St. Croix River from railroad bridge at Hudson, WI (Agency code: SC-17) 

Descriptive Statistics of Concentration Data (Milligrams/Liter)

                  TN_N     NOx_N     NHx_N      TP_P       TSS        Cl
Total obs. =       141       181       281       270       272       112
Start date =  02/28/79  08/27/76  06/28/67  06/28/67  06/28/67  06/28/67
End date   =  09/15/94  09/18/96  09/18/96  09/15/94  09/15/94  09/22/77
Mx smp int days=   154       406       406       154       154       133
Mean samp int=    40.6      40.7      38.1      37.0      36.7      33.7
Stdv samp int=    22.2      34.2      29.1      19.2      19.1      15.5
Mean conc. =      0.97      0.24     0.156     0.107       6.9       4.3
Stdev conc.=      0.26      0.22     0.097     0.476       8.5       2.5
Min conc.  =      0.59      0.01     0.020     0.010       0.5       1.0
25% conc.  =      0.78      0.08     0.090     0.043       3.0       3.0
Med. conc. =      0.93      0.16     0.180     0.060       5.0       4.0
75% conc.  =      1.08      0.38     0.200     0.088       8.0       5.0
Max conc.  =      2.26      1.10     0.930     7.800     100.0      17.0

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)