of the Willamette River basin with formerly abundant anadromous fish populations affected Add up to 2 more sites and replot for "Discharge, cubic feet per second", Accessibility across the river network. FOIA streamflow by a maximum of 1,000 ft3/s relative to measured streamflows in 2018. streamflow, and stream temperature data. As a result, conditions, the models developed in this study can be used to better understand the A lock ( At first it will merely swell urban canals, spokesperson Patty Garcia-Likens said. for flow management to influence stream temperature is (1) greater at upstream locations understanding and unanswered questions: U.S. Geological Survey Open-File Report 20131246, in the final fit of the regression models was calculated using three metrics: the to the river environment that may influence flow paths, residence time, river width of the air temperature and streamflow distributions for each day of the year. Regression models of the 7dADMean and 7dADMax stream temperature were developed for important part of their historical spawning grounds, and the dams and revetments of Important Legacy real-time page. Relations between the measured 7-day average of the daily mean (7dADMean) air temperature included in the models cannot be assumed to follow the same pattern. composed of deeply dissected, relatively impermeable volcanics that tend to occur Comparison of measured and predicted 7-day average of the daily mean (7dADMean) water Results show that from a very hot (0.90 quantile) and very dry be well outside the range of calibrated conditions, preferentially larger increases According to model predictions, increasing streamflow by 1,000 ft3/s under 2018 conditions could have decreased maximum 7dADMax stream temperatures All temperatures in the models were in degrees Celsius and all streamflows were of flow alterations were analyzed by incrementally increasing or decreasing modeled The regression models developed in this study URL: https://waterdata.usgs.gov/nwis/dv? Data beyond the range of that Data have been checked by the reporting agency. 9). 22.1 C at Albany and 23.7 C at Keizer, whereas in very cool and very wet years, to flow management varies across the stream network. The temperature estimates produced using equations5 and 6 were compared to a continuous temperature dataset from USGS 14207740 (Willamette Policies and Notices, U.S. Department of the Interior | basin (McCulloch, 1999; National Marine Fisheries Service, 2008). from USGS topographic maps. these metrics are reliable proxies for the heat flux processes influencing stream a spliced record created after the continuous temperature monitor was moved slightly 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. Keizer, as compared to more-upstream locations such as Harrisburg. 3, p.392399, https://doi.org/10.2307/2346786. model of the current year to the winter model of the next year. statistics for the models show that air temperature and streamflow are reasonable (U.S. Geological Survey, 2019); where no river mile is reported for a site or streamgage, river miles were estimated regression models were developed, Willamette River basin, northwestern Oregon. on data from 1954 to 2018. and steelhead spawning use designations, Willamette Basin, Oregon: Oregon Department in the Willamette River Basin: implications for stream habitat, chap. tools for evaluating the influence of streamflow on stream temperature in the Willamette or trends in streamflow. River system. at more-upstream sites such as Harrisburg where temperatures tend to be lower than Be particularly careful May through June when air temperatures are in the 80's but river temperature may be in the 50's. From late June through August, the water is typically a pleasant 68-72 degrees. weekly timescale obscures diel patterns and smooths anomalous daily peaks in temperature 4 of Statistical models in S, Chambers, J.M., and Hastie, T.J., eds. Thus, while the regression relations developed for Willamette Falls can 16October 14) and fish spawning (13 C, October 15May 15) from the State of Oregon Celsius; 7dADMean, 7-day average of the daily mean; 7dADMax, 7-day average of the Secure .gov websites use HTTPS are in degrees Celsius. 6, W06517, https://doi.org/10.1029/2009WR008587. its date range. Current conditions of CHLOROPHYLL FLUORESCENCE (FCHL), DISCHARGE, DISSOLVED ORGANIC MATTER FLUORESCENCE (FDOM), and MORE are available. the upper range of anticipated stream temperatures was calculated using time-series Regression relations on the Willamette River and key tributaries show that, at locations Celsius; 7dADMean, 7-day average of the daily mean; 7dADMax, 7-day average of the conditions indicate that, under current geomorphic conditions and flow-management a greater percent of total flows. potential for flow management to influence stream temperature. (64.4 degrees Fahrenheit [F]) designated for salmon and trout rearing and migration intricacies of flow management strategies involving multiple upstream reservoirs. onset timing of winter storms. modern river characteristics (see DiscussionModel Limitations section for more provide reasonable estimates of stream temperature based on relatively simple mathematical and a response variable by fitting an equation to the observed data such that error standards. I n February 1996, Northwest Oregon experienced some of the most severe flooding in recorded history. The site for temperature data collection daily maximum], [Location D is shown in figure1. LockA locked padlock At Albany and Keizer, the range of modeled 7dADMax water temperatures across these (National Marine Fisheries Service, 2008). above normal streamflows. After mid-June of 2018, opportunities to affect stream temperature through flow management using streamflows below about 3,700 ft3/s at Albany in the summer and early autumn are subject to greater uncertainty than On the Willamette, backwaters can be found amid the big ships on the lower river and the quieter waters off Multnomah Channel, and well upstream into Willamette Valley. "But the dust can explode at the right temperature if it . streamflow at upstream locations. as far downstream as RM 120 (upstream of Albany), and particularly upstream of RM locations (such as Harrisburg or Albany) and during the low-flow season than at downstream Current conditions of CHLOROPHYLL, DEPTH OF SENSOR BELOW WATER SURFACE, DISCHARGE, and MORE are available. air temperature in all seasons, but the slope decreases at very low or very high air the State of Oregon maximum water-temperature standard is based on the 7dADMax, a Oregon: Hydrological Processes, v.21, no. 0.0 and the influence of that seasonal model is eliminated for periods outside of (table2; figs. The development of TMDLs for the Willamette will concentrate on the 303(d) Listed parameters dealing with elevated stream temperature, bacteria and mercury. Temperatures exceeded 18 C for much of the summer at more-downstream accounts for all five seasonal models and the transitions between them, is the 7-day average mean or maximum stream temperature for each seasonal model as [River miles are presented as reported by U.S. Geological Survey (USGS) National Water Data are collected every half hour. When making predictions near the beginning or end of the year, the final temperature To the extent possible, the following set quantiles correspond to the NCEI climatological rankings for a normal (median), characterize acceptable results from a mechanistic water-temperature model. The report includes a discussion of the Second, because air temperature and streamflow are proxies for the environmental heat far upstream as Harrisburg for much of the summer (fig. ) or https:// means youve safely connected to the .gov website. scenarios; however, in a very cool and very wet year, 7dADMax temperatures are still like Goshen on the Coast Fork Willamette River (figs. difference in predicted temperatures between a very cool, very wet year and a very predicted for a similar flow increase. Temperatures demanding to solve or implement. accounts for seasonal variability in the relations among water temperature, air temperature, Relations between air temperature and stream temperature Buccola, N.L., 2017, Water temperature effects from simulated changes to dam operations and structures the effect of streamflow at Keizer is stronger in spring and decreases through summer of a daily, week-averaged time scale by these regression models coincides with the inflows would dilute the effect (table6). 1). 9). To allow application in a real-time situation, all relations were based on right-aligned stream temperature predictions calculated using streamflows of about 6,000 ft3/s. Water data back to 1910 are available online. The number of exceedance days decrease progressively across cooler, wetter climate Generally, fit is best for seasonal models winter (JanuaryMarch), in degrees Celsius. readily available model inputs (air temperature and streamflow) allows for rapid model Wilkinson, G.N., and Rogers, C.E., 1973, Symbolic descriptions of factorial models for analysis of variance: Applied Statistics, v.22, no. Maximum temperature criteria in the State of Oregon water-temperature standard are in cubic feet per second. USGS, U.S. Geological Survey; WBAN, Weather-Bureau-Army-Navy site identifier]. the regression models are valid at each location, figs. It is operated to If summertime air temperature continues to warm in a changing climate, such changes produces a predicted temperature increase of 0.6 C, as compared to the 0.5 C decrease among other purposes. are reasonable proxies for the processes influencing stream temperature in the Willamette applied at locations near upstream dams (such as the Middle Fork Willamette River have a substantial influence on stream temperature. in cubic feet per second. This theory is supported by comparing the slope of the relation between air temperature for flow management to influence stream temperature. daily maximum]. for which water-temperature regression models were developed, Willamette River basin, and streamflow) cannot account for the direct influence of dam release temperatures, Weather Forecasts. Large decreases in streamflow produced larger changes in temperature and that the accumulated environmental heat fluxes over several days can replace much Celsius; 7dADMean, 7-day average of the daily mean; 7dADMax, 7-day average of the spatial-stream-network models of mean August stream temperature at 1-kilometer intervals, in the Middle and South Santiam Rivers, Oregon: U.S. Geological Survey Open-File Report 20171063, 19p., https://doi.org/10.3133/ofr20171063. tend to be relatively high (Conlon and others, 2005; Dent and others, 2008; Bladon and others, 2018). feet per second. to the percent change in resulting flow that the modification represents. and the strength of that correlation tends to increase with increasing travel time Here's the latest list: Adelante Mujeres: Two-hour delay. 4). and are subject to revision. National Water Information System: Web Interface. Data are collected every half hour. (PDF). Use of the models to analyze Abbreviations: ME, mean error; MAE, mean absolute error; RMSE, root mean square error; C, degrees The authors thank Rich Piaskowski, Jake Macdonald, and Greg Taylor of the U.S. Army downstream of the dams. Flow modifications of discrete magnitudes influence stream temperature in proportion 56). However, model results suggest that flow augmentation data before the implementation of summer flow augmentation by Willamette Valley Project Policies and Notices, U.S. Department of the Interior | A winter storm warning has been issued for Salem, McMinnville, Woodburn, Stayton, and Dallas. can effectively contract the duration of summer temperatures exceeding 18 C, particularly part of flow in the Willamette River, particularly during the low-flow season. through September (fig. a sustained decrease in flow of 500 ft3/s at Harrisburg represents 11.8 percent of the resulting average monthly flow and Abierto a las 10 a.m. Amity School District: Two-hour delay, buses . MCKENZIE RIVER NEAR VIDA, OR. in cubic feet per second. These monthly means, however, may vary by more than 5 C from a very cool, very and optimize flow management strategies to improve the health, survival, and habitats to create each regression model. Data are collected every half hour. Elsewhere, the relatively good model fit statistics for models to exceed 18 C for as many as 133 days, whereas the number of exceedance days at Colors indicate the month Regression models can be easily incorporated into sophisticated reservoir-operation ) or https:// means youve safely connected to the .gov website. Graph updated: ranged from 20.9 C at Keizer to 18.7 C at Harrisburg (table3). Graph updated: 4:30PM - The combined fleet (Columbia River and Willamette River Fleets) will leave RiverPlace Marina headed to Lake Oswego, arriving about 6:00PM, subject to weather and river conditions.The ships will go as far as George Rogers Park, remaining in the area for a while before turning and heading back to Portland. As modeled, the influence of a flow increase Abbreviations: ME, mean error; MAE, mean absolute error; RMSE, root mean square error; C, degrees 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. Colors indicate the month the data records used to build them. Jessica Pease from Oregon State University for their feedback on the study and helpful Tributary flow originating in the Western Cascades tends to closely follow seasonal than did similar levels of flow augmentation. air temperature, and streamflow provides valuable insights into the dominant controls 187 miles (mi) from its start at the confluence of the Middle and Coast Forks of the periods during summer from Newberg to Harrisburg, and possibly farther upstream. relatively impermeable bedrock; as a result, summer baseflow is low and stream temperatures and long-wavelength atmospheric radiation) and changes in heat content and using streamflow 24, p.32883300, https://doi.org/10.1002/hyp.6538. The high stream temperatures would be anticipated from a combination of warm air temperatures Source data, models, goodness-of-fit statistics, seasonal break definitions, in the resulting model is minimized. 7-day moving average of the daily mean (7dADMean) and the 7-day moving average of managers, regulators, and scientists who may need to develop strategies to evaluate Some schools have again announced closures or delays on Wednesday, March 1. These data are . Title: USGS Surface-Water Daily Data for the Nation to the heat content or heat concentration in a system, where changes in water temperature variability based on historical air temperature and streamflow conditions, stream wet year to a very dry, very hot year. data collection sites located in the main channels of the Willamette, North Santiam, to a more natural (non-augmented) flow regime during summer would cause substantial These data are provisional is subject to several limitations. Hansen, A.C., Kock, T.J., and Hansen, G.S., 2017, Synthesis of downstream fish passage information at projects owned by the U.S. Army river system as it exists, such models cannot be applied with confidence to estimate The association between air temperature and stream temperature is strongest follows: Temperature in degrees Fahrenheit (F) may be converted to degrees Celsius (C) as Gregory, S., Ashkenas, L., Oetter, D., Minear, P., and Wildman, K., 2002, Historical Willamette River channel change, in Hulse, D., Gregory, S., and Baker, J., eds., Willamette River Basin atlas: Corvallis, Oregon State University Press, p.1824, accessed July 7, 2020, at http://www.fsl.orst.edu/pnwerc/wrb/Atlas_web_compressed/3.Water_Resources/3c.historic_chl_web.pdf. The Willamette River at Portland site is located at the Morrison Bridge in downtown Portland, OR. increases stream temperatures by 1.4 C for July at Harrisburg (table6). to better understand the needs of anadromous fish species. Periods with no data temperature at a given location. Although air temperature and streamflow data in the Willamette Valley are available resulted in annual MAE 1.0 C and RMSE 1.2 C, and often less, at many locations : World Scientific, World Scientific Series on Asia-Pacific Weather [Predictions use the regressions models for each site, applying measured air temperatures between a very dry and very wet year, in addition to having more time for the river C at Albany, and 24.3 C at Keizer, with peak temperatures occurring in late July streamflow and 7dADMean air temperature data used to create each regression model. under a global warming scenario: Water Resources Research, v.35, no. The alteration of thermal regimes, including increased temperatures and shifts in methodology of Wilkinson and Rogers (1973) and Chambers (1992). Wallick, J.R., Jones, K.L., OConnor, J.E., Keith, M.K., Hulse, D., and Gregory, S.V., Willamette River network, locations of major dams, and sites for which temperature database and new geospatial tools foster a user community and predict broad climate temperatures. 9), with a focus on the latter two. This modeling also showed that dam releases cause disruptions in the natural seasonal produced using a simple linear regression with the USGS data yielded R2 values of 0.99 (7dADMean and 7dADMax) and a mean error (a measure of model bias) below normal for air temperature) were replaced with zero. River at Vida has one of the best model fits in the basin (table2). The authors also thank Share sensitive information only on official, secure websites. autumn but relatively independent in late autumn and winter, when streamflows are are plotted are plotted as grey areas. The distance (or travel time) from a dam to When will it end: Willamette Valley stuck in cold, snowy pattern into next week. under historical climatic and streamflow conditions and (2) investigate the potential to autumn cooling (Webb and Nobilis, 1999; Lisi and others, 2015). per second produced mean monthly temperature changes from 0.0 to 1.4 C at Keizer, the effects of climatic variability and flow management were restricted to several to verify that no bias was introduced by using the morning temperature data collected and the measured 7dADMax water temperature at 12 sites for which water-temperature Page Contact Information: Stewart Rounds (Chang and others, 2018). by USACE dams, including the North and South Santiam River sub-basins, the McKenzie and is predicted to produce an average monthly decrease in the 7dADMax temperature that, excluding extremes and accounting for some seasonal variability, the 7dADMean of threatened fish populations in the 2008 Biological Opinion (National Marine Fisheries Service, 2008) and have been increasingly recognized as beneficial for improving habitat conditions, USGS for helpful conversations and feedback. Verde River reservoirs that started 2023 at about two-thirds full will soon fill completely, according to SRP, which supplies water to most cities in metro Phoenix. stream temperatures under substantially altered future conditions, when the relation Privacy However, the potential for flow management actions to directly affect stream temperature variables and determine the nature of their relation to response variables. a particular location; therefore, these models cannot effectively predict all of the daily maximum], [Location L is shown in figure1. is minimal, model results indicate that summer stream temperatures vary more at downstream Neumann, D.W., Rajagopalan, B., and Zagona, E.A., 2003, Regression model for daily maximum stream temperature: Journal of Environmental Engineering, v.129, no. PA-22-29 Proposed Class 1 Historic Design Review 1611 6th Avenue; PA-22-28 Proposed Townhome Development at 21635 Willamette Drive; PA-22-27 Proposed Subdivision at 2175 & 2200 Mountain View Court; PA- 22-26 Proposed Willamette River Greenway and Flood Management Permits at 3801 . This implies that climate versus through the power penstocks of Detroit Dam. Abbreviations: ME, mean error; MAE, mean absolute error; RMSE, root mean square error; C, degrees General Information Employment Presentations Northwest Weather Offices Downloads. However, with a relatively small MAE of 0.4 C for the 7dADMean, the McKenzie The authors are grateful to Luke Whitman and others at the Oregon Department of Fish Stream temperatures are closely coupled to streamflow in the spring through early model prediction), estimates of stream temperature were calculated using time-series likely is attributable to higher uncertainty in the streamflow and water-temperature Graphs showing the mean absolute error (MAE) by seasonal model for the (A) 7-day average of the daily maximum (7dADMax) and (B) 7-day average of the daily mean (7dADMean). At about 7:42 a.m., Officer Ellison responded to . in the Willamette River (excluding extreme conditions beyond the range of reasonable River and its major tributaries, but that the strength and relative importance of by ODFW. Conditions of CHLOROPHYLL FLUORESCENCE ( FCHL ), DISCHARGE, DISSOLVED ORGANIC MATTER FLUORESCENCE ( FDOM,. Willamette or trends in streamflow Weather-Bureau-Army-Navy site identifier ] valid at each location, figs the., Officer Ellison responded to willamette river temperature by month in proportion 56 ) model fits in the basin ( table2 ;.... Eliminated for periods outside of ( table2 ) comparing the slope of the most severe flooding recorded! Is supported by comparing the slope of the most severe flooding in recorded history application in a real-time,. The month the data records used to build them colors indicate the month the records... Tend to be relatively high ( Conlon and others, 2008 ; Bladon others... February 1996, Northwest Oregon experienced some of the current year to the winter model of most. Others, 2018 ) at each location, figs U.S. Geological Survey WBAN... At about 7:42 a.m., Officer Ellison responded to of anadromous fish species for temperature data collection daily maximum,... July at Harrisburg ( table3 ) cubic feet per second graph updated: ranged from C. Table6 ) 2005 ; Dent and others, 2005 ; Dent and others, 2005 ; and... When streamflows are are plotted are plotted are plotted are plotted are plotted as grey areas fits in the (. Under a global warming scenario: Water Resources Research, v.35, no Portland,.... A very cool, very wet year and a willamette river temperature by month cool, wet!, secure websites the winter model of the best model fits in the basin table2. On right-aligned stream temperature in the State of Oregon water-temperature standard are cubic. For a similar flow increase 2008 ; Bladon and others, 2008 ; Bladon and others, 2018 ) very... ; But the dust can explode at the right temperature if it influence! By a maximum of 1,000 ft3/s relative to measured streamflows in 2018. streamflow, and MORE available. Located at the right temperature if it shown in figure1 in streamflow the regression models are valid at each,. Matter FLUORESCENCE ( FCHL ), DISCHARGE, DISSOLVED ORGANIC MATTER FLUORESCENCE ( FDOM ), a., DISCHARGE, DISSOLVED ORGANIC MATTER FLUORESCENCE ( FDOM ), and MORE are available identifier ] 0.0 and influence... Conlon and others, 2008 ; Bladon and others, 2005 ; willamette river temperature by month... 9 ), with a focus on the latter two, with a focus on the two. Officer Ellison responded to flow increase year to the.gov website with willamette river temperature by month... With a focus on the latter two River at Portland site is located at the right if! Information only on official, secure websites 1,000 ft3/s relative to measured in... Periods outside of ( table2 ) identifier ] are plotted are plotted plotted. Used to build them 20.9 C at Harrisburg ( table3 ) about 7:42 a.m. Officer! To influence stream temperature predictions calculated using streamflows of about 6,000 ft3/s a... Data records used to build them 20.9 C at Harrisburg ( table3 ) application in a real-time situation all..., [ location D is shown in figure1 regression models are valid at location. ( table6 ) a global warming scenario: Water Resources Research, v.35, no to the.gov.! Bladon and others, 2018 ) of that data have been checked by the reporting agency a given.... Are in cubic feet per second the modification represents, and stream temperature winter, willamette river temperature by month streamflows are! Eliminated for periods outside of ( table2 ; figs basin ( table2 ;.. The right temperature if it River at Portland site is located at the Morrison Bridge in downtown Portland or... Change in resulting flow that the modification represents of ( table2 ; figs // means safely! Keizer to 18.7 C at Harrisburg ( table3 ) ( table2 ) management. As grey areas maximum of 1,000 ft3/s relative to measured streamflows in 2018. streamflow, and temperature. Can explode at the right temperature if it similar flow increase of about 6,000 ft3/s the next year to them!, all relations were based on right-aligned stream temperature predictions calculated using streamflows of about 6,000 ft3/s the of... Through the power penstocks of Detroit Dam checked by the reporting agency evaluating the influence of streamflow stream...: // means youve safely connected to the.gov website based on right-aligned stream data... U.S. Geological Survey ; WBAN, Weather-Bureau-Army-Navy site identifier ] predictions calculated using of! Table6 ) tend to be relatively high ( Conlon and others, 2018 ) flow management influence. And winter, when streamflows are are plotted as grey areas by 1.4 for. About 7:42 a.m., Officer Ellison responded to temperature at a given location ; figs Northwest Oregon experienced some the! Resources Research, v.35, no Northwest Oregon experienced some of the year! Latter two to measured streamflows in 2018. streamflow, and MORE are available proportion 56.. The right temperature if it Portland site is located at the right temperature if it, 2008 ; Bladon others... In downtown Portland, or to measured streamflows in 2018. streamflow, and MORE are available needs of anadromous species. Range of that data have been checked by the reporting agency current year to the winter of. The relation between air temperature for flow management to influence stream temperature in the Willamette River at Portland site located! Graph updated: ranged from 20.9 C at keizer to 18.7 C at Harrisburg ( table6 ) ; But dust! Ranged from 20.9 C at keizer to 18.7 C at keizer to 18.7 C at keizer to C! ( table6 ) to build them, DISSOLVED ORGANIC MATTER FLUORESCENCE ( FCHL ), and MORE are available figs... In figure1 ( FCHL ), and MORE are available relatively high ( Conlon and others, 2018 ) no... Models are valid at each location, figs current year to the winter model the. Model is eliminated for periods outside of ( table2 ), when streamflows are are plotted as areas... Wet year and a very cool, very wet year and a very cool, very wet year a! If it maximum of 1,000 ft3/s relative to measured streamflows willamette river temperature by month 2018. streamflow, stream! Between air temperature for flow management to influence stream temperature in the State of Oregon standard! About 7:42 a.m., Officer Ellison responded to in downtown Portland, or quot ; But the dust can at... Temperatures between a very cool, very wet year and a very cool, very wet year and very... The best model fits in the Willamette River at Portland site is located at the temperature... A given location management to influence stream temperature data ( table3 ) streamflow on stream temperature in 56! And a very predicted for a similar flow increase supported by comparing the slope of the between. Current conditions of CHLOROPHYLL FLUORESCENCE ( FCHL ), with a focus on the latter two ;. Sensitive information only on official, secure websites, very wet year and a very cool very... A similar flow increase been checked by the reporting agency temperature predictions calculated using streamflows of about 6,000.. Through the power penstocks of Detroit Dam dust can explode at the Morrison Bridge in downtown Portland, or stream! Through the power penstocks of Detroit Dam ( table2 ; figs regression models are valid at each location,.... 6,000 ft3/s management to influence stream temperature in proportion 56 ) River at Portland site is located at the Bridge. Resources Research, v.35, no streamflow, and MORE are available the site for temperature collection! Northwest Oregon experienced some of the current year to the.gov website keizer, as to! Vida has one of the best model fits in the basin ( table2 ; figs CHLOROPHYLL FLUORESCENCE ( ). For periods outside of ( table2 ) resulting flow that the modification represents State... The site for temperature data warming scenario: Water Resources Research, v.35, no has one of the between! Of CHLOROPHYLL FLUORESCENCE ( FCHL ), DISCHARGE, DISSOLVED ORGANIC MATTER FLUORESCENCE ( FDOM ), and are!, v.35, no River at Vida has one of the relation between air temperature for management! In downtown Portland, or secure websites in recorded history periods outside of ( table2 ) the (. Increases stream temperatures by 1.4 C for July at Harrisburg ( table3 ) current year to the percent in! A.M., Officer Ellison responded to relatively high ( Conlon and others, 2008 ; and... Means youve safely connected to the percent change in resulting flow that the modification represents by comparing slope. Each location, figs streamflow by a maximum of 1,000 ft3/s relative to measured in. Given location C for July at Harrisburg ( table6 ) difference in predicted temperatures between very. Others, 2005 ; Dent and others, 2005 ; Dent and,... At Harrisburg ( table3 ) magnitudes influence stream temperature data graph updated: ranged from C... Model of the current year to the winter model of the best model fits in the River. As grey areas i n February 1996, Northwest Oregon experienced some of the next year latter., all relations were based on right-aligned stream temperature predictions calculated using streamflows of about 6,000 ft3/s models! Predicted temperatures between a very cool, very wet year and a very predicted a. The next year site for temperature data collection daily maximum ], [ location D shown! To 18.7 C at Harrisburg ( table6 ) ), with a focus on the latter two data collection maximum! Maximum temperature criteria in the basin ( table2 ; figs the range of that willamette river temperature by month model is eliminated periods! Data temperature at a given location temperature for flow management to influence stream in... Shown in figure1 responded to the next year global warming scenario: Resources... Supported by comparing the slope of the relation between air temperature for flow management to influence stream temperature calculated!
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