Upper Midwest Environmental Sciences Center
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Long Term Resource Monitoring Program
Water Quality Data 
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Last updated February 8, 1999
Foreword UMESC obtained daily water temperatures, mostly from power plants, for Pools 5, 9, 15, 19 and 26 between 1984 and 1997, inclusive. Of the possible 5,113 daily values for the 14-year period, 94% were available for Pool 4, 91% for Pool 9, 89% for Pool 15, 100% for Pool 19, and 95% were available for Pool 26. Missing data for daily temperatures for less than four days were estimated by linear interpolation of data from the same station. Estimates of missing data for four or more days were obtained through linear regression analysis by river mile and data values from the closest one or two stations. Winter water temperatures at Pools 5, 9, and 15 were often as much as five degrees Fahrenheit above freezing, and above the temperatures reported from Pool 19. Further investigation found that winter temperature measurements were taken near heaters for the northern pools. For this reason, winter temperatures for Pools 5, 9, and 15, that were higher than the values from Pool 19, were replaced by measurements from Pool 19. Reported winter temperatures for Pool 19 were usually within two degrees of freezing. Water temperatures for all other dams were estimated using linear interpolation, by river mile, from the temperature monitoring locations. UMESC has used temperature estimates for Lock and Dam 4 for estimates for Lock and Dams 1 - 3. Those pools are a maximum of 90 miles from Lock and Dam 4. After daily water temperatures for each pool were calculated, the measurements were then averaged for each dam on a weekly basis for the 14-year period. Download all files of only the specific Pool: (Files are in ASCII format)
DISCLAIMER These data have been generated by State
agencies under contract with the Department of the Interior and the Upper
Midwest Environmental Sciences Center (UMESC). Although these data have
been processed successfully on a computer system at the UMESC, no warranty,
expressed or implied, is made regarding the accuracy or utility of the
data on any other system or for general or scientific purposes, nor shall
the act of distribution constitute any such warranty. However, error correction
is a continuing process, and the UMESC routinely makes changes to data
as errors are discovered. The file date is referred to as the release
date and should be mentioned in all references to data. These data have
been provided as a unit package to ensure that you receive a valid dataset
collected in a consistent manner. Methods, purposes, and conditions can
vary dramatically among data-collecting efforts and these data should
not be combined with other datasets from the UMESC or other sources unless
the user fully understands the procedures and purposes used to create
each set of data and can verify that data are comparable across sources.
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U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.umesc.usgs.gov/data_library/water_quality/water_temp_page.html
Page Contact Information: Contacting the Upper Midwest Environmental Sciences Center
Page Last Modified:
October 2, 2007
