Mississippi River at Lock and Dam 6 (Agency code: UM-714)

Descriptive Statistics of Concentration Data (Milligrams/Liter) 

                  TN_N     NOx_N     NHx_N      TP_P       TSS        Cl
Total obs. =       116       126       208       198       197        82
Start date =  10/26/81  10/26/81  08/29/62  08/29/62  08/29/62  08/29/62
End date   =  09/21/94  09/19/96  09/19/96  09/21/94  09/21/94  04/08/74
Mx smp int days=   154       399      2758      2758      2758       687
Mean samp int=    41.0      43.5      60.1      59.4      59.8      52.3
Stdv samp int=    25.0      40.5       198       201       202      82.9
Mean conc. =      2.55      1.42     0.186     0.206      23.8       9.5
Stdev conc.=      1.00      0.96     0.152     0.086      16.7       3.5
Min conc.  =      1.19      0.02     0.020     0.070       0.8       1.0
25% conc.  =      1.77      0.75     0.070     0.155      12.0       8.0
Med. conc. =      2.32      1.20     0.190     0.190      22.0       9.5
75% conc.  =      3.13      2.00     0.200     0.240      32.0      11.0
Max conc.  =      5.88      4.40     0.920     0.750     130.0      23.0

Flow summaries are in the LOADEST2 diagnostic information

TN_N    = Total Nitrogen (as N)
          (Total Kjeldahl Nitrogen + Nitrate + Nitrite)
NOx_N   = Nitrate + Nitrite (as N)
NHx_N   = Total Ammonia (as N)
TP_P    = Total Phosphorus (as P)
TSS     = Total Suspended Solids
Cl      = Total Chloride (as Cl)