Mississippi River below Alton, IL (Agency code: 05587550)

Descriptive Statistics of Concentration Data (Milligrams/Liter)

                  TN_N     NOx_N     NHx_N      TP_P     SRP_P       TSS        Cl   SiO2_Si
Total obs. =       119       123        72       125        48       112       125       125
Start date =  01/27/75  01/27/75  10/18/79  01/27/75  11/05/81  01/27/75  01/27/75  01/27/75
End date   =  09/07/89  09/07/89  09/07/89  09/07/89  09/07/89  09/07/89  09/07/89  09/07/89
Mx smp int days=   189        96        76        96        76       253       126       126
Mean samp int=    45.2      43.7      50.9      43.0      60.9      48.1      43.0      43.0
Stdv samp int=    21.2      17.1      16.3      17.1       7.5      29.8      18.4      18.4
Mean conc. =      3.99      2.51     0.157     0.256     0.082     196.9      23.0      3.02
Stdev conc.=      1.71      1.45     0.198     0.139     0.042     254.1       7.5      2.17
Min conc.  =      1.00      0.20     0.000     0.090     0.010       3.0       8.1      0.05
25% conc.  =      2.80      1.50     0.040     0.170     0.050      45.0      18.0      1.40
Med. conc. =      4.00      2.45     0.070     0.220     0.080     103.5      21.0      2.90
75% conc.  =      5.00      3.30     0.200     0.290     0.110     242.5      26.0      4.44
Max conc.  =     11.00     10.00     0.990     0.930     0.210      1310      49.0     16.83

Flow summaries are in the LOADEST2 diagnostic information

TN_N    = Total Nitrogen (as N)
NOx_N   = Total Nitrate + Nitrite (as N)
NHx_N   = Dissolved Ammonia (as N)
TP_P    = Total Phosphorus (as P)
SRP_P   = Soluble Reactive Phosphorus (as P)
          (measured as Dissolved Orthophosphate) 
TSS     = Total Suspended Solids
Cl      = Dissolved Chloride (as Cl)
SiO2_Si = Dissolved Silicon (as Si)
          (Converted from original concentrations measured 
           as Dissolved Silica (as SiO2))