Mississippi River at Keokuk, IA (Agency code: 05474500)

Descriptive Statistics of Concentration Data (Milligrams/Liter)

                  TN_N     NOx_N     NHx_N      TP_P     SRP_P       TSS        Cl   SiO2_Si
Total obs. =        94        99        45        99        23        76       100        96
Start date =  11/04/74  11/04/74  10/01/79  11/04/74  04/27/81  11/04/74  11/04/74  11/04/74
End date   =  09/01/87  09/01/87  08/26/86  09/01/87  08/26/86  09/01/87  09/01/87  08/26/86
Mx smp int days=   252       135       135       135       157       241       135       135
Mean samp int=    50.4      47.8      57.3      47.8      88.5      62.5      47.3      45.4
Stdv samp int=    34.7      27.6      30.6      27.6      24.5      44.8      27.2      26.0
Mean conc. =      3.45      1.98     0.199     0.251     0.082      90.5      16.2      3.19
Stdev conc.=      1.75      1.33     0.222     0.128     0.037     104.6       3.9      1.87
Min conc.  =      0.73      0.03     0.000     0.090     0.000       1.0       8.2      0.05
25% conc.  =      2.30      1.00     0.070     0.170     0.050      23.5      13.3      1.45
Med. conc. =      3.00      1.90     0.110     0.210     0.080      43.5      16.0      3.67
75% conc.  =      4.40      2.90     0.240     0.300     0.110     114.5      18.0      4.51
Max conc.  =     10.00      6.10     0.960     0.960     0.155     424.0      30.0      8.41

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))