Mississippi River near Lock & Dam 3 (Agency codes: M796.9N and M796.9M) 

Descriptive Statistics of Concentration Data (Milligrams/Liter)
Statistics are based on mean concentrations for the combined sites
See background information of this site for additional details

                  TN_N     NOx_N     NHx_N      TP_P     SRP_P       TSS        Cl   SiO2_Si
Total obs. =       148       155       155       142       152       119       152       152
Start date =  06/11/91  06/11/91  06/11/91  06/11/91  06/11/91  04/28/93  06/11/91  06/11/91
End date   =  06/03/98  06/19/98  06/19/98  06/03/98  06/19/98  06/19/98  06/19/98  06/19/98
Mx smp int days=    76        76        76        76        76        41        76        76
Mean samp int=    17.3      16.7      16.7      18.1      17.0      15.9      17.0      17.0
Stdv samp int=     8.5       7.1       7.1       9.8       7.5       4.7       7.5       7.5
Mean conc. =      3.33      2.28     0.119     0.165     0.060      35.6      19.1      6.26
Stdev conc.=      1.34      1.04     0.109     0.073     0.044      26.0       7.8      1.78
Min conc.  =      1.40      0.51     0.001     0.027     0.001       1.6       6.5      1.50
25% conc.  =      2.34      1.53     0.044     0.115     0.024       6.1      14.4      5.37
Med. conc. =      3.07      2.09     0.076     0.152     0.051      38.5      18.0      6.46
75% conc.  =      3.99      2.98     0.170     0.205     0.088      56.7      21.9      7.40
Max conc.  =      8.36      5.79     0.442     0.431     0.209     134.6      78.0     14.60

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)
TSS     = Total Suspended Solids
Cl      = Dissolved Chloride (as Cl)
SiO2_Si = Dissolved Silicon (as Si)