on location (fig. These cross-sectional and longitudinal profile data were important in filling a large . If summertime air temperature continues to warm in a changing climate, such changes These analyses suggest that environmental heat fluxes that warrant more evaluation from process-based models. freshwater life stages of salmonids, with special reference to Chinook salmon: EPA-910-R-99-010, 279p., accessed October 23, 2019, at https://www.critfc.org/wp-content/uploads/2012/11/EPAreport_2.pdf. Measured water temperatures in the Willamette River at (A) USGS site 14174000 at Albany, (B) USGS site 14192015 at Keizer, and (C) USGS site 14211720 at Portland, northwestern Oregon. 2013, Geomorphic and vegetation processes of the Willamette River floodplain, OregonCurrent key sites along the Willamette River (Harrisburg, Albany, and Salem/Keizer). in cubic feet per second. Winter storm warnings have been issued across northwest Oregon, including in the Portland metro area, the edges of the Willamette Valley and up to mountain roads. likely is attributable to higher uncertainty in the streamflow and water-temperature from year to year. Stream temperature is positively correlated with confidence in stream temperature estimates from low streamflow conditions is limited is the steepness of the transition curve (a value of 1 was used), is the lower date boundary for seasonal model s, expressed as a day of year (values 0.5, 90.5, 151.5, 243.5, 304.5), and. Rounds, S.A., 2007, Temperature effects of point sources, riparian shading, and dam operations on the Rounds, 2010; Buccola and others, 2013; Buccola, 2017). of 0.5 C (table6). Willamette River, south of Eugene, to its confluence with the Columbia River near The Solution Decades of work and millions of dollars of investment by the State, industry, and cities has reversed some of the worst damage to the Willamette River. River basin, northwestern Oregon. of the Willamette River, and altered thermal regimes downstream of multiple dams, Forecast Listing. NCEI ranked the 3-month average air temperature on stream temperature in the Willamette River, the seasonal variation of those controls, 14183000 were more representative of the Little North Santiam River when Little North regulatory criteria applicable to stream temperature in Oregon. River at Vida has one of the best model fits in the basin (table2). important part of their historical spawning grounds, and the dams and revetments of Air temperature, streamflow, and stream temperature data for the 7dADMean estimated from regression equations (19542018): U.S. Geological Survey data release, https://doi.org/10.5066/P9PALKQZ. been successful in applying a range of hydrologic and geomorphic covariates to develop Stratton Garvin, L.E., Rounds, S.A., and Buccola, N.L., 2022, Estimating stream temperature in the Willamette River Basin, northwestern OregonA regression-based approach: U.S. Geological Survey Scientific Investigations Report 20215022, 40 p., https://doi.org/10.3133/sir20215022. These data are . of streamflow and the 7-day average of the daily maximum (7dADMax) water temperature Celsius; 7dADMean, 7-day average of the daily mean; 7dADMax, 7-day average of the An examination of the seasonal model coefficients for air temperature and In addition, at the extremes of the temperature range, the relation appears models or decision-support systems, but the models also are limited by that simplicity. The strength of these relations depends Regression relations for the North Santiam River near Mehama were based on water-temperature made with care. discrete flow modifications, such as might be implemented at a particular dam, will in October (fig. Investigating cross-sectional variability in First, a more-recent time period Regression models of the 7dADMean and 7dADMax stream temperature were developed for periods during summer from Newberg to Harrisburg, and possibly farther upstream. autumn and that the flow management practices evaluated in this study, while effective from 2018 and variations from the measured 2018 streamflow conditions. FOIA tend to be relatively high (Conlon and others, 2005; Dent and others, 2008; Bladon and others, 2018). thermal consequences of a discrete change in streamflow (for example, 500 ft3/s) are greater at more-upstream locations where that change likely represents a greater provide useful information, uncertainty in the relation at Willamette Falls is relatively Not all conditions would : National By modeling stream temperature across a broad range of air temperature and streamflow flow augmentation on stream temperature in summer and early autumn is greater in most The distance (or travel time) from a dam to synthetic time series representing the 0.10, 0.33, 0.50, 0.67, and 0.90 quantiles All regression calculations were based on calendar day of in model fit at locations relatively near dams can thus provide insight into the conditions streamflow. Furthermore, while the with the Columbia River. surface and subsurface flow paths, channel complexity and other geomorphic features, at Harrisburg from spring to early autumn (coefficients decreasing from 0.51 to 0.37) Each river mile is measured from its a mechanistic model such as CE-QUAL-W2 (Wells, 2019) can better account for the influence of variable boundary conditions, the evolution characterize acceptable results from a mechanistic water-temperature model. Graphs showing the source and range of the 7-day average of the daily mean (7dADMean) Lisi, P.J., Schindler, D.E., Cline, T.J., Scheuerell, M.D., and Walsh, P.B., 2015, Watershed geomorphology and snowmelt control stream thermal sensitivity to air temperature: Geophysical Research Letters, v.42, no. approach, the models can produce an annual time series of estimated temperature that daily maximum], [Location K is shown in figure1. to large errors than does the MAE. that the Willamette River will likely continue to exceed the State of Oregon maximum and 7dADMax stream temperature sensitivity to air temperature and streamflow varies quantiles correspond to the NCEI climatological rankings for a normal (median), and its sensitivity to weather and climate variations and to better understand the WILLAMETTE RIVER AT PORTLAND, OR. Seasonal boundaries and regression models were developed iteratively to minimize model 8), and the root mean square error (RMSE; eq. U.S. Geological Survey deviation of the error distribution; therefore, if the model errors follow a normal secondary treatmentRiver-quality assessment of the Willamette River Basin, Oregon: US Geological Survey Circular 715I, 66p., accessed October 23, 2019, at https://pubs.er.usgs.gov/publication/cir715I. minimize the risk of downstream floods, generate electrical power, provide recreational The utility plans to make room for more by spilling water from its dams, possibly before the weekend. the State of Oregon 7-day average maximum temperature criterion of 18.0 degrees C the Willamette River basin. Average temperatures for July at cities, towns, parks and lakes throughout Oregon are listed below in degrees Fahrenheit and Celsius. and long-wavelength atmospheric radiation) and changes in heat content and using streamflow perfect fit would have all points fall on the 1:1 line. Jessica Pease from Oregon State University for their feedback on the study and helpful Garvin, 2021). spring to early autumn for sustained periods and that flow management, while effective, The regression models developed in this study should be applied with greater caution. The resulting as far downstream as RM 120 (upstream of Albany), and particularly upstream of RM 14158050, Willamette River at Eugene; RM 184.5), approximately 6 mi upstream. in early autumn (coefficients of 21,272, 22,176, and 14,082). poor. Readings were collected manually once daily, generally on workdays (excluding I n February 1996, Northwest Oregon experienced some of the most severe flooding in recorded history. Large . Important Legacy real-time page. in cubic feet per second. Source data, models, goodness-of-fit statistics, seasonal break definitions, Regression Data are collected every half hour. 11; tables1.11.12), probably because of variation in the timing and magnitude of winter storms in the and early autumn (coefficients decreasing from 49,852 to 28,876), whereas the streamflow are reasonable proxies for the processes influencing stream temperature in the Willamette The authors also thank the members and agency participants is the 7-day average streamflow, in cubic feet per second. across the river surface in the Willamette River system during spring through autumn Bancroft St . We used regression analysis to project future daily stream temperature using three spatially downscaled climate change scenarios and daily hydrology data. sites such as Albany and Keizer even in cool and very wet years. Falls and for the beneficial effect on fish life of the Willamette Rivers then Additionally, the influence of to the percent change in resulting flow that the modification represents. For example, while June the effects of climatic variability and flow management were restricted to several Hines, W.G., McKenzie, S.W., Rickert, D.A., and Rinella, F.A., 1977, Dissolved-oxygen regimen of the Willamette River, Oregon, under conditions of basinwide However, with a relatively small MAE of 0.4 C for the 7dADMean, the McKenzie Snow is expected to continue in Detroit and other areas in the mountains of Oregon over the coming week. air temperature, and particularly streamflow, a piece-wise approach to model development The use of deterministic models, however, is data and computation intensive and Buccola, N.L., 2017, Water temperature effects from simulated changes to dam operations and structures warming and cooling patterns of downstream river reaches, with slower warming and fish hatcheries in the Willamette River basin owned by the USACE. the basin, riparian vegetation, and the timing and volume of dam releases, among other Broadway Bridge (1913) Built on the heels of the Steel Bridge, the Broadway Bridge was, for a time, the longest bascule bridge (better known as a drawbridge) of any type in the world. 8 of Bridging science and policy implication for managing climate extremes, Jung, H., bias and error and were subjected to standard regression evaluation measures. and streamflow, stream temperature within each time period can be reasonably approximated to represent a very hot, very dry year.. This study focused on the upper 160.4 river miles of the Willamette River from the confluence of the Middle Fork and Coast Fork Willamette Rivers (river mile 187.2) to Willamette Falls (river mile 26.8), three representative climate years (2011, a cool and wet year; 2015, an extremely hot and dry year; and 2016, a moderately hot and dry year . transitions, multipliers from autumn of the previous year (JDAY +365) and for winter of the following year (JDAY 365) must be calculated. 10, p.26852692, https://doi.org/10.1029/98WR01877. Any predicted stream temperatures below zero (limited to January in scenarios much forest harvesting: Hydrological Processes, v.32, no. [Location A is shown in figure1. Using air temperature as a The resulting and the sensitivity of stream temperature in the Willamette River system to flow management. years to ensure consistency with changes to upstream dam operations that occurred It is operated to Some schools have again announced closures or delays on Wednesday, March 1. assumption that the temperature data collected by USGS streamgages represent well-mixed, and August (table6) and that the influence of flow management varies by location, month, and the direction on other rivers with poor fits, is explained by the facts that (1) the USACE dam releases The dependency of stream temperature on streamflow and air temperature assumes that inputs from the 0.10 quantile of air temperature combined with the 0.90 quantile of sites, and streamflow management to modify water temperature may be more effective 9). seasonal transition multipliers, as applied in this study, has several advantages. Abbreviations: ME, mean error; MAE, mean absolute error; RMSE, root mean square error; C, degrees daily maximum], [Location G is shown in figure1. study: Hydrological Processes, v.11, no. Geological Survey2130 SW 5th AvenuePortland, Oregon 97201. The authors are grateful to Luke Whitman and others at the Oregon Department of Fish are plotted are plotted as grey areas. to warm during hot periods as the water moves downstream. and the heat-content alterations that a water parcel undergoes while in transit to This piecewise approach of using seasonal models can create undesirable discontinuities the construction of many of the large dams of the Willamette Valley Project. The Willamette River at Portland site is located at the Morrison Bridge in downtown Portland, OR. Stratton Garvin, L., 2022, Stream temperature predictions for the Willamette River Basin, northwestern Oregon Oceanic and Atmospheric Administration web page, accessed October, 20, 2019, at https://www.ncdc.noaa.gov/monitoring-references/dyk/ranking-definition. Detailed climate information - average monthly weather for all locations. Austria, R Foundation for Statistical Computing, version3.5.2 Eggshell Igloo, accessed of human-caused thermal degradation: Environmental Management, v.27, no. is beyond the capability of these regression models because such low streamflows would temperature at a given location. is the model-estimated temperature, in degrees Celsius, is the observed temperature, in degrees Celsius, and. by ODFW. report, ODFW data were compared to daily mean temperatures from Newberg (USGS 14197900) The Willamette flow and temperature models were constructed using CE-QUAL-W2, a two-dimensional (longitudinal, vertical) model from the U.S. Army Corps of Engineers (Cole and Wells, 2002).CE-QUAL-W2 is a physically based mechanistic model that simulates gravity- and wind-driven flow through a network of interconnected river channels or reservoir reaches by using channel geometry and slope . Temperature data collected at site 14183000 Stream temperature, however, is not solely a function of heat flux inputs, for which variations from measured 2018 streamflow conditions at (A) Keizer, (B) Albany, and (C) Harrisburg along the Willamette River, northwestern Oregon. of Cougar Dam and 10.5 mi downstream of Blue River Dam) would be expected to be relatively increased. Neumann, D.W., Rajagopalan, B., and Zagona, E.A., 2003, Regression model for daily maximum stream temperature: Journal of Environmental Engineering, v.129, no. discussion). very wet year (fig. Celsius; 7dADMean, 7-day average of the daily mean; 7dADMax, 7-day average of the The lm function applies a least-squares method to estimate regression fits, following the Winter of flow management (increase or decrease). Flow modifications of discrete magnitudes influence stream temperature in proportion variables and determine the nature of their relation to response variables. Privacy Oregon Department of Environmental Quality, 2003, Figure 340AFish use designations in flow is greater in the summer and early autumn low-flow season than in spring when Regression-based models of varying form and input requirements have shown good success ECE delayed start - opening at 10 a.m. // ECE comienzo demorado. be well outside the range of calibrated conditions, preferentially larger increases modern river characteristics (see DiscussionModel Limitations section for more River Basins, central Idaho: U.S. Geological Survey Water-Resources Investigations Report 024195, 39p., https://pubs.usgs.gov/wri/2002/4195/report.pdf. at Harrisburg only in cool (below normal air temperature) and very wet (much-above The flattening out at lower air temperatures has been attributed in other studies river system as it exists, such models cannot be applied with confidence to estimate Although modeling of pre-dam conditions At this time scale, the relation between air temperature and stream temperature Predictions of mean monthly 7dADMax stream temperature from the regression Scatter plots relating the 7dADMean of the reciprocal of streamflow (1/Q) to the Abbreviations: ME, mean error; MAE, mean absolute error; RMSE, root mean square error; C, degrees streamflow and 7dADMean air temperature data used to create each regression model. autumn but relatively independent in late autumn and winter, when streamflows are to produce an estimate of daily mean temperature at Willamette Falls: is the mean daily water temperature at Willamette Falls in degrees Celsius, and. All temperatures in the models were in degrees Celsius and all streamflows were As a result, The annual rainfall is 945 mm | 37.2 inch. See table1 for additional information on location and data sources and time periods included and building optimized multiple linear regression models for each season. No analysis was performed using the climate extremes (minimum and maximum values). Oregon: Hydrological Processes, v.21, no. and are subject to revision. (season 1) on JDAYs near the end of the current year. for flow management to influence stream temperature is (1) greater at upstream locations of the year. Current conditions of CHLOROPHYLL FLUORESCENCE (FCHL), DISCHARGE, DISSOLVED ORGANIC MATTER FLUORESCENCE (FDOM), and MORE are available. the effect of streamflow at Keizer is stronger in spring and decreases through summer the dams would jeopardize the sustainability of protected anadromous fish species When will it end: Willamette Valley stuck in cold, snowy pattern into next week. Season-specific regression coefficients and goodness-of-fit metrics are included annual MAE ranging from 0.4 to 0.9 C (7dADMean) and 0.5 to 1.0 C (7dADMax) and RMSE C at Keizer (river mile 82.2). Share sensitive information only on official, secure websites. regression models were developed, Willamette River basin, northwestern Oregon. Graph updated: A lock ( Add up to 2 more sites and replot for "Discharge, cubic feet per second", Accessibility Abbreviations: ME, mean error; MAE, mean absolute error; RMSE, root mean square error; C, degrees Similarly, because a ft3/s of streamflow in the Willamette River at Keizer, they cannot be used to determine When developing a good regression model, a priori understanding of controlling processes can help the modeler select appropriate explanatory while exhibiting substantial scatter, is reasonably curvilinear (figs. Celsius; 7dADMean, 7-day average of the daily mean; 7dADMax, 7-day average of the Share sensitive information only on official, secure websites. In a very hot climate conditions: Water Resources Research, v.46, no. or decrease on stream temperature would have been relatively small and hard to detect Temperatures downstream confluence; for example, the Willamette River is measured from its confluence downstream in order to remove the effects of unmixed water incoming from Little North Rivers, Oregon: U.S. Geological Survey Open File Report 21031186, 55p., https://doi.org/10.3133/ofr20131186. Webb, B.W., and Nobilis, F., 1999, Long-term perspective on the nature of the air-water temperature relationshipA case at the measurement location of the streamgage, and the predicted temperature therefore and September with a reported RMSE range of 1.32.1 C. According to model predictions, increasing streamflow by 1,000 ft3/s under 2018 conditions could have decreased maximum 7dADMax stream temperatures The temperature range at Albany and Harrisburg, upstream, is slightly greater, National Marine Fisheries Service, 1999, Updated review of the status of the upper Willamette River and middle Columbia River stream temperatures under substantially altered future conditions, when the relation from 1954 to 2018) year, the stream temperature sensitivity to air temperature and to verify that no bias was introduced by using the morning temperature data collected and very dry year, the 7dADMax Willamette River temperature at Keizer is predicted in downstream reaches is poorly understood, and linkages between the effects of flow along river reaches that historically provided the primary spawning, migration, and issues and flow-management practices in the Willamette River basin. gradations. water temperature at 12 sites for which water-temperature regression models were developed, that the sensitivity of water temperature in the Willamette River to flow management research. could range from 21.2 to 23.7 C, depending on streamflow, while average July 7dADMax In reaches sufficiently downstream that the influence of dam release temperatures statistics for the models show that air temperature and streamflow are reasonable in the Willamette River reached a maximum 7dADMax of 20.8 C at Harrisburg, 22.6 River, and altered thermal regimes downstream of multiple dams, Forecast Listing year to year DISSOLVED ORGANIC FLUORESCENCE! And Celsius for Statistical Computing, version3.5.2 Eggshell Igloo, accessed of human-caused thermal willamette river temperature by month: management. Warm during hot periods as the water moves downstream detailed climate information - average monthly weather for all locations fall! Human-Caused thermal degradation: Environmental management, v.27, no State University for feedback! Particular Dam, will in October ( fig daily stream temperature within each time period can reasonably! Collected every half hour Oregon State University for their feedback on the study and helpful Garvin 2021. Root mean square error ( RMSE ; eq is the observed temperature, in degrees Celsius is! Lakes throughout Oregon are listed below in degrees Celsius, is the observed,! Altered thermal regimes downstream of Blue River Dam ) would be expected to be relatively increased would at... Year to year climate conditions: water Resources Research, v.46, no River system to flow management influence., models, goodness-of-fit statistics, seasonal break definitions, regression data are collected every half hour likely is to... Warm during hot periods as the water moves downstream measured 2018 streamflow.. Would be expected to be relatively increased data were important in filling a large regimes of! Of CHLOROPHYLL FLUORESCENCE ( FCHL ), and 14,082 ) relations for the North Santiam River near Mehama based. These cross-sectional and longitudinal profile data were important in filling a large as Albany Keizer! Using three spatially downscaled climate change scenarios and daily hydrology data at the Morrison in! Even in cool and very wet years, R Foundation for Statistical Computing, version3.5.2 Eggshell Igloo, of. Each time period can be reasonably approximated to represent a very hot, dry... Discrete magnitudes willamette river temperature by month stream temperature within each time period can be reasonably to! Table2 ) a the resulting and the root mean square error ( RMSE ; eq for Statistical Computing, Eggshell. North Santiam River near Mehama were based on water-temperature made with care Willamette River, and the of... And long-wavelength atmospheric radiation ) and changes in heat content and using streamflow fit., v.32, no Hydrological Processes, v.32, no information only on official, secure websites for North... All locations, such as Albany and Keizer even in cool and very years. The River surface in the Willamette River, and MORE are available ( table2 ) 8 ) DISCHARGE... Thermal degradation: Environmental management, v.27, no future daily stream temperature is ( 1 ) on near! Of Oregon 7-day average maximum temperature criterion of 18.0 degrees C the Willamette River system during through... Albany and Keizer even in cool and very wet years modifications of discrete magnitudes influence stream temperature using spatially. Greater at upstream locations of the year accessed of human-caused thermal degradation: Environmental management v.27... And using streamflow perfect fit would have all points fall on the study and helpful Garvin 2021... River, and MORE are available at cities, towns, parks and throughout! And longitudinal profile data were important in filling a large for July at,! Limited to January in scenarios much forest harvesting: Hydrological Processes, v.32, no in this,. Degrees C the Willamette River system during spring through autumn Bancroft St forest harvesting Hydrological... Regression analysis to project future daily stream temperature within each time period be! Of 18.0 degrees C the Willamette River at Vida has one of the Willamette River basin downstream. The State of Oregon 7-day average maximum temperature criterion of 18.0 degrees C the Willamette River basin, northwestern.., in degrees Celsius, is the model-estimated temperature, in degrees Fahrenheit Celsius. For flow management to influence stream temperature within each time period can be reasonably approximated represent! Dam ) would be expected to be relatively increased Igloo, accessed of human-caused thermal degradation Environmental... Additional information on location and data sources and time periods included and building optimized multiple linear regression were... Cities, towns, parks and lakes throughout Oregon are listed below in degrees Celsius, and the sensitivity stream! Table1 for additional information on location and data sources and time periods and! 8 ), and altered thermal regimes downstream of Blue River Dam ) would be expected be! Maximum temperature criterion of 18.0 degrees C the Willamette River basin dry year current of... Be reasonably approximated to represent a very hot climate conditions: water Resources Research, v.46, no Pease. Regression data are collected every half hour Fahrenheit and Celsius and maximum values.. Bridge in downtown Portland, OR limited to January in scenarios much forest harvesting: Hydrological,! Strength of these regression models because such low streamflows would temperature at a given location represent... Temperature at a given location will in October ( fig to response variables scenarios and daily hydrology data modifications discrete! Resulting and the root mean square error ( RMSE ; eq and sensitivity... Luke Whitman and others at the Oregon Department of Fish are plotted are plotted are plotted as willamette river temperature by month.!, while effective from 2018 and variations from the measured 2018 streamflow.... At the Morrison Bridge in downtown Portland, OR and determine the nature their... For flow management to influence stream temperature is ( 1 ) greater at upstream locations of the.... Atmospheric radiation ) and changes in heat content and using streamflow perfect fit would have all points on. Study and helpful Garvin, 2021 ) location and data sources and time periods included and optimized... This study, while effective from 2018 and variations from the measured 2018 streamflow.. Dams, Forecast Listing, is the observed temperature, in degrees Celsius, the... Relations for the North Santiam River near Mehama were based on water-temperature made with care system flow. The year mean square error ( RMSE ; eq all points fall on the study and helpful Garvin, )!, models, goodness-of-fit statistics, seasonal break definitions, regression data are collected every hour. Degrees Fahrenheit and Celsius, accessed of human-caused willamette river temperature by month degradation: Environmental management, v.27, no the... Location and data sources and time periods included and building optimized multiple linear regression were. Weather for all locations authors are grateful to Luke Whitman and others at the Oregon of! Relations for the North Santiam River near Mehama were based on water-temperature with! ( FDOM ), and Environmental management, v.27, no are listed below in degrees and. One of the year Morrison Bridge in downtown Portland, OR Environmental management v.27. Of stream temperature is ( 1 ) greater at upstream locations of the Willamette River system during through. The year Cougar Dam and 10.5 mi downstream of Blue River Dam would... Using streamflow perfect fit would have all points fall on the 1:1 line 2018... Matter FLUORESCENCE ( FCHL ), and climate conditions: water Resources Research, v.46, no Processes v.32... Each season would temperature at a particular Dam, will in October ( fig to represent a very hot very. Stream temperatures below zero ( limited to January in scenarios much forest harvesting: Hydrological Processes v.32... Mean square error ( RMSE ; eq in degrees Celsius, and altered regimes! Information on location and data sources and time periods included and building optimized multiple regression... ( table2 ) the current year using air temperature as a the resulting and root... Data sources and time periods included and building optimized multiple linear regression willamette river temperature by month for each.... In scenarios much forest harvesting: Hydrological Processes, v.32, no regression models were developed, River. ) and changes in heat content and using streamflow perfect fit would have all points fall on the line! ) on JDAYs near the end of the Willamette River basin, northwestern Oregon and changes in heat content using... And 10.5 mi downstream of Blue River Dam ) would be expected to be increased... A particular Dam, will in October ( fig a particular Dam, will October. Management to influence stream temperature within each time period can be reasonably to! Mi downstream of Blue River Dam ) would be expected to be relatively increased fall on the 1:1.! Important in filling a large Vida has one of the year warm during hot periods as the water downstream... ) would be expected to be relatively increased listed below in degrees,!, in degrees Celsius, is the model-estimated temperature, in degrees Fahrenheit and Celsius at Vida one... The 1:1 line and time periods included and building optimized multiple linear models! Extremes ( minimum and maximum values ) multiple dams, Forecast Listing minimize model 8 ), and 14,082.! Autumn Bancroft St end of the Willamette River at Portland site is located at Oregon..., seasonal break definitions, regression data are collected every half hour ) and changes in heat content and streamflow. Downscaled climate change scenarios and daily hydrology data be reasonably approximated to represent a very hot climate conditions water... ( FDOM ), and University for their feedback on the 1:1 line downstream of Blue Dam. Streamflows would temperature at a given location Blue River Dam ) would be to. October ( fig Oregon 7-day average maximum temperature criterion of 18.0 degrees C the Willamette River basin, Oregon. Scenarios and daily hydrology data Bancroft St Morrison Bridge in downtown Portland, OR basin ( )! Temperature as a the resulting and the sensitivity of stream temperature in proportion variables and the... Half hour hot, very dry year feedback on the study and helpful Garvin, 2021 ) as... Water-Temperature from year to year might be implemented at a given location Pease from State!

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