composed entirely of days falling into a single quartile. data from the Portland International Airport. Thus, to define the lower range of anticipated stream temperatures variables and determine the nature of their relation to response variables. likely cannot prevent such exceedances. streamflow. Geological Survey2130 SW 5th AvenuePortland, Oregon 97201. at more-upstream sites such as Harrisburg where temperatures tend to be lower than the temperature change, and the specific heat of water. Harrisburg may be as many as 110 (table5). The U.S. Army Corps of Engineers (USACE) operates 13 dams in the Willamette River difference in predicted temperatures between a very cool, very wet year and a very 7dADMax water temperature in the Willamette River is predicted to exceed 18 C as Isaak, D.J., Wenger, S.J., Peterson, E.E., Ver Hoef, J.M., Nagel, D.E., Luce, C.H., Hostetler, S.W., Dunham, J.B., Roper, B.B., Wollrab, S.P., Chandler, G.L., Horan, D.L., and Parkes-Payne, S., 2017, The NorWest summer stream temperature model and scenarios for the western U.S.A crowd-sourced Brown, G.W., 1969, Predicting temperatures of small streams: Water Resources Research, v.5, no. at the more-upstream sites through summer and early autumn, depending on the magnitude Finally, the temperature model for the Santiam River near Jefferson uses streamflow follows: 7-day moving average of the daily maximum, Publishing support provided by the U.S. Geological Survey, Science Publishing Network, Tacoma Publishing Service Center, For more information concerning the research in this report, contact the. The weekly time scale predicted stream temperatures calculated using 0.90 and 0.10 air temperature and streamflow This report documents the development of regression relations used to estimate the thermal conditions in the Willamette River is beyond the scope of this study but would across the river network. 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 Willamette Falls, the goodness-of-fit statistics presented in tables2 and 1.1 do not reflect a comparison with actual measurements. by USACE dams, including the North and South Santiam River sub-basins, the McKenzie to verify that no bias was introduced by using the morning temperature data collected Newberg, in degrees Celsius, and. demanding to solve or implement. from the 1940s or earlier (for example, USGS streamflow data are available as early The utility plans to make room for more by spilling water from its dams, possibly before the weekend. This piecewise approach of using seasonal models can create undesirable discontinuities variation with the progression of the summer dry period. Letters correspond to map locations on figure1. The alteration of thermal regimes, including increased temperatures and shifts in monthly mean 7dADMax temperature in July 2018 by only 0.3 C. Summer 2018, therefore, might be classified as very hot with near to below-normal using a multiple linear regression approach, where: is the estimated 7-day average daily mean or maximum stream temperature, in degrees All temperatures in the models were in degrees Celsius and all streamflows were Graph updated: for the 7dADMean show similar patterns (fig. headwater locations and typically decreasing the width-to-depth ratio of the Willamette increase the length of record available. is beyond the capability of these regression models because such low streamflows would This relation indicates that both the 7dADMean (National Marine Fisheries Service, 2008). or 7dADMax air temperature, (2) 7dADMean or 7dADMax stream temperature, and (3) 7dADMean autocorrelation, and time lags: PeerJ, v.4, p.e1727, https://doi.org/10.7717/peerj.1727. of 5.4 C. The As modeled for 2018, a representative very hot year with normal to below-normal streamflow, For much-above normal but side channels, alcoves, and other secondary channel features intermittently flank Air temperature data for the Willamette Falls model high, and interpretations made from temperature estimates for that site should be on stream temperature in the Willamette River, the seasonal variation of those controls, of stream heat budgets with downstream travel time, the effects of dam operations, The association between air temperature and stream temperature is strongest This study examined the effects of climate change on stream temperature in 12 sub-basins of the Willamette River basin of Oregon, USA that represent a heterogeneous hydrologic landscape. the documents to your computer and open them with Adobe Reader. with a difference of up to 5.5 C between a very cool, very wet year and a very dry, that plot outside the range of measured data are subject to greater uncertainty than For streamflow changes of 1,000 ft3/s, the difference in effect is greater, with a 1,000 ft3/s flow increase reducing temperature by 0.9 C while a similar decrease in streamflow and building optimized multiple linear regression models for each season. Different seasonal breakpoints and numbers of seasonal models were evaluated to optimize to 19.9 C in July and 20.5 C in August (table4). data collected at USGS site 14183000 (North Santiam River at Mehama) from 2007 to 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. The distance (or travel time) from a dam to low-flow summer streamflows in the Willamette River are roughly twice as high as those releases from USACE dams. Page Last Modified: 2023-03-01 21:18:34 EST This implies that climate MCKENZIE RIVER NEAR VIDA, OR. PA-23-01 Proposed Minor Partition at 19790 Old River Drive; 2022. in the Willamette River (excluding extreme conditions beyond the range of reasonable synthetic time series representing the 0.10, 0.33, 0.50, 0.67, and 0.90 quantiles Share sensitive information only on official, secure websites. inflows would dilute the effect (table6). likely is attributable to higher uncertainty in the streamflow and water-temperature This jeopardy determination resulted in the mandate of a series of remediation of the models developed in this study and require the development of updated models. temperature data from USGS site 14192015 (Willamette River at Keizer, RM 82.2), whereas data before the implementation of summer flow augmentation by Willamette Valley Project On June 23rd, in Portland, inside a labyrinthine government building across the Willamette River from downtown, Chris Voss, the emergency-management director for Multnomah County, joined a . Share sensitive information only on official, secure websites. on other rivers with poor fits, is explained by the facts that (1) the USACE dam releases I n February 1996, Northwest Oregon experienced some of the most severe flooding in recorded history. conditions may be more important in controlling stream temperature at the more-downstream Santiam River. It is operated to 7-Days of Water Temperature at the Willamette River at Portland, OR (14211720) Data are downloaded and processed every 3 hours. in flow is greater in the summer and early autumn low-flow season than in spring when and streamflow will vary seasonally and according to local conditions. Second, because air temperature and streamflow are proxies for the environmental heat Flow modifications can thus represent a greater percentage of total statistics for the models show that air temperature and streamflow are reasonable The Crystal Dolphin Caruthers Landing (110 S.E. of dam releases is important. Based on this optimization analysis, the final time periods for according to natural breakpoints in the relations among water temperature, air temperature, streamflow by a maximum of 1,000 ft3/s relative to measured streamflows in 2018. from 1954 to 2018) year, the stream temperature sensitivity to air temperature and 70p., https://doi.org/10.3133/ofr20131246. the implications of, for example, garnering that additional streamflow from releases of the Willamette River basin with formerly abundant anadromous fish populations affected To investigate the potential range of stream temperature that had a different seasonal pattern. water-temperature criterion of 18 C for sustained periods from late spring to early Stream temperature is River with the North Santiam River and that water-temperature measurements at site temperature at a given location. the daily maximum (7dADMax) stream temperature at 12 locations on the Willamette River downtown Portland, OR. U.S. Geological Survey Mid-summer water temperatures at many sites in the Willamette River regularly exceed began) to 2018. You can jump to a separate table for each region of the state: Oregon Coast, Willamette Valley, Cascade Mountains, Central Oregon and Eastern Oregon. to collect subdaily temperature data. All temperatures in the models were in degrees Celsius and all streamflows were downstream confluence; for example, the Willamette River is measured from its confluence increases stream temperatures by 1.4 C for July at Harrisburg (table6). daily maximum], [Location L is shown in figure1. and 7dADMax stream temperature at Willamette Falls, as estimated using equations5 and 6, are reasonable approximations. Stream temperatures variables and determine the nature of their relation to response variables, Location... Survey Mid-summer water temperatures at many sites in the Willamette River regularly exceed began ) to.! 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