can also show many other hydrologic parameters measured at USGS gages and stations, including those related to surface water, groundwater, and water quality, and can also overlay current weather radar and recent precipitation. Mouse-over a gage to see a popup with its name and the data for the selected layer; click on that gage to open the real-time data page for that gage.

	====[https://waterwatch.usgs.gov/index.php?mt=real&st=h14%2C15&usst=&ushuc=&xorms=ms&go=GO&id=wwlmap_viewer USGS Water Watch interactive map]====		====[https://waterwatch.usgs.gov/index.php?mt=real&st=h14%2C15&usst=&ushuc=&xorms=ms&go=GO&id=wwlmap_viewer USGS Water Watch interactive map]====
	This interactive map ~~shows~~ over 530 active gages across the Colorado River Basin, and hundreds more in adjacent basins (Figure 2). Zoom in to see all gages, mouse-over a gage to see a yellow popup with its name and current streamflow statistics, and click on that gage's name within that popup to open the real-time data page for that gage. On the real-time data page, click "Change time span" to plot and retrieve historical gaged flow data.		This interactive map is similar to the one above; the linked view of the map highlights over 530 active gages across the Colorado River Basin, and hundreds more in adjacent basins (Figure 2). Zoom in to see all gages, mouse-over a gage to see a yellow popup with its name and current streamflow statistics, and click on that gage's name within that popup to open the real-time data page for that gage. On the real-time data page, click "Change time span" to plot and retrieve historical gaged flow data.

	====[https://maps.waterdata.usgs.gov/mapper/nwisquery.html?URL=https://waterdata.usgs.gov/usa/nwis/uv?referred_module=sw&huc2_cd=14&huc2_cd=15&site_tp_cd=ST&site_tp_cd=ST-CA&site_tp_cd=ST-DCH&site_tp_cd=FA-DV&site_tp_cd=FA-OF&index_pmcode_00060=1&format=sitefile_output&group_key=huc_cd&sitefile_output_format=xml&column_name=agency_cd&column_name=site_no&column_name=station_nm&range_selection=days&period=7&begin_date=2022-04-07&end_date=2022-04-14&date_format=YYYY-MM-DD&rdb_compression=file&list_of_search_criteria=huc2_cd%2Csite_tp_cd%2Crealtime_parameter_selection&column_name=site_tp_cd&column_name=dec_lat_va&column_name=dec_long_va&column_name=agency_use_cd USGS NWIS: Map View - Colorado River Basin]====		====[https://maps.waterdata.usgs.gov/mapper/nwisquery.html?URL=https://waterdata.usgs.gov/usa/nwis/uv?referred_module=sw&huc2_cd=14&huc2_cd=15&site_tp_cd=ST&site_tp_cd=ST-CA&site_tp_cd=ST-DCH&site_tp_cd=FA-DV&site_tp_cd=FA-OF&index_pmcode_00060=1&format=sitefile_output&group_key=huc_cd&sitefile_output_format=xml&column_name=agency_cd&column_name=site_no&column_name=station_nm&range_selection=days&period=7&begin_date=2022-04-07&end_date=2022-04-14&date_format=YYYY-MM-DD&rdb_compression=file&list_of_search_criteria=huc2_cd%2Csite_tp_cd%2Crealtime_parameter_selection&column_name=site_tp_cd&column_name=dec_lat_va&column_name=dec_long_va&column_name=agency_use_cd USGS NWIS: Map View - Colorado River Basin]====
	This interactive map is similar to the ~~USGS Water Watch map~~ but shows both the ~530 active gages (dark gray) and the ~380 inactive gages (light gray) across the basin for which daily streamflow over some period has been archived in the USGS National Water Information System. Click on a gage to get see the name; click "Access data" to go to the (old-USGS-style) ~~data page for that gage.~~		This interactive map is similar to the above two but shows both the ~530 active gages (dark gray) and the ~380 inactive gages (light gray) across the basin for which daily streamflow over some period has been archived in the USGS National Water Information System. Click on a gage to get see the name; click "Access data" to go to the (old-USGS-style) data page for that gage.

	~~====[https://dashboard.waterdata.usgs.gov/app/nwd/en/?aoi=default USGS National Water Dashboard]====~~
	This interactive map that is similar to the above two, in that the default view shows active USGS gages and current streamflow. The unique feature of this tool is that additional layers with USGS station data and other hydroclimatic data can be shown on the map, including groundwater, water quality, current weather radar, and recent precipitation. Mouse-over a gage to see a popup with its name and the data for the selected layer; click on that gage to open the real-time data page for that gage.

	====[https://www.usbr.gov/lc/region/g4000/riverops/BcooDataExplorer.html Reclamation Boulder Canyon Operations Office (BCOO) - Data Explorer]====		====[https://www.usbr.gov/lc/region/g4000/riverops/BcooDataExplorer.html Reclamation Boulder Canyon Operations Office (BCOO) - Data Explorer]====

JeffreyJLukas: /* Data and tools */

2024-01-18T23:51:50Z

Data and tools

← Older revision		Revision as of 19:51, 18 January 2024
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	====[https://dashboard.waterdata.usgs.gov/app/nwd/en/?aoi=default USGS National Water Dashboard]====		====[https://dashboard.waterdata.usgs.gov/app/nwd/en/?aoi=default USGS National Water Dashboard]====
	This interactive map that is similar to the above two, in that the default view shows active USGS gages and current streamflow. The unique feature of this tool is that additional layers with USGS station data and other hydroclimatic data can be shown on the map, including groundwater, water quality, current weather radar, and recent precipitation.		This interactive map that is similar to the above two, in that the default view shows active USGS gages and current streamflow. The unique feature of this tool is that additional layers with USGS station data and other hydroclimatic data can be shown on the map, including groundwater, water quality, current weather radar, and recent precipitation. Mouse-over a gage to see a popup with its name and the data for the selected layer; click on that gage to open the real-time data page for that gage.

	====[https://www.usbr.gov/lc/region/g4000/riverops/BcooDataExplorer.html Reclamation Boulder Canyon Operations Office (BCOO) - Data Explorer]====		====[https://www.usbr.gov/lc/region/g4000/riverops/BcooDataExplorer.html Reclamation Boulder Canyon Operations Office (BCOO) - Data Explorer]====

JeffreyJLukas: /* Gaged streamflow - Real-time and Historical */

2024-01-18T23:48:58Z

Gaged streamflow - Real-time and Historical

← Older revision		Revision as of 19:48, 18 January 2024
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	====[https://maps.waterdata.usgs.gov/mapper/nwisquery.html?URL=https://waterdata.usgs.gov/usa/nwis/uv?referred_module=sw&huc2_cd=14&huc2_cd=15&site_tp_cd=ST&site_tp_cd=ST-CA&site_tp_cd=ST-DCH&site_tp_cd=FA-DV&site_tp_cd=FA-OF&index_pmcode_00060=1&format=sitefile_output&group_key=huc_cd&sitefile_output_format=xml&column_name=agency_cd&column_name=site_no&column_name=station_nm&range_selection=days&period=7&begin_date=2022-04-07&end_date=2022-04-14&date_format=YYYY-MM-DD&rdb_compression=file&list_of_search_criteria=huc2_cd%2Csite_tp_cd%2Crealtime_parameter_selection&column_name=site_tp_cd&column_name=dec_lat_va&column_name=dec_long_va&column_name=agency_use_cd USGS NWIS: Map View - Colorado River Basin]====		====[https://maps.waterdata.usgs.gov/mapper/nwisquery.html?URL=https://waterdata.usgs.gov/usa/nwis/uv?referred_module=sw&huc2_cd=14&huc2_cd=15&site_tp_cd=ST&site_tp_cd=ST-CA&site_tp_cd=ST-DCH&site_tp_cd=FA-DV&site_tp_cd=FA-OF&index_pmcode_00060=1&format=sitefile_output&group_key=huc_cd&sitefile_output_format=xml&column_name=agency_cd&column_name=site_no&column_name=station_nm&range_selection=days&period=7&begin_date=2022-04-07&end_date=2022-04-14&date_format=YYYY-MM-DD&rdb_compression=file&list_of_search_criteria=huc2_cd%2Csite_tp_cd%2Crealtime_parameter_selection&column_name=site_tp_cd&column_name=dec_lat_va&column_name=dec_long_va&column_name=agency_use_cd USGS NWIS: Map View - Colorado River Basin]====
	This interactive map is similar to the USGS Water Watch map but shows both the ~530 active gages (dark gray) and the ~380 inactive gages (light gray) across the basin for which daily streamflow over some period has been archived in the USGS National Water Information System. Click on a gage to get see the name; click "Access data" to go to the (old-USGS-style) data page for that gage.		This interactive map is similar to the USGS Water Watch map but shows both the ~530 active gages (dark gray) and the ~380 inactive gages (light gray) across the basin for which daily streamflow over some period has been archived in the USGS National Water Information System. Click on a gage to get see the name; click "Access data" to go to the (old-USGS-style) data page for that gage.

			====[https://dashboard.waterdata.usgs.gov/app/nwd/en/?aoi=default USGS National Water Dashboard]====
			This interactive map that is similar to the above two, in that the default view shows active USGS gages and current streamflow. The unique feature of this tool is that additional layers with USGS station data and other hydroclimatic data can be shown on the map, including groundwater, water quality, current weather radar, and recent precipitation.

	====[https://www.usbr.gov/lc/region/g4000/riverops/BcooDataExplorer.html Reclamation Boulder Canyon Operations Office (BCOO) - Data Explorer]====		====[https://www.usbr.gov/lc/region/g4000/riverops/BcooDataExplorer.html Reclamation Boulder Canyon Operations Office (BCOO) - Data Explorer]====

JeffreyJLukas at 16:33, 17 January 2024

2024-01-17T16:33:53Z

← Older revision		Revision as of 12:33, 17 January 2024
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	==Overview==		==Overview==
	[[File:Lees_Ferry_gage_past-now.png\|thumb\|600px\|Figure 1. ~~Perhaps the~~ most important stream gage in the basin: ~~The~~ Colorado River at Lees Ferry, AZ (USGS ID [https://waterdata.usgs.gov/monitoring-location/09380000 09380000]). At left is the ~25-foot-tall gage house, built in 1921, as seen from the opposite bank in September 1923; at right is a similar, present-day view of the gage house. Source: Left: Topping, Schmidt, and Vierra (2003), https://doi.org/10.3133/pp1677; Right: USGS Arizona Science Centers.]]		[[File:Lees_Ferry_gage_past-now.png\|thumb\|600px\|Figure 1. The most important stream gage in the basin: Colorado River at Lees Ferry, AZ (USGS ID [https://waterdata.usgs.gov/monitoring-location/09380000 09380000]). At left is the ~25-foot-tall gage house, built in 1921, as seen from the opposite bank in September 1923; at right is a similar, present-day view of the gage house. Source: Left: Topping, Schmidt, and Vierra (2003), https://doi.org/10.3133/pp1677; Right: USGS Arizona Science Centers.]]

	====Streamflow observations====		====Streamflow observations====

JeffreyJLukas: /* Adjusted streamflow - NRCS */

2023-11-24T23:48:38Z

Adjusted streamflow - NRCS

← Older revision		Revision as of 19:48, 24 November 2023
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	===Adjusted streamflow - NRCS===		===Adjusted streamflow - NRCS===

	====[https://nwcc-apps.sc.egov.usda.gov/imap/#version=~~158~~&elements=&networks=!&states=!&counties=!&hucs=&minElevation=&maxElevation=&elementSelectType=any&activeOnly=true&activeForecastPointsOnly=false&hucLabels=false&hucIdLabels=false&hucParameterLabels=true&stationLabels=&overlays=&hucOverlays=2&basinOpacity=75&basinNoDataOpacity=25&basemapOpacity=100&maskOpacity=0&mode=data&openSections=dataElement,parameter,date,basin,options,elements,location,networks,&controlsOpen=true&popup=&popupMulti=&popupBasin=&base=esriNgwm&displayType=station&basinType=6&dataElement=SRVO&depth=-8&parameter=PCTPORAVG&frequency=MONTHLY&duration=wytd&customDuration=&dayPart=E~~&year=2022&month=3&day=20~~&monthPart=E~~&forecastPubMonth=1~~&forecastPubDay=1&forecastExceedance=50&seqColor=1&divColor=7&scaleType=D&scaleMin=&scaleMax=&referencePeriodType=POR&referenceBegin=1991&referenceEnd=2020&minimumYears=20&hucAssociations=true&lat=36.986&lon=-104.854&zoom=6.0 NRCS Interactive Map - Observed Streamflow Volume]====		====[https://nwcc-apps.sc.egov.usda.gov/imap/#version=169&elements=&networks=!&states=!&counties=!&hucs=&minElevation=&maxElevation=&elementSelectType=any&activeOnly=true&activeForecastPointsOnly=false&hucLabels=false&hucIdLabels=false&hucParameterLabels=true&stationLabels=&overlays=&hucOverlays=2&basinOpacity=75&basinNoDataOpacity=25&basemapOpacity=100&maskOpacity=0&mode=data&openSections=dataElement,parameter,date,basin,options,elements,location,networks&controlsOpen=true&popup=&popupMulti=&popupBasin=&base=esriNgwm&displayType=station&basinType=6&dataElement=SRVO&depth=-8&parameter=PCTPORAVG&frequency=MONTHLY&duration=wytd&customDuration=&dayPart=E&monthPart=E&forecastPubDay=1&forecastExceedance=50&useMixedPast=true&seqColor=1&divColor=7&scaleType=D&scaleMin=&scaleMax=&referencePeriodType=POR&referenceBegin=1991&referenceEnd=2020&minimumYears=20&hucAssociations=true&relativeDate=-1&lat=36.986&lon=-104.854&zoom=6.0 NRCS Interactive Map - Observed Streamflow Volume]====
	This link shows the NRCS Interactive Map customized to show the adjusted streamflow for the current water-year-to-date, as a % of the period-of-record average. Click on a gage of interest to bring up a popup, click on the popup to expand it, and then click on Data Reports and either Water Year Table or Water Year Chart for the current year's monthly flows. For historical flows at that gage, open the Water Year Table, click on the Create/Modify Report tab in the upper left. When the tab opens, click the first checkbox for 'stream volume, adjusted' then below that, change Time Period to "Period of Record", then click on the View Report tab at upper left.		This link shows the NRCS Interactive Map customized to show the adjusted streamflow for the current water-year-to-date, as a % of the period-of-record average. Click on a gage of interest to bring up a popup, click on the popup to expand it, and then click on Data Reports and either Water Year Table or Water Year Chart for the current year's monthly flows. For historical flows at that gage, open the Water Year Table, click on the Create/Modify Report tab in the upper left. When the tab opens, click the first checkbox for 'stream volume, adjusted' then below that, change Time Period to "Period of Record", then click on the View Report tab at upper left.

JeffreyJLukas: /* Adjusted streamflow - NRCS */

2023-11-24T23:47:38Z

Adjusted streamflow - NRCS

← Older revision		Revision as of 19:47, 24 November 2023
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	===Adjusted streamflow - NRCS===		===Adjusted streamflow - NRCS===

	====[https://~~www~~.~~nrcs~~.usda.gov/~~wps/portal/wcc/home/quicklinks~~/#version=158&elements=&networks=!&states=!&counties=!&hucs=&minElevation=&maxElevation=&elementSelectType=any&activeOnly=true&activeForecastPointsOnly=false&hucLabels=false&hucIdLabels=false&hucParameterLabels=true&stationLabels=&overlays=&hucOverlays=2&basinOpacity=75&basinNoDataOpacity=25&basemapOpacity=100&maskOpacity=0&mode=data&openSections=dataElement,parameter,date,basin,options,elements,location,networks,&controlsOpen=true&popup=&popupMulti=&popupBasin=&base=esriNgwm&displayType=station&basinType=6&dataElement=SRVO&depth=-8&parameter=PCTPORAVG&frequency=MONTHLY&duration=wytd&customDuration=&dayPart=E&year=2022&month=3&day=20&monthPart=E&forecastPubMonth=1&forecastPubDay=1&forecastExceedance=50&seqColor=1&divColor=7&scaleType=D&scaleMin=&scaleMax=&referencePeriodType=POR&referenceBegin=1991&referenceEnd=2020&minimumYears=20&hucAssociations=true&lat=36.986&lon=-104.854&zoom=6.0 NRCS Interactive Map - Observed Streamflow Volume]====		====[https://nwcc-apps.sc.egov.usda.gov/imap/#version=158&elements=&networks=!&states=!&counties=!&hucs=&minElevation=&maxElevation=&elementSelectType=any&activeOnly=true&activeForecastPointsOnly=false&hucLabels=false&hucIdLabels=false&hucParameterLabels=true&stationLabels=&overlays=&hucOverlays=2&basinOpacity=75&basinNoDataOpacity=25&basemapOpacity=100&maskOpacity=0&mode=data&openSections=dataElement,parameter,date,basin,options,elements,location,networks,&controlsOpen=true&popup=&popupMulti=&popupBasin=&base=esriNgwm&displayType=station&basinType=6&dataElement=SRVO&depth=-8&parameter=PCTPORAVG&frequency=MONTHLY&duration=wytd&customDuration=&dayPart=E&year=2022&month=3&day=20&monthPart=E&forecastPubMonth=1&forecastPubDay=1&forecastExceedance=50&seqColor=1&divColor=7&scaleType=D&scaleMin=&scaleMax=&referencePeriodType=POR&referenceBegin=1991&referenceEnd=2020&minimumYears=20&hucAssociations=true&lat=36.986&lon=-104.854&zoom=6.0 NRCS Interactive Map - Observed Streamflow Volume]====
	This link shows the NRCS Interactive Map customized to show the adjusted streamflow for the current water-year-to-date, as a % of the period-of-record average. Click on a gage of interest to bring up a popup, click on the popup to expand it, and then click on Data Reports and either Water Year Table or Water Year Chart for the current year's monthly flows. For historical flows at that gage, open the Water Year Table, click on the Create/Modify Report tab in the upper left. When the tab opens, click the first checkbox for 'stream volume, adjusted' then below that, change Time Period to "Period of Record", then click on the View Report tab at upper left.		This link shows the NRCS Interactive Map customized to show the adjusted streamflow for the current water-year-to-date, as a % of the period-of-record average. Click on a gage of interest to bring up a popup, click on the popup to expand it, and then click on Data Reports and either Water Year Table or Water Year Chart for the current year's monthly flows. For historical flows at that gage, open the Water Year Table, click on the Create/Modify Report tab in the upper left. When the tab opens, click the first checkbox for 'stream volume, adjusted' then below that, change Time Period to "Period of Record", then click on the View Report tab at upper left.

JeffreyJLukas at 20:37, 18 October 2023

2023-10-18T20:37:11Z

← Older revision		Revision as of 16:37, 18 October 2023
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	====Streamflow observations====		====Streamflow observations====
			Observed streamflows are critical to nearly all aspects of policy and management of the basin's water supply. Real-time gaged streamflows are used directly in streamflow forecasting, flood warning systems, reservoir operations, diversion scheduling, recreation management, and ecosystem management. Historical streamflow observations, often after some modification to correct for upstream uses, are used to depict hydrologic variability and trends, in support of both planning and management.

	Streamflow gages were first installed in the basin in the late 1800s (Figure 1). The primary stream-gage network is the over 500 active gages operated and maintained by USGS and its federal, state, and local partners through the Cooperative Water Program. USGS performs quality control and is the central clearinghouse for online streamflow data, though several partners provide streamflow data through their own websites. State and local water agencies also operate and maintain their own gages, typically on diversion structures and at reservoirs.		Streamflow gages were first installed in the basin in the late 1800s (Figure 1). The primary stream-gage network is the over 500 active gages operated and maintained by USGS and its federal, state, and local partners through the Cooperative Water Program. USGS performs quality control and is the central clearinghouse for online streamflow data, though several partners provide streamflow data through their own websites. State and local water agencies also operate and maintain their own gages, typically on diversion structures and at reservoirs.

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	====Modeled streamflows====		====Modeled streamflows====
	Because of the relatively high density of streamflow observations (i.e., stream gages) available in real-time and as historical records, ''modeled'' streamflows are not as prevalent or important for water-supply monitoring as modeled [[soil moisture]] values or modeled [[snowpack]] values. But modeled streamflows--typically generated by a hydrologic model or land-surface model (LSM)--do have a key role in some applications.		Because of the relatively high density of streamflow observations (i.e., stream gages) available in real-time and as historical records, ''modeled'' streamflows are not as prevalent or important for water-supply monitoring as modeled [[soil moisture]] values or modeled [[snowpack]] values. But modeled streamflows--typically generated by a hydrologic model or land-surface model (LSM)--do have a key role in some applications. Modeled streamflows are inherent to the streamflow forecasting process (e.g., [[seasonal streamflow forecasts]]); the forecast model must accurately reproduce historic observed streamflows (i.e., calibration) as a precondition for forecasting. Modeled flows are also developed for real-time and historical applications in catchments or stream reaches where there are no gages, or to represent historical periods before gages were installed.

	~~==Relevance==~~
	[[File:USGS_Water_Watch.png\|thumb\|400px\|Figure 2. Active stream gages in the Colorado River Basin, highlighting those that were in drought conditions for April 2022 (monthly gaged flow <25th percentile). Source: USGS [https://waterwatch.usgs.gov/index.php?mt=mv01d_dry&st=h14%2Ch15&usst=&ushuc=&xorms=ms&mcf=region&go=GO&id=wwlmap_viewer Water Watch interactive map].)]]		[[File:USGS_Water_Watch.png\|thumb\|400px\|Figure 2. Active stream gages in the Colorado River Basin, highlighting those that were in drought conditions for April 2022 (monthly gaged flow <25th percentile). Source: USGS [https://waterwatch.usgs.gov/index.php?mt=mv01d_dry&st=h14%2Ch15&usst=&ushuc=&xorms=ms&mcf=region&go=GO&id=wwlmap_viewer Water Watch interactive map].)]]
	Observed streamflows are critical to nearly all aspects of policy and management of the basin's water supply. Real-time gaged streamflows are used directly in streamflow forecasting, flood warning systems, reservoir operations, diversion scheduling, recreation management, and ecosystem management. Historical streamflow observations, often after some modification to correct for upstream uses, are used to depict hydrologic variability and trends, in support of both planning and management.

	Modeled streamflows are inherent to the streamflow forecasting process (e.g., [[seasonal streamflow forecasts]]); the forecast model must accurately reproduce historic observed streamflows (i.e., calibration) as a precondition for forecasting. Modeled flows are also developed for real-time and historical applications in catchments or stream reaches where there are no gages, or to represent historical periods before gages were installed.

	==Data and tools==		==Data and tools==

JeffreyJLukas at 15:36, 4 August 2022

2022-08-04T15:36:57Z

← Older revision		Revision as of 11:36, 4 August 2022
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	==Overview==		==Overview==
	[[File:Lees_Ferry_gage_past-now.png\|thumb\|600px\|Figure 1. Perhaps the most important stream gage in the basin: ~~the~~ Colorado River at Lees Ferry, AZ (USGS ID [https://waterdata.usgs.gov/monitoring-location/09380000 09380000]). At left is the ~25-foot-tall gage house, built in 1921, as seen from the opposite bank in September 1923; at right is a similar, present-day view of the gage house. Source: Left: Topping, Schmidt, and Vierra (2003), https://doi.org/10.3133/pp1677; Right: USGS Arizona Science Centers.]]		[[File:Lees_Ferry_gage_past-now.png\|thumb\|600px\|Figure 1. Perhaps the most important stream gage in the basin: The Colorado River at Lees Ferry, AZ (USGS ID [https://waterdata.usgs.gov/monitoring-location/09380000 09380000]). At left is the ~25-foot-tall gage house, built in 1921, as seen from the opposite bank in September 1923; at right is a similar, present-day view of the gage house. Source: Left: Topping, Schmidt, and Vierra (2003), https://doi.org/10.3133/pp1677; Right: USGS Arizona Science Centers.]]

	====Streamflow observations====		====Streamflow observations====

JeffreyJLukas: /* Data and tools */

2022-05-20T17:56:18Z

Data and tools

← Older revision		Revision as of 13:56, 20 May 2022
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	====[https://www.usbr.gov/lc/region/g4000/NaturalFlow/current.html Reclamation - Current Natural Flow Data]====		====[https://www.usbr.gov/lc/region/g4000/NaturalFlow/current.html Reclamation - Current Natural Flow Data]====
	The Excel file linked on this page contains estimated monthly natural flows for the 20 locations in the Upper Basin, and 9 in the Lower Basin, that are the inflow points for the [[Colorado River Simulation System (CRSS)]]. Most prominent among these is the Colorado River at Lees Ferry. These flow data are updated every year or so by Reclamation to extend the record forward, but they are always 1-2 years behind the most recently completed water year. Provisional data for the Lees Ferry gage only for the most recent water years are found [https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html on this page].		The Excel file linked on this page contains estimated monthly natural flows for the 20 locations in the Upper Basin, and 9 in the Lower Basin, that are the inflow points for the [[Colorado River Simulation System (CRSS)]]. Most prominent among these is the Colorado River at Lees Ferry. These flow data are updated every year or so by Reclamation to extend the record forward, but they are always 1-2 years behind the most recently completed water year. Provisional data for the Lees Ferry gage only for the most recent water years are found [https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html on this page].

	~~=== Modeled streamflow===~~



	</onlyinclude>		</onlyinclude>