Nebraska Academy of Sciences


Date of this Version



1989: Transactions of the Nebraska Academy of Sciences XVII: 111-115. Copyright © 1989 Holland and Peters


During a 1986-87 study of microhabitat utilization by Platte River fauna we noted a persistent difference in conductance between north and south banks. A series of transects across the river, measured on 11 August 1987, between River Miles 78-59, demonstrated that the conductivity gradient persisted throughout the 32 km study segment. Typical readings were 315 umhos cm-1 for the north side and 550 umhos cm-1 for the south side. Additional upstream measurements showed that the gradient originates at the confluence of the Platte River and the Loup River Power Canal (RM 101). Upstream, the Platte River mean monthly conductivity is 922 umhos cm-1 while the Canal is 283 umhos cm-1 . Correlation analysis of the relative contribution of the Canal to total downstream discharge shows a significant negative correlation (r= -0.60; P=.0001) to the conductivity levels of the Platte River below the confluence. Occurrence of this conductivity gradient may indicate a lack of mixing of other chemical constituents in the water including pollutants.

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