Mississippi River above Lock and Dam 3 (Agency code: UM 796.9) 

Descriptive Statistics of Concentration Data (Milligrams/Liter)

                  TN_N     NOx_N     NHx_N      TP_P     SRP_P       TSS        Cl
Total obs. =       359       567       854       603       379       574        45
Start date =  01/06/76  01/06/76  01/06/76  01/06/76  03/17/77  01/06/76  05/06/92
End date   =  12/18/96  12/18/96  12/18/96  12/18/96  12/18/96  12/18/96  12/18/96
Mx smp int days=   312        49        57        49        84        49       103
Mean samp int=    21.4      13.5       9.0      12.7      19.1      13.4      38.3
Stdv samp int=    20.6       5.6       4.5       5.5      10.4       5.6      37.9
Mean conc. =      2.81      1.73     0.312     0.192     0.099      28.8      17.9
Stdev conc.=      1.19      1.27     0.375     0.197     0.080      23.2       5.6
Min conc.  =      0.95      0.05     0.020     0.020     0.005       1.0       2.0
25% conc.  =      2.00      0.80     0.060     0.140     0.062       7.0      15.0
Med. conc. =      2.54      1.40     0.180     0.180     0.090      25.0      17.0
75% conc.  =      3.32      2.28     0.440     0.220     0.120      42.0      20.0
Max conc.  =      9.90      8.50     3.600     4.600     1.190     129.0      32.0

Flow summaries are in the LOADEST2 diagnostic information

TN_N    = Total Nitrogen (as N)
          (Total Kjeldahl Nitrogen + Nitrate + Nitrite)
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 Orthophosphate) 
TSS     = Total Suspended Solids
Cl      = Dissolved Chloride (as Cl)