Abstract
ABSTRACT Bear Lake is a hardwater lake located in a limestone basin on the border of Utah and Idaho with a surface area of 282 km2, maximum depth of 63 m, and a mean depth of 10 m. The lake was formed by tectonic activity approximately 28,000 years B.P. with no natural outfall. Inflow mainly from small tributaries probably did not equal evaporation. These conditions resulted in a concentration of carbonate salts and a unique macrochemistry, with magnesium as the predominant divalent cation. The isolation from any major drainages also led to the development of endemic fish species. In 1912, Utah Power and Light Company completed a series of canals diverting water from the Bear River into the lake during the spring and later released for downstream irrigation and power needs. Diversion of the Bear River into the lake increased water flow and presumably loadings by as much as 70 percent above historic conditions. A 2-year study recently completed found nutrient loadings into Bear Lake at meso-eutrophic level...
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