Table 12. Selected water quality data for the Gasconade River watershed at Phelps County, Hydrologic Unit #10290203, Gage station #06930800 for water years (USGS 1978 - 1998; Code of Regulations 10 CSR 20.7). Mean values are presented with year.
Parmeter State Standard of Uses Water Year (means)
I III VI VII 1978 1983 1988 1998
Water Temperture (oC) 32.2o Max1 28.9o Max2 2.0-28.0 5.0-28.0 2.5-26.0 5.0-25.0
Specific Conductance (us/cm) 264.0- 360.0 264.0- 351.0 240.0- 338.0 277.0- 340.0
O2, Dissolved (mg/l) 5162 6.1-15.8 5.6-12.4 6.8-14.2 6.0-11.8
pH # 7.7-8.3 7.8-8.3 7.9-8.3 7.9-8.2
Hardness, Total (mg/l CaCO3) 160-190 130-190 120-200 150-170
Calcium, Dissolved (mg/l as Ca) 29-39 27-36 24-40 31-34
Magnesium, Dissolved (mg/l as Mg) 19-24 16-23 14-25 17-19
Fluoride, Dissolved (mg/l as Fl) 4 4 <0.1-0.2 <0.1 <0.1-0.2 <0.1
Sulfate, Dissolved (mg/l as SO4) 250 3.9-11 6.3-9.2 5.5-13.0 4.7-7.0
Nitrogen, Total Ammonia (mg/l as NH4) <0.01-0.1 -- <0.01-0.06 --
Nitrate-N (mg/l N) 10 10 .08-.81 .11-.33A .01-.05B
Phosphorus, Total P (mg/l as PO4) .01-.12 .01-.04 <.01-.09 -
Coliform, Fecal (colonies/100ml) 200 4-1900 1-200 1-680 2-180
Streptococci, Fecal (colonies/100ml) 4-1600 21-540 <1-4200 1-77
Iron Dissolved (mg/l FE) 20-30 5-50 <3-10 <10-31

I: Protection of aquatic life. 1 For warm-water fisheries. III: Drinking water supply. 2 For cold-water fisheries. VI: Whole-body-contact recreation. # H2O contaminants should not cause VII: Groundwater pH fall out of 6.5-9.0 range. A1981 water year B1997 water year

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