Table 8-3.    Nehalem Water Quality Sampling Site:  Nehalem River at Foley Road (Roy Creek Campground)
Number of data points Impairment
Parameter Evaluation Indicators Historic Mean/Max/Min Collection Date Data Value Minimum Maximum Median > evaluation criteria % exceedence Category
Temp (F) daily max 64 F 54.1/ 67.1/ 41.0 12/10/97 44.6
3/18/98 50.0
7/8/98 67.8
9/16/98 64.9
11/18/98 48.7 Moderately
44.6 67.8 50 2 40% Impaired
Dissolved O2 >8.0 mg/l 10.95/ 12.6/ 8.6 12/10/97 12.5
3/18/98 12.1
7/8/98 10.4
9/16/98 9.4
11/18/98 11.7
9.4 12.5 11.7 0 0% None
pH 6.5 to 8.5 units 7.3/ 7.6/ 7.1 12/10/97 7.5
3/18/98 7.4
7/8/98 7.5
9/16/98 7.5
11/18/98 7.4
7.4 7.5 7.5 0 0% None
Nutrients
    Total Phos <.05 mg/l 0.057/ .390/ .020 12/10/97 0.03
3/18/98 0.02
7/8/98 0.02
9/16/98 0.03
11/18/98 0.02
0.02 0.03 0.03 0 0% None
   Total Nitrate <.30 mg/l 0.437/ 1.00/ .13 12/10/97 0.57
3/18/98 0.50
7/8/98 0.17
9/16/98 0.19
11/18/98 0.84
0.17 0.84 0.5 3 60% Impaired
Bacteria
    E. coli < 406 Ecoli /100 ml   100 (only one 12/10/97 32
        sample) 3/18/98 4
7/8/98 10
9/16/98 60
11/18/98 68
4 68 32 0 0% None
Turbidity 50 NTU max above 5.0/ 6.0/ 4.0 12/10/97 6.0
background 3/18/98 4.0
7/8/98 1.0
9/16/98 3.0
11/18/98 5.0
1.0 6.0 3.0 0 0% None