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Bear River Water Quality: Phosphorus Control and the Impacts of Exchanging Water with Willard Reservoir: final report to the Division of Water Resources, Utah Department of Natural Resources;

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Title	Bear River Water Quality: Phosphorus Control and the Impacts of Exchanging Water with Willard Reservoir: final report to the Division of Water Resources, Utah Department of Natural Resources;
Description	The following conclusions have been reached for Part I of the study: 1. Much of the phosphorus carried by the streams that will feed the proposed reservoirs in the Bear River Watershed is derived from runoff and erosion of the land in the watershed. Spring runoff and runoff associated with rainfall and snow melt are major contributors of total phosphorus to these streams. 3. Streambank erosion, enhanced by landsliding in some areas, may be an important source of phosphorus. 4. Soil and streambank erosion in the Battle Creek, Deep Creek, Fivemile Creek, and Weston Creek areas of Franklin County, Idaho can contribute substantially to the phosphorus load of the Bear River during runoff events. Recent placement of much of the highly erodible soils in this area into conservation reserves may reduce the phosphorus producing potential of this area. 5. Soil erosion control practices commonly used in agriculture, combined with streambank erosion control and landslide management techniques, hold considerable promise for substantial reductions in phosphorus control for the Bear River and its tributaries which will feed the proposed reservoirs. 6. Waste water effluents may contribute up to 20 percent of the phosphorus load of the Bear River passing Cutler Dam. The Logan City lagoons alone may account for 10 percent of this load. The actual fate of waste water effluent phosphorus due to chemical precipitation and biological immobilization/mineralization is not known. 7. Feedlot and dairying contributions of phosphorus in the basin below Bear Lake are likely to contribute less than 3 percent of the phosphorus passing Cutler Dam. 8. Algal available phosphorus in the Bear River at Honeyville may approach 100 percent of total phosphorus at specific times of the year. PART II. Willard Reservoir was found to be a frequently mixed (polymictic) eutrophic water body with spring and early summer algal blooms that were dominated by Aphanizominon sp. Depletion of oxygen in the water column to concentrations approaching 50 percent of saturation in August, despite the lack of thermal stratification, is evidence of a large oxygen demand by the sediments of the reservoir. Chlorophyll a concentrations in the surface waters exceeded 66 ug/L at one location in the reservoir in March, but were less than 2 ug/L at three locations in late August. Light extinction in the water column in March, June, and early August showed two rates, with extinction below approximately 2 m being higher. This may indicate the presence of a sub-surface layer of algae during periods of high algal production. Total dissolved solids and electrical conductivity were essentially equal throughout the reservoir. Empirical models predicted that exchanging Bear River water for Weber River water would not produce a noticeable change in the algal production and trophic state of the reservoir. The use of Bear River water was predicted to result in an increase in maximum salinity of the reservoir of less than 200 mg/L. This increase in salinity would not be expected to interfere with any anticipated uses of Willard Reservoir water.
Author	Sorensen, Darwin L. Caupp, Craig Barker, Kenneth W. Ihnat, Jean M.
Contributers	Utah Water Research Laboratory
Original Date	December 1987
Publisher of Original	Utah Water Research Laboratory, Utah State University, Logan, Utah
Location	Bear River Watershed (Utah-Idaho) Willard Reservoir (Utah) Idaho Utah United States
Subject (LCSH)	Water quality--Bear River (Utah-Idaho)--Environmental conditions Bear River Watershed--Environmental conditions
Time Periods	1980-1989 20th century
Material type (Local)	Reports
Source	Utah State University, Merrill-Cazier Libary, Special Collections and Archives, University Archives 17.9:73 no. 67
Collection	Utah State University, Merrill-Cazier Library, Special Collections and Archives, USU Archives
USU Call Number	17.9:73 no. 67
Cited by	Bear River Watershed Historical Bibliography / compiled by Utah State University Libraries, Special Collections and Archives, 2005
Digital Publisher	Digitized by: Utah State University, Merrill-Cazier Library
Date.Digital	2009-03
Type	Text
Format	image/jpeg
Conversion Specifications	Scanned by Utah State University Library using Epson Expression 10000 scanner, 8-bit RGB, at 400 dpi, Archival file is uncompressed TIFF (400 dpi); display file is JPEG (300 dpi) to allow some zoom, while still minimizing file space. OCR text and display pdf generated using CONTENTdm OCR Extension. If pdf does not display correctly, try switching to a different browser or different reader.
Rights	Reproduction for publication, exhibition, web display or commercial use is only permissible with the consent of the USU Libraries University archivist, phone (435) 797-0894
Contributing Institution	Utah State University, Merrill-Cazier Library
Identifier	17973no67
Search Date	1987-12
Date created	2012-10-26

Title	Front Cover
Transcript	BEAR RIVER WATER QUALITY: PHOSPHORUS CONTROL AND THE IMPACTS OF EXCHANGING WATER WITH WILLARD RESERVOIR Final Report to the Division of Water Resources Utah Department of Natural Resources UWRL LIBRARY LOAN COPY ro r^ r^.. v£> as. ■ r-- O t—l a Utah Water Research Laboratory Utah State University Logan, Utah December 1987
Date created	2009-04-07

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Bear River Water Quality: Phosphorus Control and the Impacts of Exchanging Water with Willard Reservoir: final report to the Division of Water Resources, Utah Department of Natural Resources;

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