Relationships between selected surface water quality parameters of the Powder River at Moorhead, Montana for the period of record 1972 through 2001. The following figures represent data available from the U.S. Geological Survey stream gage station #06324500 at Moorhead.

Figure 1. SAR (sodium adsorption ration, unadjusted) vs. Na (sodium concentration, mg/l)

Figure 2. EC (electrical conductivity, uS/cm, dS/m) vs. TDS (total dissolved solids, mg/l)

Figure 3. EC (uS/cm) vs. Na (mg/l)

Figure 4. EC (uS/cm) vs. SAR

Figure 5. Monthly and seasona1 numeric average EC (uS/cm), non-flow weighted

Figure 6. Monthly and seasonal numeric average SAR, non-flow weighted

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