The FEMA Web Mapping Service (WMS) is down. The Willow Lake Wastewater Treatment Plant is threatened with flood water above this level. Water data back to 1905 are available online. Water data back to 1909 are available online. Numerous roads and structures in the Salem/Keizer vicinity are flooded. percent full = ( current storage - minimum conservation storage ) / ( maximum conservation storage - minimum conservation storage ) percent above water control diagram = ( current storage - WCD storage . ) or https:// means youve safely connected to the .gov website. Periods with no data are plotted are plotted as grey areas. Lock Data have been checked by the reporting agency. Water data back to 1905 are available online. The middle and lower segments of the Willamette River are geologically stable, whereas the South Santiam and Middle Fork Willamette Rivers were historically dynamic, but are now largely stable in response to flow regulation and revetment construction. Nine of the Willamette Valley dams generate hydroelectricity from the power of water passing through the dams. Share: Share. numerous sloughs are filled, and a few secondary roads begin to flood at this point. Share sensitive information only on official, secure websites. Why aren't the FEMA National Flood Hazard Layers showing on the ESRI Map?Possible reasons: Note: Your zoom level may have changed. DESCRIPTION: Latitude 4416'14", Longitude 12310'21" NAD27 . A .gov website belongs to an official government organization in the Latitude: 45.518333 N, Homes on Browns Island begin flooding at this level. United States. U.S. Geological Survey For details. A .gov website belongs to an official government organization in the NAD83/WGS84, Search by city or zip code. The McKenzie River is a tributary to the Willamette River in northwestern Oregon. Official websites use .gov Percent saturation is estimated as a function of water temperature and Values less than 20,000 ft3/s are estimates only. The Willamette Focused Investment Partnership (WFIP) restoration initiative brings together more than 16 organizations to . Share sensitive information only on official, secure websites. These data are provisional and are subject to revision. ESRI's zoom levels must be between 14 and 16 to show National Flood Hazard layers. The FEMA Web Mapping Service (WMS) is down. PROVISIONAL DATA SUBJECT TO REVISION. If you notice any errors in the below information, please contact our. (2) Promote public instream uses and values in headwaters streams exhibiting high instream values. The results were compared as shown in Figure 1, with daily data measured at the Willamette River at Portland gage station (USGS: 14211720) before it . Lock Clackamette Park at the confluence of the Clackamas and Willamette Rivers is flooded at this and higher stages. The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. If you notice any errors in the below information, please contact our. Also expect flooding of the shopping district and other businesses along the Willamette River in Oregon City adjacent to I-205. DESCRIPTION: Latitude 4517'57", Longitude 12245'00" NAD27 Clackamas County, Oregon, Hydrologic Unit 17090007 Drainage area: 8,400 square miles AVAILABLE DATA: Data Type Begin Date End Date Count; Daily Data: Discharge, cubic feet per second . Willamette River and tributaries to the Willamette River downstream of the following dams: River Mill Dam, Detroit Dam, Foster Dam, Fern Ridge Dam, Cougar Dam, Blue River Dam, Secure .gov websites use HTTPS Monitoring location 14152000 is associated with a STREAM in LANE COUNTY, OREGON. It is still at a level 1 in the Willamette National Forests. expect widespread flooding of lowland agricultural areas and rural and secondary roads. Page Contact Information: Stewart Rounds US Army Corps of Engineers - Portland District. An official website of the United States government. Data have been checked by the reporting agency. Visit https://www.weather.gov/owp/operations for access to new EXPERIMENTAL products and services from the National Water Center: National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook and the National Water Center Visualization Services, a suite of geospatial services depicting River Forecast Center and National Water Model information. Why aren't the FEMA National Flood Hazard Layers showing on the ESRI Map?Possible reasons: Note: Your zoom level may have changed. A lock ( Water data back to 1992 are available online. Water data back to 1861 are available online. U.S. Geological Survey (USGS) Data and Site Info for Portland, 10-day Forecast/Trend, Northwest River Forecast Center, Lewis Dams - USGS data (scroll down to Lewis basin), Lower Columbia Reservoir and River conditions, USGS River Temperatures & Water Quality Oregon, USGS River Temperatures & Water Quality Washington, Oregon Water Resources Dept - Surface Water Data. US Army Corps of Engineers - Portland District. ) or https:// means youve safely connected to the .gov website. Data are collected every half hour. Show FEMA's National Flood Hazard Layers Zoom Level:15 Flood Impacts & Photos About This Location Latitude: 45.518333 N, Longitude: 122.671111 W, Horizontal Datum: NAD83/WGS84 Current/Historical Observations: U.S. Geological Survey (USGS) Data and Site Info for Portland Additional Information Low Water Alerts are issued for stages below 1.0' access roads to the islands on the Willamette River near Salem begin to flood. Days (365 . Salmon and steelhead will be better treated according to changes the U.S. Army Corps of Engineers is recommending for the 500 trillion gallons of water stored in 13 dams and reservoirs it manages in the Willamette Basin. The Willamette River at Portland site is located at the Morrison Bridge in downtown Portland, OR. minor flooding occurs on Grand Island and other islands in the mid Willamette River. Official websites use .gov Secure .gov websites use HTTPS An official website of the United States government. and are subject to revision. Water data back to 1861 are available online. Data have been checked by the reporting agency. moderate flood stage, expect widespread flooding of low lying areas along the Willamette River from Oregon City to Portland. expect flooding of numerous structures along the Willamette river from Oregon city to the confluence with the Columbia. provided to the NWS by the gauge owner. Data have been checked by the reporting agency. Current conditions of DISCHARGE and GAGE HEIGHT are available. Observation & Prediction (CMOP). Water temperature in the mainstem Willamette River regularly exceeds the standard of 18.0 C (64.4 F) designated for salmon and trout rearing and migration for mid. Longitude: 122.671111 W, An official website of the United States government. expect the river level to reach the top of the lowest point of the downtown Portland sea-wall. Data are downloaded and processed every 3 hours. Willamette River at Newberg, OR - USGS Water Data for the Nation Important Legacy real-time page 7 days 30 days 1 year Willamette River at Newberg, OR February 14, 2023 - February 21, 2023 Feb 15 Feb 16 Feb 17 Feb 18 Feb 19 Feb 20 Feb 21 0.00 0.20 0.40 0.60 0.80 1.00 No data available Value Status Time The Trinity-San Jacinto River Basin is the fifth in a series of at least 10 Integrated Water Science basin studies planned by USGS nationwide. Expect flooding of Oaks Park, along with moorages and industrial areas from Oregon City through downtown Portland into industrial NW Portland. Columbia Park access closure As of July 22, 2020, Deschutes River access is closed due to safety concerns and to prevent further . 3). Official websites use .gov provided to the NWS by the gauge owner. Graph updated: Tumblr. ) or https:// means youve safely connected to the .gov website. Stream Site . Share. 13895 Fir Street. Water data back to 1861 are available online. Current conditions of DISCHARGE, GAGE HEIGHT, MEAN WATER VELOCITY FOR DISCHARGE COMPUTATION, and MORE are available. The Willamette River also backs up water from tributary streams and creeks, which in turn produces flooding of residential neighborhoods along these creeks in Salem and Keizer. Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps, Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps, Older USGS topographic maps, NGVD29 benchmarks, Older USGS topographic maps, MSL benchmarks. A lock ( Call the Canby Ferry Information Line for status updates at 503-650-3030. Periods with no data are plotted are plotted as grey areas. Share sensitive information only on official, secure websites. For details. Portland/Metro Oregon Fishing Report - Reports of more robust catches of spring Chinook are coming from Willamette River anglers. View the Enhanced Operating Capability Products and Services StoryMap here. Excludes the . is the approximate location based on the latitude/longitude coordinates USGS personnel conducted four dye studies to determine travel time in selected river reaches of the Willamette and Long Tom Rivers. Engineering Phone: 971-204-4601. The USGS is exploring how rearing habitat for spring-run Chinook salmon and winter steelhead trout varies with the amount of water in the Willamette River. United States. WILLAMETTE RIVER AT PORTLAND, OR Important Legacy real-time page Monitoring location 14211720 is associated with a TIDAL STREAM in MULTNOMAH COUNTY, OREGON. The Willamette River Basin is the largest watershed in the state, covering more than 11,500 square miles. WILLAMETTE RIVER BELOW FALLS, AT OREGON CITY, OR. Latitude: 45.357900 N, Dye studies provide important information on the time of travel in the studied reaches. 7 days 30 days 1 year Change time span expect flooding of numerous roads along the Willamette in the Salem area. WILSON RIVER NEAR TILLAMOOK, OR. Turbidity data are measured in FNU units. Project numbers: percent full / percent above WCD, where. United States. The area of focus encompasses the main stem Willamette River above Newberg and the portions of the Coast Fork Willamette, Middle Fork Willamette, McKenzie, and North, South and main stem Santiam Rivers downstream of U.S. Army Corps of Engineers dams. Locked padlock Keizer begins to flood. Official websites use .gov Flooding of some portions of Waterfront Park is possible at this and higher stages. The study site is located within the Willamette River watershed (Oregon, United States), which includes free-flowing river segments and a reservoir downstream of the mine. Oregon City, OR 97045. Available data for this site Stream Site. US Army Corps of Engineers - Portland District. Willamette River Report 155960.73 ACRE-FT +4080.0 cfs (+5.47%) today 84.73% of Normal 6 Streamgages Total streamflow across the Willamette River was last observed at 78630 cfs, and is expected to yield approximately 155961 acre-ft of water today; about 85% of normal. A .gov website belongs to an official government organization in the Saturday - Mar 4, 2023 at 13:59:08 EST, Graph updated: There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. Water data back to 1861 are available online. Visit https://www.weather.gov/owp/operations for access to new EXPERIMENTAL products and services from the National Water Center: National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook and the National Water Center Visualization Services, a suite of geospatial services depicting River Forecast Center and National Water Model information. There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. Show FEMA's National Flood Hazard Layers Zoom Level:16 Flood Impacts & Photos About This Location Latitude: 44.944167 N, Longitude: 123.042500 W, Horizontal Datum: NAD83/WGS84 Current/Historical Observations: U.S. Geological Survey (USGS) Data and Site Info for Salem Additional Information 10-day Forecast/Trend, Northwest River Forecast Center Periods with no data Graph updated: Tuesday, 28-Feb-2023 19:59:03 EST Locked padlock The river is about 90 miles long and drains an area of about 1,300 square miles. Privacy Explore the NEW USGS National Water Dashboard interactive map to access real-time water data from over 13,500 stations nationwide. Data are collected every half hour. E-mail : ocpublicworks@orcity.org. are plotted as grey areas. Horizontal Datum: 14-Days of Turbidity at the Willamette River at Portland, OR (14211720) Data are downloaded and processed every 3 hours. ) or https:// means youve safely connected to the .gov website. expect widespread flooding. Latitude/Longitude Disclaimer: The gauge location shown in the above map UPPER WILLAMETTE RIVER BASIN: 14144800: MIDDLE FORK WILLAMETTE RIVER NR OAKRIDGE, OR : 03/03 05:50 PST : 8.84 -- -- --- 14144900: HILLS CR AB HILLS CR RES, NR OAKRIDGE, OR expect minor flooding of localized areas along the lower willamette. There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. WILLAMETTE RIVER AT HARRISBURG, OR Important Legacy real-time page Monitoring location 14166000 is associated with a STREAM in LINN COUNTY, OREGON. Current conditions of DISCHARGE, GAGE HEIGHT, and TEMPERATURE are available. Pin it. Data in the graph are plotted against the axis of the same color. Official websites use .gov Use of bait allowed April 22 - Oct. 31 but beginning Nov. 1 anglers may only use lures and artificial flies. flooding begins in low lying areas along the Willamette River from Oregon City downstream to Lake Oswego. Current conditions of DISCHARGE, GAGE HEIGHT, and TEMPERATURE are available. Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps, Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps, Older USGS topographic maps, NGVD29 benchmarks, Older USGS topographic maps, MSL benchmarks. The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. These data are provisional and are subject to revision. The river is open to fishing all year for trout, hatchery Chinook salmon, hatchery steelhead, and wild steelhead over 24 inches. Graph updated: Current conditions of DISCHARGE and GAGE HEIGHT are available. Monitoring location 14191000 is associated with a STREAM in MARION COUNTY, OREGON. 7 days 30 days 1 year Change time span Retrieve data Saturday, 04-Mar-2023 13:59:15 EST, Graph updated: Water data back to 1894 are available online. Expect widespread flooding of lowland areas, parks, roads and a few structures along the Willamette River from Oregon City to Portland. NAD83/WGS84, Search by city or zip code. Show FEMA's National Flood Hazard Layers Zoom Level:15 Flood Impacts & Photos About This Location Latitude: 44.566389 N, Longitude: 123.256944 W, Horizontal Datum: NAD83/WGS84 Current/Historical Observations: U.S. Geological Survey (USGS) Data and Site Info for Corvallis Additional Information Datum was changed by 10 FEET in 2010. downtown Portland, OR. Data are collected every half hour. These data are provisional Two dye studies were conducted on each of these rivers; one at high flow in the spring, and one at low flow in late summer. expect flooding of Front Street near the Burnside Bridge. Zoom to a region of interest and hover over any dot to generate a hydrograph of recently observed water levels at that site. Locked padlock The Willamette River at Portland site is located at the Morrison Bridge in downtown Portland, OR. Reference Frame. islands on the Willamette River between Oregon City and downtown Portland begin to flood. major flooding of homes and industrial areas in Gladstone and West Linn has historically occurred at this and higher stages. The Willamette River is a 187-mile (301 km) tributary of the Columbia River in the U.S. state of Oregon.The upper tributaries of the Willamette originate in mountains south and southeast of the twin cities of Eugene and Springfield.Formed by the confluence of the Middle Fork Willamette River and Coast Fork Willamette River near Springfield, the main stem meanders generally north from source to . ESRI's zoom levels must be between 14 and 16 to show National Flood Hazard layers. A .gov website belongs to an official government organization in the Secure .gov websites use HTTPS The riverbed is approximately 450 feet above sea level at the southern end of the valley and ten feet above sea level at its confluence with the Columbia River. A lock ( Data have been checked by the reporting agency. Table 1. Available data for this site . Numerous secondary roads begin flooding at this point. 187 surface area (mi) 11478 max. NWS River Observations and Forecasts A color-coded map indicates current river levels or flood stages for more than 6,500 streamgages in U.S. states and territories. The Willamette River Basin is approximately 180 miles in length and roughly 100 miles wide. Page Last Modified: Monday - Feb 5, 2018 at 18:37:14 EST, Center for Coastal Margin FEMA's National Flood Hazard Layers not showing? Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps, Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps, Older USGS topographic maps, NGVD29 benchmarks, Older USGS topographic maps, MSL benchmarks, Low Water Alerts are issued for stages below 1.0'. Discharge Values less than 20,000 ft 3 /s are estimates only. Press enter or select the go button to submit request, Chance of Exceeding Levels During Entire Period, Short-term Probabilistic Guidance (Experimental), U.S. Geological Survey (USGS) Data and Site Info for Salem, 10-day Forecast/Trend, Northwest River Forecast Center, Lewis Dams - USGS data (scroll down to Lewis basin), Lower Columbia Reservoir and River conditions, USGS River Temperatures & Water Quality Oregon, USGS River Temperatures & Water Quality Washington, Oregon Water Resources Dept - Surface Water Data. Access roads to these islands are also likely flooded at this point. An official website of the United States government. The USGS has collected and compiled groundwater data for the Willamette River Basin, Oregon. FEMA's National Flood Hazard Layers not showing? Explore the NEW USGS National Water Dashboard interactive map to access real-time water data from over 13,500 stations nationwide. Data are downloaded and processed every 3 hours. based on turbidity data and are measured in feet. Secure .gov websites use HTTPS Draining an area of over 11,200 square miles, the river supplied water for agricultural, industrial, municipal, and domestic uses in the Willamette Valley. Graph updated: About This Location. provided to the NWS by the gauge owner. USGS 14158000 WILLAMETTE RIVER AT SPRINGFIELD, OREG. A lock ( For more information on your flood risk go to www.floodsmart.gov. DESCRIPTION: Latitude 4438'20", Longitude 12306'20" NAD27 . The objectives of the Commission in managing the waters of Willamette Basin are to: (1) Retain minimum perennial streamflows as provided in OAR 690-502-0050 to 690-502-0150 until the process for conversion to instream water rights is completed. Latitude: 44.944167 N, 7 days 30 days 1 year Change time span Retrieve data City of Portland - Bureau of Environmental Services, US Army Corps of Engineers - Portland District, USGS - National Water Quality Monitoring Network. Press enter or select the go button to submit request. The ferry is open daily from 9 a.m. to 6 p.m., except on holidays* and when the river level is at 70 feet or higher. expect localized flooding in the Northwest Portland industrial area. Since 2008, large-scale restoration programs have been implemented along the Willamette River, Oregon, to address historical losses of floodplain habitats caused by dam construction, bank protection, large wood removal, land conversion, and other anthropogenic influences. Created: Wed Mar 1 05:10:31 2023. Current Water Level: Source. The Willamette River, in its natural state, was always subject to annual flooding. WILLAMETTE RIVER AT NEWBERG, OR Important Legacy real-time page Monitoring location 14197900 is associated with a STREAM in YAMHILL COUNTY, OREGON. Monitoring location 14166000 is associated with a STREAM in LINN COUNTY, OREGON. Share sensitive information only on official, secure websites. expect flooding of some low spots of trails along the west and east banks of the Willamette in and near downtown Portland. Secure .gov websites use HTTPS Tweet. ) or https:// means youve safely connected to the .gov website. Willamette River nautical chart and water depth map Willamette River nautical chart The marine chart shows depth and hydrology of Willamette River on the map. WILLAMETTE RIVER AT CORVALLIS, OR Important Legacy real-time page Monitoring location 14171600 is associated with a STREAM in BENTON COUNTY, OREGON. The Willamette River Basin is the fourth in a series of at least ten Integrated Water Science basin studies planned by USGS nationwide. Data Type Begin Date End Date Count Current / Historical Observations (availability statement) : 1986-10-01 : 2023-03-03 : Daily Data: Temperature, water, degrees Celsius : 1960-10-01 At 12 feet (3.7 m) above flood stage, the flooding of the Willamette River at Portland in 1964 was second only to the 1948 flood that wiped out Vanport City. Secure .gov websites use HTTPS 7 days 30 days 1 year Change time span Retrieve data We've compiled the most frequently used Oregon river levels using active gauges and dropped them on this one page so you can quickly access information about the Oregon rivers you fish or navigate. is the approximate location based on the latitude/longitude coordinates Operations Phone: 971-204-4600. Secchi depth data are estimated Saturday - Mar 4, 2023 at 13:59:12 EST, Graph updated: Explore the NEW USGS National Water Dashboard interactive map to access real-time water data from over 13,500 stations nationwide. Stream Site. Also expect major widespread flooding from Santiam confluence to Oregon City. barometric pressure at this site. A lock ( DESCRIPTION: Latitude 4520'25", Longitude 12238'15" NAD27 Clackamas County, Oregon, Hydrologic Unit . The Willamette River drains approximately 11,500 square miles (mi 2) of northwestern Oregon between the Coast Range and the Cascade Range, flowing for 187 miles (mi) from its start at the confluence of the Middle and Coast Forks of the Willamette River, south of Eugene, to its confluence with the Columbia River near Portland ( fig. The other four basins selected to date are the Upper Colorado, Delaware, Illinois and Willamette River Basins. Data have been checked by the reporting agency. Lock A .gov website belongs to an official government organization in the Currently, in the entire Willamette River Basin there are 69 species of fish36 native species and 33 non-natives. An official website of the United States government. water level above NAVD 1988, feet Dis-charge, ft3/s Long-term median flow 3/3 MALHEUR AND HARNEY LAKES BASIN: 10396000: DONNER UND BLITZEN RIVER NR FRENCHGLEN OR . NOTE: Gauge reading affected by ocean tides. USGS 14198000 WILLAMETTE RIVER AT WILSONVILLE, OREG. Monitoring location 14174000 is associated with a STREAM in LINN COUNTY, OREGON. For details. 7 days 30 days 1 year Change time span Retrieve data Gage height, ft NEHALEM RIVER NEAR FOSS, OR. Eight of these facilities are owned and operated by the Corps of Engineers, and. Saturday - Mar 4, 2023 at 13:59:13 EST, Graph updated: A .gov website belongs to an official government organization in the WILLAMETTE RIVER AT SALEM, OR Important Legacy real-time page Monitoring location 14191000 is associated with a STREAM in MARION COUNTY, OREGON. A lock ( 7 days 30 days 1 year Change time span Retrieve data Gage height, ft Lock Data are collected every half hour. Current conditions of DISCHARGE and GAGE HEIGHT are available. Available data for this site Stream Site. Press enter or select the go button to submit request, U.S. Geological Survey (USGS) Data and Site Info for Falls at Oregon City, Historical Data at USACE DataQuery (enter ORCO in search window), 10-day Forecast/Trend, Northwest River Forecast Center, Lewis Dams - USGS data (scroll down to Lewis basin), Lower Columbia Reservoir and River conditions, USGS River Temperatures & Water Quality Oregon, USGS River Temperatures & Water Quality Washington, Oregon Water Resources Dept - Surface Water Data. Current Water Level: Source. Available Parameters Period of Record; All 1 Available Parameters for this site : 00060 Discharge(Mean) 1911-10-01 : 1957-09-29: Output format Graph Graph w/ stats Graph w/ (up to 3) parms Table Tab-separated. Current conditions of GAGE HEIGHT are available. After all, to simulate temperature in the Willamette River, one must first know how much water is in the system, and the surface area through which heat is exchanged between the river and the atmosphere. Portland North-West: Sellwood Bridge - Willamette River Live Webcam & Weather Report in Portland, Oregon, United States - See WorldWide Live Stream and Still Timelapse WebCams by See.Cam The Willamette River at Portland site is located at the Morrison Bridge in downtown Portland, OR. Horizontal Datum: Public Works. Visit https://www.weather.gov/owp/operations for access to new EXPERIMENTAL products and services from the National Water Center: National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook and the National Water Center Visualization Services, a suite of geospatial services depicting River Forecast Center and National Water Model information. Current conditions of DISCHARGE and GAGE HEIGHT are available. major flood stage, numerous homes are threatened with flooding in the vicinity of West Linn and Marylhurst along River St, and also in the Oak Grove area. Full News; USGS 14174000 WILLAMETTE RIVER AT ALBANY, OR. The Willamette River stretches nearly 300 miles from its headwaters at Waldo Lake near Eugene to the confluence with the Columbia River in North Portland. An official website of the United States government. FEMA's National Flood Hazard Layers not showing? [3] At its peak, the water was at the top of Downtown Portland's seawall. Willamette. Approach Bathymetric data form the basis of a model's representation of the river channel. WCD: Water Control Diagram. Based on fish surveys completed from 1998 to 2018 by Oregon State University and records from the Oregon State University Ichthyology Collection, the Willamette River Basin has 34 native fish species found upstream of Current conditions of DISCHARGE, GAGE HEIGHT, and TEMPERATURE are available. Ferry Hours and Status. MIDDLE FORK WILLAMETTE RIVER AT JASPER, OR Important Legacy real-time page Monitoring location 14152000 is associated with a STREAM in LANE COUNTY, OREGON. Call for trip availability or in stock goods (503) 265-8060 . Lock numerous roads and structures are flooded. Current Water Level: Source. ACOE correlations to estimate flow at Willamette River at Portland. For more information on your flood risk go to www.floodsmart.gov. Water data back to 1909 are available online. Water data back to 1861 are available online. There are more than a dozen dams on the tributaries to the Willamette River which largely determine streamflows in the mainstem Willamette River throughout the year. The U.S. Geological Survey (USGS) has been monitoring water quality in the Willamette River for many years. United States.
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