Mississippi River above Lock and Dam 2 (Agency code: UM 815.5) 

Descriptive Statistics of Concentration Data (Milligrams/Liter)

                  TN_N     NOx_N     NHx_N      TP_P     SRP_P       TSS        Cl
Total obs. =       362       564       856       592       375       566        43
Start date =  01/06/76  01/06/76  01/06/76  01/06/76  03/15/77  01/06/76  05/05/92
End date   =  12/17/96  12/17/96  12/17/96  12/17/96  12/17/96  12/17/96  12/17/96
Mx smp int days=   312        62        62        62        98        62       173
Mean samp int=    21.2      13.6       8.9      12.9      19.3      13.5      40.2
Stdv samp int=    20.7       6.0       4.8       6.2      11.1       6.0      42.4
Mean conc. =      3.59      2.09     0.515     0.250     0.125      34.9      23.4
Stdev conc.=      1.44      1.50     0.768     0.115     0.065      34.3       8.0
Min conc.  =      1.15      0.04     0.020     0.090     0.009       1.0      11.0
25% conc.  =      2.60      1.00     0.100     0.180     0.080      11.0      17.0
Med. conc. =      3.31      1.75     0.295     0.230     0.118      31.5      22.0
75% conc.  =      4.30      2.84     0.650     0.290     0.160      48.0      29.0
Max conc.  =      9.08     10.18     6.500     0.850     0.341     496.0      46.0

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)