Mississippi River at Thebes, IL (Agency code: 07022000)

Descriptive Statistics of Concentration Data (Milligrams/Liter)

                  TN_N     NOx_N     NHx_N      TP_P     SRP_P       TSS        Cl   SiO2_Si
Total obs. =       251       271       149       263       128       170       208       155
Start date =  07/18/73  07/18/73  11/19/79  01/30/73  07/26/77  01/30/73  01/30/73  01/30/73
End date   =  09/16/93  09/23/93  09/23/93  09/16/93  09/23/93  09/22/92  08/16/93  08/16/93
Mx smp int days=   132       119      1378       119      1378       415       176      1378
Mean samp int=    29.5      27.3      34.2      28.8      46.5      42.5      36.2      48.7
Stdv samp int=    19.7      18.1       118      17.7       173      41.8      18.4       140
Mean conc. =      3.44      2.24     0.100     0.293     0.090     385.9      20.8      3.86
Stdev conc.=      1.45      1.19     0.118     0.147     0.024     356.2       5.5      1.41
Min conc.  =      0.98      0.02     0.000     0.080     0.020      29.0       9.3      0.09
25% conc.  =      2.50      1.30     0.030     0.200     0.070     152.0      17.0      2.94
Med. conc. =      3.30      2.10     0.050     0.250     0.090     271.5      20.0      3.74
75% conc.  =      4.30      2.90     0.130     0.340     0.110     469.0      24.0      4.58
Max conc.  =      9.30      7.10     0.660     1.000     0.140      2320      41.0     10.28

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))