Figure 3.

Solute concentration measurements in Koocanusa Reservoir, the Elk River at Highway 93 and the Kooteanay River at Fenwick.²² (a) Koocanusa Reservoir total Se concentrations measurements at a Canadian compliance point (Lake Koocanusa South of Elk River, green)⁴⁶ and dissolved Se on the United States side of the international boarder (U.S. Geological Survey Site ID 12300110, magenta)²⁴ with their respective regulatory criteria.^45,46 Concentration measurements of total Se (b), NO₃^– (c), and SO₄^2– (d) at the Elk River at Highway 93 (orange) and the Kootenay River at Fenwick (blue).²²