Mississippi River at Lock and Dam 1 (Agency code: UM 847.7)

Descriptive Statistics of Concentration Data (Milligrams/Liter) 

                  TN_N     NOx_N     NHx_N      TP_P     SRP_P       TSS        Cl
Total obs. =       366       569       856       607       375       576        45
Start date =  01/07/76  01/07/76  01/07/76  01/07/76  03/16/77  01/07/76  05/04/92
End date   =  12/16/96  12/16/96  12/16/96  12/16/96  12/16/96  12/16/96  12/16/96
Mx smp int days=   315        63        64        63       124        63       100
Mean samp int=    21.0      13.5       8.9      12.6      19.3      13.3      38.3
Stdv samp int=    20.7       5.9       4.8       5.9      11.4       5.9      37.9
Mean conc. =      1.44      0.55     0.122     0.102     0.040      17.3      11.0
Stdev conc.=      0.57      0.46     0.139     0.082     0.045      25.5       5.9
Min conc.  =      0.60      0.02     0.020     0.010     0.003       1.0       3.0
25% conc.  =      1.07      0.21     0.020     0.060     0.014       5.0       8.0
Med. conc. =      1.31      0.48     0.080     0.090     0.029      15.0      10.0
75% conc.  =      1.62      0.75     0.170     0.120     0.050      24.0      12.0
Max conc.  =      4.98      3.90     1.500     1.000     0.403     520.0      44.0

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)