Selenium in the Blackfoot, Salt, and Bear River Watersheds

Environmental Monitoring and Assessment
By:  and 



Nine stream sites in the Blackfoot River, Salt River, and Bear River watersheds in southeast Idaho, USA were sampled in May 2001 for water, surficial sediment, aquatic plants, aquatic invertebrates, and fish. Selenium was measured in these aquatic ecosystem components, and a hazard assessment was performed on the data. Water quality characteristics such as pH, hardness, and specific conductance were relatively uniform among the nine sites. Of the aquatic components assessed, water was the least contaminated with selenium because measured concentrations were below the national water quality criterion of 5 μ g/L at eight of the nine sites. In contrast, selenium was elevated in sediment, aquatic plants, aquatic invertebrates, and fish from several sites, suggesting deposition in sediments and food web cycling through plants and invertebrates. Selenium was elevated to concentrations of concern in fish at eight sites (> 4 μ g/g in whole body). A hazard assessment of selenium in the aquatic environment suggested a moderate hazard at upper Angus Creek (UAC) and Smoky Creek (SC), and high hazard at Little Blackfoot River (LiB), Blackfoot River gaging station (BGS), State Land Creek (SLC), upper (UGC) and lower Georgetown Creek (LGC), Deer Creek (DC), and Crow Creek (CC). The results of this study indicate that selenium concentrations from the phosphate mining area of southeast Idaho were sufficiently elevated in several ecosystem components to cause adverse effects to aquatic resources in southeastern Idaho.

Publication type Article
Publication Subtype Journal Article
Title Selenium in the Blackfoot, Salt, and Bear River Watersheds
Series title Environmental Monitoring and Assessment
DOI 10.1007/s10661-005-1618-4
Volume 104
Issue 1-3
Year Published 2005
Language English
Publisher Springer
Contributing office(s) Columbia Environmental Research Center
Description 31 p.
First page 309
Last page 339
Online Only (Y/N) N
Additional Online Files (Y/N) N
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